Updated on 2022/07/02

写真a

 
YAMASAKI, Shintaro
 
Affiliation
Faculty of Science and Engineering, Graduate School of Information, Production, and Systems
Job title
Professor

Education

  • 2006.04
    -
    2009.03

    京都大学大学院   工学研究科   航空宇宙工学専攻 博士後期課程  

  • 1997.04
    -
    1999.03

    京都大学大学院   工学研究科   精密工学専攻 修士課程  

  • 1993.04
    -
    1997.03

    Kyoto University   Faculty of Engineering  

Degree

  • 京都大学   修士(工学)

  • 京都大学   博士(工学)

Research Experience

  • 2022.04
    -
    Now

    Waseda University   Graduate School of Information Production and Systems   Professor

  • 2013.01
    -
    2022.03

    大阪大学大学院   工学研究科 機械工学専攻   准教授

  • 2010.04
    -
    2012.12

    Shibaura Institute of Technology   Department of Machinery and Control Systems, College of Systems Engineering and Science

  • 2007.11
    -
    2010.03

    Toyota Central R&D Labs., Inc.

Professional Memberships

  • 　
    　
    　

    日本設計工学会

  • 　
    　
    　

    電子情報通信学会

  • 　
    　
    　

    日本計算工学会

  • 　
    　
    　

    日本機械学会

  • 　
    　
    　

    JAPAN SOCIETY FOR SIMULATION TECHNOLOGY

 

Research Areas

  • Design engineering

  • Computational science

  • Machine elements and tribology

Research Interests

  • Integrated devices

  • 機械学習

  • データサイエンス

  • トポロジー最適化

  • 構造最適化

  • 最適設計

▼display all

Papers

  • Data-driven multifidelity topology design using a deep generative model: Application to forced convection heat transfer problems

    Kentaro Yaji, Shintaro Yamasaki, Kikuo Fujita

    Computer Methods in Applied Mechanics and Engineering   388   114284 - 114284  2022.01

    DOI

  • Data-driven topology design using a deep generative model

    Shintaro Yamasaki, Kentaro Yaji, Kikuo Fujita

    Structural and Multidisciplinary Optimization   64 ( 3 ) 1401 - 1420  2021.09  [Refereed]

    Authorship：Lead author, Corresponding author

    　View Summary

    <title>Abstract</title>In this paper, we propose a sensitivity-free and multi-objective structural design methodology called <italic>data-driven topology design</italic>. It is schemed to obtain high-performance material distributions from initially given material distributions in a given design domain. Its basic idea is to iterate the following processes: (i) selecting material distributions from a dataset of material distributions according to eliteness, (ii) generating new material distributions using a deep generative model trained with the selected elite material distributions, and (iii) merging the generated material distributions with the dataset. Because of the nature of a deep generative model, the generated material distributions are diverse and inherit features of the training data, that is, the elite material distributions. Therefore, it is expected that some of the generated material distributions are superior to the current elite material distributions, and by merging the generated material distributions with the dataset, the performances of the newly selected elite material distributions are improved. The performances are further improved by iterating the above processes. The usefulness of data-driven topology design is demonstrated through numerical examples.

    DOI

  • Three-dimensional topology optimization model to simulate the external shapes of bone.

    Misaki Sakashita, Shintaro Yamasaki, Kentaro Yaji, Atsushi Kawamoto, Shigeru Kondo

    PLoS computational biology   17 ( 6 ) e1009043  2021.06  [Refereed]  [International journal]

    　View Summary

    Elucidation of the mechanism by which the shape of bones is formed is essential for understanding vertebrate development. Bones support the body of vertebrates by withstanding external loads, such as those imposed by gravity and muscle tension. Many studies have reported that bone formation varies in response to external loads. An increased external load induces bone synthesis, whereas a decreased external load induces bone resorption. This relationship led to the hypothesis that bone shape adapts to external load. In fact, by simulating this relationship through topology optimization, the internal trabecular structure of bones can be successfully reproduced, thereby facilitating the study of bone diseases. In contrast, there have been few attempts to simulate the external structure of bones, which determines vertebrate morphology. However, the external shape of bones may be reproduced through topology optimization because cells of the same type form both the internal and external structures of bones. Here, we constructed a three-dimensional topology optimization model to attempt the reproduction of the external shape of teleost vertebrae. In teleosts, the internal structure of the vertebral bodies is invariable, exhibiting an hourglass shape, whereas the lateral structure supporting the internal structure differs among species. Based on the anatomical observations, we applied different external loads to the hourglass-shaped part. The simulations produced a variety of three-dimensional structures, some of which exhibited several structural features similar to those of actual teleost vertebrae. In addition, by adjusting the geometric parameters, such as the width of the hourglass shape, we reproduced the variation in the teleost vertebrae shapes. These results suggest that a simulation using topology optimization can successfully reproduce the external shapes of teleost vertebrae. By applying our topology optimization model to various bones of vertebrates, we can understand how the external shape of bones adapts to external loads.

    DOI PubMed

  • Topology design of two-fluid heat exchange

    Hiroki Kobayashi, Kentaro Yaji, Shintaro Yamasaki, Kikuo Fujita

    Structural and Multidisciplinary Optimization   63 ( 2 ) 821 - 834  2021.02  [Refereed]

    　View Summary

    <title>Abstract</title>Heat exchangers are devices that typically transfer heat between two fluids. The performance of a heat exchanger such as heat transfer rate and pressure loss strongly depends on the flow regime in the heat transfer system. In this paper, we present a density-based topology optimization method for a two-fluid heat exchange system, which achieves a maximum heat transfer rate under fixed pressure loss. We propose a representation model accounting for three states, i.e., two fluids and a solid wall between the two fluids, by using a single design variable field. The key aspect of the proposed model is that mixing of the two fluids can be essentially prevented. This is because the solid constantly exists between the two fluids due to the use of the single design variable field. We demonstrate the effectiveness of the proposed method through three-dimensional numerical examples in which an optimized design is compared with a simple reference design, and the effects of design conditions (i.e., Reynolds number, Prandtl number, design domain size, and flow arrangements) are investigated.

    DOI

  • Layout Design of Components and Conductors in Noise Filter by Integrative Optimization of Structural Topology and External Variables

    MARUYAMA Shun, YAMASAKI Shintaro, NOMURA Katsuya, YAJI Kentaro, FUJITA Kikuo

    Transactions of the Japan Society for Computational Engineering and Science   2021   20210007 - 20210007  2021  [Refereed]

    Authorship：Corresponding author

    　View Summary

    <p>This paper presents a layout design method of a noise filter that simultaneously optimizes an arrangement of electrical components and a conductor pattern. A conductor design method has been proposed based on topology optimization, but its solutions are limited to sub-optimal under the viewpoint of overall optimality, because the arrangement of components is treated as a given condition. For integratively optimizing both of them, this study extends a topology optimization framework incorporating external variables with metamodeling, where the external variables correspond to the arrangement of components. A face-centered cubic design and sequential addition of samples are introduced to efficiently perform its metamodeling even under large number of external variables. Two numerical examples of noise filter design problems are demonstrated, and their results show that the integrative optimization significantly improves the filter performance as compared with non-integrative optimization.</p>

    DOI CiNii

  • Variational Deep Embedding Mines Concepts from Comprehensive Optimal Designs

    K. Minowa, K. Fujita, Y. Nomaguchi, S. Yamasaki, K. Yaji

    Proceedings of Ninth International Conference on Design Computing and Cognition     667 - 678  2020.12  [Refereed]

  • Topology optimization incorporating external variables with metamodeling

    Shun Maruyama, Shintaro Yamasaki, Kentaro Yaji, Kikuo Fujita

    Structural and Multidisciplinary Optimization   62 ( 5 ) 2455 - 2466  2020.11  [Refereed]

    　View Summary

    <title>Abstract</title>
    The objective of conventional topology optimization is to optimize the material distribution for a prescribed design domain. However, solving the topology optimization problem strongly depends on the settings specified by the designer for the shape of the design domain or their specification of the boundary conditions. This contradiction indicates that the improvement of structures should be achieved by optimizing not only the material distribution but also the additional design variables that specify the above settings. We refer to the additional design variables as external variables. This paper presents our work relating to solving the design problem of topology optimization incorporating external variables. The approach we follow is to formulate the design problem as a multi-level optimization problem by focusing on the dominance-dependence relationship between external variables and material distribution. We propose a framework to solve the optimization problem utilizing the multi-level formulation and metamodeling. The metamodel approximates the relationship between the external variables and the performance of the corresponding optimized material distribution. The effectiveness of the framework is demonstrated by presenting three examples.

    DOI

  • Multi-fidelity design guided by topology optimization

    Kentaro Yaji, Shintaro Yamasaki, Kikuo Fujita

    Structural and Multidisciplinary Optimization    2020.03  [Refereed]

  • Computational design of flow fields for vanadium redox flow batteries via topology optimization

    Chen C. H, Yaji K, Yamasaki S, Tsushima S, Fujita K

    Journal of Energy Storage    2019.11  [Refereed]

  • Freeform winglet design of fin-and-tube heat exchangers guided by topology optimization

    Kobayashi H, Yaji K, Yamasaki S, Fujita K

    Applied Thermal Engineering   161   114020  2019.10  [Refereed]

  • Formulation support system for topology optimization based on knowledge discovery in databases

    Shintaro Yamasaki

       2019.09  [Invited]

  • 設計条件の最小表現のもとでの網羅的なトポロジー最適化による橋梁構造のコンセプト探査

    蓑輪和生, 錦見健太郎, 山﨑慎太郎, 矢地謙太郎, 野間口大, 藤田喜久雄

    日本機械学会第29回設計工学・システム部門講演会講演論文集   2019  2019.09

  • A framework of multi-fidelity topology design and its application to optimum design of flow fields in battery systems

    Yaji K, Yamasaki S, Tsushima S, Fujita K

    Proceedings of ASME 2019 International Design Engineering Technical Conferences & Computers and Information in Engineering Conference   ( IDETC2019-97675 )  2019.08  [Refereed]

  • トポロジー最適化を用いたノイズフィルタにおける支配的なノイズの低減

    野村勝也, 高橋篤弘, 小島崇, 山崎慎太郎, 矢地謙太郎, 坊大貴, 藤田喜久雄

    電子情報通信学会論文誌B   J102-B ( 8 ) 669 - 673  2019.08  [Refereed]

  • Topology optimization of conductors in electrical circuit

    Nomura K, Yamasaki S, Yaji K, Bo H, Takahashi A, Kojima T, Fujita K

    Structural and Multidisciplinary Optimization   59 ( 6 ) 2205 - 2225  2019.06  [Refereed]

  • Topologyoptimization-based conductor pattern design for inductance cancellation structure to reduce common- and differential-mode noise

    Nomura K, Takahashi A, Kojima T, Yamasaki S, Yaji K, Bo H, Fujita K

    Proceedings of the Applied Power Electronics Conference and Exposition 2019   ( 1269 )  2019.03  [Refereed]

  • Knowledge discovery in databases for determining formulation in topology optimization

    Yamasaki S, Yaji K, Fujita K

    Structural and Multidisciplinary Optimization   59 ( 2 ) 595 - 611  2019.02  [Refereed]

    Authorship：Lead author, Corresponding author

  • Production of the different shapes of the vertebral bodies among teleost fish species by the mathematical model using topology optimization

    SAKASHITA Misaki, YAMASAKI Shintaro, YAJI Kentaro, KONDO Shigeru

    The Proceedings of Design & Systems Conference   2019   2108 - 2108  2019

    　View Summary

    <p>We aim to understand the mechanism that forms the shapes of bones. Biological studies suggest that bone morphology is adapted to the external loads. To explain how the external loads affect bone morphogenesis, the mathematical models have been developed using topology optimization. Using these mathematical models, the structure like trabeculae can be generated. However, the formation of external shapes of bones has rarely been studied. Because the inner structure and the external shape of bones are formed by the same types of cells, we hypothesize that the formation of external shape also depends on the external loads and can be explained by topology optimization. The vertebral body of fish we focus on exhibits the various shapes and its morphology seems to be closely related to the swimming mode of fish. To reveal the relationship between the vertebral shapes and the external loads, we built a mathematical model using topology optimization. By setting the different loadings expected to occur during swimming of fish, the model can produce the shapes similar to the vertebral bodies of the different species. Numerical results suggest that the external load is one of the main factors to determine the shape of vertebral bodies of teleost fish. Also, this mathematical model enables us to discuss what external load is important to form each vertebral shape of the different species.</p>

    DOI CiNii

  • 設計代替案集合からのニューラルネットワークによる設計コンセプトの抽出に関する基礎的研究

    錦見健太郎, 鬼塚舞, 野間口大, 山﨑慎太郎, 矢地謙太郎, 藤田喜久雄

    日本機械学会第28回設計工学・システム部門講演会講演論文集     3401  2018.11

  • Doping profile optimization for power devices using topology optimization

    Nomura K, Kondoh T, Ishikawa T, Yamasaki S, Yaji K, Fujita K

    IEEE Transactions on Electron Devices   65 ( 9 ) 3869 - 3877  2018.09  [Refereed]

  • Topology design via physics-based surrogate optimization for turbulent heat transfer problem

    Yaji K, Yamasaki S, Fujita K

    Proceedings of Asian Congress of Structural and Multidisciplinary Optimization 2018   ( A020167 )  2018.05  [Refereed]

  • Topology optimization for the design of flow fields in a redox flow battery

    Kentaro Yaji, Shintaro Yamasaki, Shohji Tsushima, Takahiro Suzuki, Kikuo Fujita

    Structural and Multidisciplinary Optimization   57 ( 2 ) 535 - 546  2018.02  [Refereed]

    　View Summary

    This paper presents topology optimization for the design of flow fields in vanadium redox flow batteries (VRFBs), which are large-scale storage systems for renewable energy resources such as solar and wind power. It is widely known that, in recent VRFB systems, one of the key factors in boosting charging or discharging efficiency is the design of the flow field around carbon fiber electrodes and in flow channels. In this study, topology optimization is applied in order to achieve optimized flow field designs. The optimization problem is formulated as a maximization problem for the generation rate of the vanadium species governed by a simplified electrochemical reaction model. A typical porous model is incorporated into the optimization problem for expressing the carbon fiber electrode
    furthermore, a mass transfer coefficient that depends on local velocity is introduced. We investigate the dependencies of the optimized configuration with respect to the porosity of the porous electrode and the pressure loss. Results indicate that patterns of interdigitated flow fields are valid designs for VRFBs.

    DOI

  • 永久磁石の配置とヨークの構造形態を考慮した同期モータの最適設計法

    丸山峻, 山崎慎太郎, 矢地謙太郎, 藤田喜久雄

    設計工学   53 ( 1 ) 97 - 110  2018.01  [Refereed]

  • Three-dimensional grayscale-free topology optimization using a level-set based r-refinement method

    Shintaro Yamasaki, Seiichiro Yamanaka, Kikuo Fujita

    INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING   112 ( 10 ) 1402 - 1438  2017.12  [Refereed]

    Authorship：Lead author, Corresponding author

    　View Summary

    In this paper, we propose a three-dimensional (3D) grayscale-free topology optimization method using a conforming mesh to the structural boundary, which is represented by the level-set method. The conforming mesh is generated in an r-refinement manner; that is, it is generated by moving the nodes of the Eulerian mesh that maintains the level-set function. Although the r-refinement approach for the conforming mesh generation has many benefits from an implementation aspect, it has been considered as a difficult task to stably generate 3D conforming meshes in the r-refinement manner. To resolve this task, we propose a new level-set based r-refinement method. Its main novelty is a procedure for minimizing the number of the collapsed elements whose nodes are moved to the structural boundary in the conforming mesh; in addition, we propose a new procedure for improving the quality of the conforming mesh, which is inspired by Laplacian smoothing. Because of these novelties, the proposed r-refinement method can generate 3D conforming meshes at a satisfactory level, and 3D grayscale-free topology optimization is realized. The usefulness of the proposed 3D grayscale-free topology optimization method is confirmed through several numerical examples. Copyright (C) 2017 John Wiley & Sons, Ltd.

    DOI

  • 陽的縮約に基づくマルチフィデリティ解析モデルによる複合領域配置設計最適化法 ( 放熱特性を考慮した配置設計問題への適用 )

    山内仁史, 山崎慎太郎, 矢地謙太郎, 藤田喜久雄

    日本機械学会論文集   83 ( 855 ) 17-00320 - 17-00320  2017.11  [Refereed]

    Authorship：Corresponding author

  • トポロジー最適化における設計条件と設計解の多様性に関する一考察

    山﨑 慎太郎, 錦見 健太郎, 矢地 謙太郎, 野間口 大, 藤田喜久雄

    日本機械学会第27回設計工学・システム部門講演会講演論文集    2017.09

  • Conductor layout optimization for reducing the magnetic coupling noise of a filter circuit board

    Bo H, Yamasaki S, Yaji K, Nomura K, Takahashi A, Fujita K

    Proceedings of 12th World Congress on Structural and Multidisciplinary Optimization   ( 412 )  2017.06  [Refereed]

  • Integrated design of permanent magnet synchronous motor by incorporating magnet layout and yoke topology optimizations

    Maruyama S, Yamasaki S, Yaji K, Fujita K

    Proceedings of 12th World Congress on Structural and Multidisciplinary Optimization   ( 418 )  2017.06  [Refereed]

  • Topology optimization of power semiconductor devices

    Nomura K, KondohT, Ishikawa T, Yamasaki S, Yaji K, Fujita K

    Proceedings of 12th World Congress on Structural and Multidisciplinary Optimization   ( 406 )  2017.06  [Refereed]

  • Knowledge discovery in dataset generated by topology optimization

    Yamasaki S, Yaji K, Fujita K

    Proceedings of 12th World Congress on Structural and Multidisciplinary Optimization   ( 428 )  2017.06  [Refereed]

  • Optimum channel design of a redox flow battery via topology optimization

    K. Yaji, S. Yamasaki, S. Tsushima, T. Suzuki, K. Fujita

       2017.06

  • Estimation of measurement errors in orthotropic elastic moduli determined from natural frequencies

    Akira Saito, Atsushi Kawamoto, Masakatsu Kuroishi, Hideo Nakai, Shintaro Yamasaki

    STRUCTURAL AND MULTIDISCIPLINARY OPTIMIZATION   55 ( 3 ) 987 - 999  2017.03  [Refereed]

    　View Summary

    Orthotropic elastic moduli of composite structures can be identified by nonlinear least squares fit between measured and computed natural frequencies. However, due to measurement errors contained in the measured natural frequencies and mode shapes, the process of elastic moduli identification is error-prone. This paper proposes an efficient method to estimate the errors in the elastic moduli caused by the measurement errors in the natural frequencies. The method utilizes an efficient semi-analytic expression of the sensitivities of the eigenvalues with respect to the orthotropic elastic moduli. First, the first-order approximation of the analytic sensitivity of orthotropic elastic moduli with respect to the measurement errors is introduced. The approximation is then used to estimate the variability of the identified elastic moduli due to the measurement errors. It is shown that the aspect ratio of the test specimen greatly affects the standard deviation of the identified elastic moduli. Second, using the first-order approximation, the effects of aspect ratio of the test specimen as well as the values of the elastic moduli are further investigated. Based on the results of numerical experiments, guidelines for the dimension of the test specimen for the elastic moduli identification are proposed.

    DOI

  • Grayscale-free topology optimization for electromagnetic design problem of in-vehicle reactor

    Shintaro Yamasaki, Atsushi Kawamoto, Akira Saito, Masakatsu Kuroishi, Kikuo Fujita

    STRUCTURAL AND MULTIDISCIPLINARY OPTIMIZATION   55 ( 3 ) 1079 - 1090  2017.03  [Refereed]

    　View Summary

    In this paper, we propose grayscale-free topology optimization for a reactor design problem where the electromagnetic performance needs to be optimized. A reactor is an electric device to boost electric voltage, and is used as a part of a DC-DC converter in electric and hybrid vehicles. When designing reactors, we need to consider many performance indicators such as inductance and fringing loss. In general, high-performance reactor design that satisfies all requirements is not obvious, and topology optimization is promising for such non-trivial design problems. In this paper, we therefore establish a framework for the electromagnetic design of an in-vehicle reactor on the basis of boundary tracking type level-set topology optimization, which realizes grayscale-free topology optimization. Because of its grayscale-free characteristic, the established framework can completely resolve the numerical problems caused by the so-called grayscale elements. We present several numerical examples to demonstrate the usefulness of the established framework, and we discuss the possibilities for the expansion of the established framework to more difficult and valuable design problems.

    DOI

  • 非線形磁気特性を考慮したハイブリッド車用高出力モーターのトポロジー最適化

    丸山峻, 山崎慎太郎, 矢地謙太郎, 藤田喜久雄

       2016.12

  • 電磁応力の領域積分に基づく磁場・構造連成問題を対象としたグレースケールフリートポロジー最適化法

    大西遼, 山崎慎太郎, 川本敦史, 齋藤彰, 黒石真且, 藤田喜久雄

       2016.10

  • Equivalent orthotropic elastic moduli identification method for laminated electrical steel sheets

    Akira Saito, Yasunari Nishikawa, Shintaro Yamasaki, Kikuo Fujita, Atsushi Kawamoto, Masakatsu Kuroishi, Hideo Nakai

    MECHANICAL SYSTEMS AND SIGNAL PROCESSING   72-73   607 - 628  2016.05  [Refereed]

    　View Summary

    In this paper, a combined numerical-experimental methodology for the identification of elastic moduli of orthotropic media is presented. Special attention is given to the laminated electrical steel sheets, which are modeled as orthotropic media with nine independent engineering elastic moduli. The elastic moduli are determined specifically for use with finite element vibration analyses. We propose a three-step methodology based on a conventional nonlinear least squares fit between measured and computed natural frequencies. The methodology consists of: (1) successive augmentations of the objective function by increasing the number of modes, (2) initial condition updates, and (3) appropriate selection of the natural frequencies based on their sensitivities on the elastic moduli. Using the results of numerical experiments, it is shown that the proposed method achieves more accurate converged solution than a conventional approach. Finally, the proposed method is applied to measured natural frequencies and mode shapes of the laminated electrical steel sheets. It is shown that the method can successfully identify the orthotropic elastic moduli that can reproduce the measured natural frequencies and frequency response functions by using finite element analyses with a reasonable accuracy. (C) 2015 Elsevier Ltd. All rights reserved.

    DOI

  • Elastic moduli identification method for orthotropic structures based on vibration data

    Saito A, Nishikawa Y, Yamasaki S, Fujita K, Kawamoto A, Kuroishi M, Nakai H

    Proceedings of 11th World Congress on Structural and Multidisciplinary Optimization   ( 1208 )  2015.06  [Refereed]

  • Applications of a consistent grayscale-free topology optimization method to industrial design problems

    Yamasaki S, Kawamoto A, Nomura T, Fujita K

    Proceedings of 11th World Congress on Structural and Multidisciplinary Optimization   ( 1297 )  2015.06  [Refereed]

  • A consistent grayscale-free topology optimization method using the level-set method and zero-level boundary tracking mesh

    Shintaro Yamasaki, Atsushi Kawamoto, Tsuyoshi Nomura, Kikuo Fujita

    INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING   101 ( 10 ) 744 - 773  2015.03  [Refereed]

    　View Summary

    This paper proposes a level-set based topology optimization method incorporating a boundary tracking mesh generating method and nonlinear programming. Because the boundary tracking mesh is always conformed to the structural boundary, good approximation to the boundary is maintained during optimization; therefore, structural design problems are solved completely without grayscale material. Previously, we introduced the boundary tracking mesh generating method into level-set based topology optimization and updated the design variables by solving the level-set equation. In order to adapt our previous method to general structural optimization frameworks, the incorporation of the method with nonlinear programming is investigated in this paper. To successfully incorporate nonlinear programming, the optimization problem is regularized using a double-well potential. Furthermore, the sensitivities with respect to the design variables are strictly derived to maintain consistency in mathematical programming. We expect the investigation to open up a new class of grayscale-free topology optimization. The usefulness of the proposed method is demonstrated using several numerical examples targeting two-dimensional compliant mechanism and metallic waveguide design problems. Copyright (c) 2014 John Wiley & Sons, Ltd.

    DOI

  • Driving force profile design in comb drive electrostatic actuators using a level set-based shape optimization method

    Takayo Kotani, Takayuki Yamada, Shintaro Yamasaki, Makoto Ohkado, Kazuhiro Izui, Shinji Nishiwaki

    STRUCTURAL AND MULTIDISCIPLINARY OPTIMIZATION   51 ( 2 ) 369 - 383  2015.02  [Refereed]

    　View Summary

    Electrostatic actuators, actuators actuated by electrostatic forces, are now widely used as sensors and switches, especially in Micro-Electro-Mechanical Systems (MEMS). Among different kinds of electrostatic actuators, the comb drive type is one of the most popular because it has a relatively large range of displacement. In design problems for electrostatic actuators, the driving force profile is of primary engineering importance. In this paper, we develop a structural optimization method for comb drive electrostatic actuators that achieves prescribed driving force profiles, based on a level set-based shape optimization method that provides optimal configurations with clear boundaries, solutions that are valid in an engineering sense. Accurate calculation of the electrostatic forces that occur on the structural boundaries during optimization is important for developing actuators that operate with prescribed driving forces. In the conventional level set-based shape optimization methods, inaccuracies in the calculation of these electrostatic forces occur because the structural boundaries are seldom aligned with the finite element method (FEM) nodes. To precisely calculate the electrostatic forces, we developed a mesh adaptation scheme by which the finite element nodes are brought into alignment with the structural boundaries at every iteration of the optimization procedure. In the following, we explain the details of the proposed level set-based shape optimization method, in which a multi-objective optimization problem is formulated to achieve a prescribed driving force profile. The sensitivity is derived using the adjoint variable method. Four numerical examples are provided, to examine the suitability of the proposed optimization method.

    DOI

  • General topology optimization method with continuous and discrete orientation design using isoparametric projection

    Tsuyoshi Nomura, Ercan M. Dede, Jaewook Lee, Shintaro Yamasaki, Tadayoshi Matsumori, Atsushi Kawamoto, Noboru Kikuchi

    INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING   101 ( 8 ) 571 - 605  2015.02  [Refereed]

    　View Summary

    A general topology optimization method, which is capable of simultaneous design of density and orientation of anisotropic material, is proposed by introducing orientation design variables in addition to the density design variable. In this work, the Cartesian components of the orientation vector are utilized as the orientation design variables. The proposed method supports continuous orientation design, which is out of the scope of discrete material optimization approaches, as well as design using discrete angle sets. The advantage of this approach is that vector element representation is less likely to fail into local optima because it depends less on designs of former steps, especially compared with using the angle as a design variable (Continuous Fiber Angle Optimization) by providing a flexible path from one angle to another with relaxation of orientation design space. An additional advantage is that it is compatible with various projection or filtering methods such as sensitivity filters and density filters because it is free from unphysical bound or discontinuity such as the one at theta = 2 pi and theta = 0 seen with direct angle representation. One complication of Cartesian component representation is the point-wise quadratic bound of the design variables; that is, each pair of element values has to reside in a given circular bound. To overcome this issue, we propose an isoparametric projection method, which transforms box bounds into circular bounds by a coordinate transformation with isoparametric shape functions without having the singular point that is seen at the origin with polar coordinate representation. A new topology optimization method is built by taking advantage of the aforementioned features and modern topology optimization techniques. Several numerical examples are provided to demonstrate its capability. Copyright (C) 2014 John Wiley & Sons, Ltd.

    DOI

  • Hierarchical Optimization-Based Approach for Two-Dimensional Rectangular Layout Design Problems

    Kikuo Fujita, Shintaro Yamasaki, Masayuki Kawamoto

    JOURNAL OF COMPUTING AND INFORMATION SCIENCE IN ENGINEERING   14 ( 4 ) 41006  2014.12  [Refereed]

    　View Summary

    In this study, we propose a hierarchical optimization-based approach for two-dimensional rectangular layout design problems. Decomposition-based optimization has been a key approach for complicated design problems in multidisciplinary design optimization (MDO), but the main focus has been design problems where the design variables are continuous. On the other hand, various approaches have been developed for layout design based on evolutionary algorithms, e. g., simulated annealing (SA) and genetic algorithms (GAs) which can handle its combinatorial nature in an effective manner. In the present study, we aim to introduce a new paradigm by combining decomposition-based optimization and evolutionary algorithms for solving complicated layout design problems. In this approach, the original layout problem is decomposed into the top-level layout problem and a set of sublevel layout problems, where the layouts obtained from the sublevel problems are used as components of the top-level problem. Since the preferable shapes of these components are unclear when the sublevel problems are solved, a set of Pareto optima are provided in the sublevel problems and these solutions are used as candidate components in the top-level problem. A computational design algorithm is developed based on this approach, which represents the layout topology with sequence pair and the shape of each subsystem or component with the aspect ratio, and they are optimized using GAs. The Pareto optimality of the sublevels is handled by multi-objective GAs, and a set of Pareto optima is generated simultaneously. The top-level and sublevel layout problems are coordinated via the exchange of preferable ranges for the shapes and layout. This approach was implemented and applied to an example problem to demonstrate its performance and capability.

    DOI

  • A level set-based topology optimization incorporating arbitrary Lagrangian Eulerian method for wavelength filter using extraordinary optical transmission

    Makoto Ohkado, Tsuyoshi Nomura, Shintaro Yamasaki, Atsushi Kawamoto, Shinji Nishiwaki

    STRUCTURAL AND MULTIDISCIPLINARY OPTIMIZATION   50 ( 3 ) 465 - 474  2014.09  [Refereed]

    　View Summary

    This paper deals with structural optimization for designing periodic structures in a hole array wavelength filter. The hole array wavelength filter that consists of metallic thin film and dielectric enables to transmit narrow bandwidth light. It is known that transmission spectrum can be changed not only by the periodicity of hole array but also by the shape of holes. For optimizing the hole shape, the level set method is used in this study. In the ordinary level set method, the boundaries are implicitly expressed by the zero level set of a scalar function, called the level set function, within a fixed mesh. Therefore, the material interpolation becomes numerically awkward within the elements across the implicit zero level set because those elements inevitably take on intermediate material properties even if the boundary of zero level set are mathematically clear. As the result, the optimization is likely to yield wrong solution. Here, a new level set optimization method incorporating Arbitrary Lagrangian Eulerian method is proposed to eliminate intermediate values on the interfaces perfectly. As a result, the proposed method can successfully perform the structural optimization of hole shape without intermediate values.

    DOI

  • Electromagnetic design of invehicle reactor using a level-set based topology optimization method

    Yamasaki S, Kawamoto A, Saito A, Kuroishi M, Fujita K

    Proceedings of ASME 2014 International Design & Engineering Technical Conferences and Computers & Information in Engineering Conference   ( DETC2014-34345 )  2014.08  [Refereed]

  • Compliant mechanism design based on boundary element immersing type level-set topology optimization

    Yamasaki S, Fujita K

    Proceedings of 8th China-Japan-Korea Joint Symposium on Optimization of Structural and Mechanical Systems   ( T3A-1-118 )  2014.05  [Refereed]

  • 2212 Consideration concerning a regularization technique used in boundary tracking type level-set topology optimization

    YAMASAKI Shintaro, FUJITA Kikuo

    Proceedings of the Optimization Symposium   2014   _2212 - 1_-_2212-5_  2014

    　View Summary

    In this paper, we proposed a regularization technique for boundary tracking type level-set topology optimization. This new regularization technique is based on the double-well potential and it realizes smooth convergence in boundary tracking type level-set topology optimization. Because of this regularization technique, boundary tracking type level-set topology optimization is well incorporated with the mathematical programming framework. The usefulness of the proposed regularization technique is demonstrated by solving two numerical examples.

    DOI CiNii

  • モデルベース開発とプロトタイピングの省察的相互作用についての設計実験

    戸田康太郎, 水田将史, 野間口大, 山﨑慎太郎, 藤田喜久雄

    日本機械学会第23回設計工学・システム部門講演会講演論文集    2013.10

  • レベルセット法に基づく静電アクチュエータの構造最適化

    小谷高代, 山崎慎太郎, 山田崇恭, 大門真, 泉井一浩, 西脇眞二

    日本機械学会論文集（C編）   79 ( 805 ) 3234 - 3247  2013.09  [Refereed]

  • Level-set and ALE based topology optimization using nonlinear programming

    Yamasaki S, Kawamoto A, Nomura T

    Proceedings of 10th World Congress on Structural and Multidisciplinary Optimization   ( 5190 )  2013.05  [Refereed]

  • An immersed boundary element method for level-set based topology optimization

    Yamasaki S, Yamada T, Matsumoto T

    International Journal for Numerical Methods in Engineering   93 ( 9 ) 960 - 988  2013.03  [Refereed]

  • Topology optimization by a time-dependent diffusion equation

    A. Kawamoto, T. Matsumori, T. Nomura, T. Kondoh, S. Yamasaki, S. Nishiwaki

    INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING   93 ( 8 ) 795 - 817  2013.02  [Refereed]

    　View Summary

    Most topology optimization problems are formulated as constrained optimization problems; thus, mathematical programming has been the mainstream. On the other hand, solving topology optimization problems using time evolution equations, seen in the level set-based and the phase field-based methods, is yet another approach. One issue is the treatment of multiple constraints, which is difficult to incorporate within time evolution equations. Another issue is the extra re-initialization steps that interrupt the time integration from time to time. This paper proposes a way to describe, using a Heaviside projection-based representation, a time-dependent diffusion equation that addresses these two issues. The constraints are treated using a modified augmented Lagrangian approach in which the Lagrange multipliers are updated by simple ordinary differential equations. The proposed method is easy to implement using a high-level finite element code. Also, it is very practical in the sense that one can fully utilize the existing framework of the code: GUI, parallelized solvers, animations, data imports/exports, and so on. The effectiveness of the proposed method is demonstrated through numerical examples in both the planar and spatial cases. Copyright (c) 2012 John Wiley & Sons, Ltd.

    DOI

  • Functional mechanism design using a boundary tracking type level-set topology optimization method

    Yamasaki Shintaro, Kawamoto Atsushi, Nomura Tsuyoshi, Fujita Kikuo

    Proceedings of JSPE Semestrial Meeting   2013   707 - 708  2013

    DOI CiNii

  • Structural optimization of electrostatic actuators based on the level set method

    Takayo Kotani, Shintaro Yamasaki, Takayuki Yamada, Makoto Ohkado, Kazuhiro Izui, Shinji Nishiwaki

    Nihon Kikai Gakkai Ronbunshu, C Hen/Transactions of the Japan Society of Mechanical Engineers, Part C   79 ( 805 ) 3234 - 3247  2013  [Refereed]

    　View Summary

    This paper presents a level set-based structural optimization method for electrostatic actuator problems. Electrostatic actuators are electromechanical systems that are actuated by electrostatic forces. The development of MEMS (Micro Electro Mechanical Systems) device production techniques has spurred widespread deployment of small-sized electrostatic actuators. This paper proposes a level set-based structural optimization method for electrostatic actuators that provides optimal configurations with clear boundaries. The main difficulty when applying a level set-based structural optimization method to electrostatic actuator design problems is the calculation of actuation forces, because these appear on structural boundaries that move during the optimization. Thus, the nodes of the finite element mesh may be displaced from the level set boundaries, causing inaccuracies. To accurately calculate the actuation forces on these surfaces, we develop an adaptive meshing scheme so that the nodes closest to the structural boundaries snap to the boundaries after each update of level set function. In our study, the electrostatic and elastic displacement fields are coupled. The sensitivity is derived using the adjoint variable method, and Maxwell's stress tensor is used to calculate actuation forces. We provide two numerical examples to verify the effectiveness of our proposed method. © 2013 The Japan Society of Mechanical Engineers.

    DOI

  • Level set-based topology optimization using an immersed boundary element method

    Yamasaki S, Yamada T, Matsumoto T

    Proceedings of 6th European Congress on Computational Methods in Applied Sciences and Engineering   ( 3206 )  2012.09  [Refereed]

  • Compliant mechanism design based on the level set and arbitrary Lagrangian Eulerian methods

    Shintaro Yamasaki, Atsushi Kawamoto, Tsuyoshi Nomura

    STRUCTURAL AND MULTIDISCIPLINARY OPTIMIZATION   46 ( 3 ) 343 - 354  2012.09  [Refereed]

    　View Summary

    This paper deals with continuum-based compliant mechanism design. In topology optimization, filtering techniques are used for the regularization of the design space. In the density design representation, convolution-type filters inherently produce gray transition regions between solids and voids. In order to reduce the gray transition regions, projection schemes have recently been proposed. Binarization, however, still leads to one-node connected hinges in compliant mechanism design. In this paper, we propose a method that incorporates the level set and arbitrary Lagrangian Eulerian methods so that the gray transition regions are completely excluded and one-node connected hinges are not formed.

    DOI

  • レベルセット法による導波管H面回路の導体形状最適設計

    仲祐輔, 平山浩一, 安井崇, 佐藤慎吾, 辻寧英, 山崎慎太郎, 西脇眞二

    電子情報通信学会論文誌C   J95-C ( 7 ) 139 - 143  2012.07  [Refereed]

  • Level set-based topology optimization targeting dielectric resonator-based composite right- and left-handed transmission lines

    Shintaro Yamasaki, Tsuyoshi Nomura, Kazuo Sato, Naobumi Michishita, Yoshihide Yamada, Atsushi Kawamoto

    INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING   89 ( 10 ) 1272 - 1295  2012.03  [Refereed]

    　View Summary

    In the last decade, metamaterials have been gaining attention and have been investigated because of their unique characteristics, which conventional materials do not have, such as negative refraction indexes. However, it is sometimes difficult to design metamaterials on the basis of experience and theoretical considerations because the relationship between their electromagnetic characteristics and structure is often vague. A mathematical structural design methodology targeting metamaterials may therefore be useful for expanding the engineering applications of metamaterials in industry. In this paper, a new level set-based topology optimization method is proposed for designing composite right- and left-handed transmission lines, each of which consists of a waveguide and periodically located dielectric resonators. Such transmission lines function as a fundamental metamaterial. In the proposed method, the shape and topology of the dielectric resonators are represented by the level set function, and topology optimization problems are formulated on the basis of the level set-based representation. Copyright (c) 2011 John Wiley & Sons, Ltd.

    DOI

  • Structural optimization using the level set method for boundary expression

    Hamasaki S, Yamasaki S, Hara T

    Proceedings of the 2011 World Congress on Advances in Structural Engineering and Mechanics     2621 - 2635  2011.09  [Refereed]

  • A level set-based topology optimization method targeting metallic waveguide design problems

    Yamasaki S, Nomura T, Kawamoto A, Sato K, Nishiwaki S

    International Journal for Numerical Methods in Engineering   87 ( 9 ) 844 - 868  2011.09  [Refereed]

  • Heaviside projection based topology optimization by a PDE-filtered scalar function

    Atsushi Kawamoto, Tadayoshi Matsumori, Shintaro Yamasaki, Tsuyoshi Nomura, Tsuguo Kondoh, Shinji Nishiwaki

    STRUCTURAL AND MULTIDISCIPLINARY OPTIMIZATION   44 ( 1 ) 19 - 24  2011.07  [Refereed]

    　View Summary

    This paper deals with topology optimization based on the Heaviside projection method using a scalar function as design variables. The scalar function is then regularized by a PDE based filter. Several image-processing based filtering techniques have so far been proposed for regularization or restricting the minimum length scale. They are conventionally applied to the design sensitivities rather than the design variables themselves. However, it causes discrepancies between the filtered sensitivities and the actual sensitivities that may confuse the optimization process and disturb the convergence. In this paper, we propose a Heaviside projection based topology optimization method with a scalar function that is filtered by a Helmholtz type partial differential equation. Therefore, the optimality can be strictly discussed in terms of the KKT condition. In order to demonstrate the effectiveness of the proposed method, a minimum compliance problem is solved.

    DOI

  • Structural optimization of SPP color filter using a level set-based topology optimization method incorporating the ALE method

    Ohkado M, Nomura T, Matsumori T, Kawamoto A, Fujikawa H, Sato K, Yamasaki S, Nishiwaki S

    Proceedings of 9th World Congress on Structural and Multidisciplinary Optimization   ( 183 )  2011.06  [Refereed]

  • Topology optimization by using a time-dependent diffusion equation

    Kawamoto A, Matsumori T, Kondoh T, Nomura T, Yamasaki S, Nishiwaki S

    Proceedings of 9th World Congress on Structural and Multidisciplinary Optimization   ( 366 )  2011.06  [Refereed]

  • An application for a level set-based topology optimization method incorporating the ALE method

    Yamasaki S, Kawamoto A, Nomura T

    Proceedings of 9th World Congress on Structural and Multidisciplinary Optimization   ( 173 )  2011.06  [Refereed]

  • Design optimization of H-plane waveguide component by level set method

    Hirayama K, Tsuji Y, Yamasaki S, Nishiwaki S

    IEICE Transactions on Electronics   E94-C ( 5 ) 874 - 881  2011.05  [Refereed]

  • A level set-based topology optimization method using the augmented Lagrangian method

    Yamasaki S, Nomura T, Kawamoto A, Sato K, Izui K, Nishiwaki S

    Journal of Environment and Engineering   6 ( 2 ) 387 - 399  2011.03  [Refereed]

  • Design of compliant thermal actuators using structural optimization based on the level set method

    Yamada T, Yamasaki S, Nishiwaki S, Izui K, Yoshimura M

    Journal of Computing and Information Science in Engineering   11 ( 1 ) 11005  2011.03  [Refereed]

  • レベルセット法導体形状最適設計と初期構造の改良

    仲祐輔, 平山浩一, 辻寧英, 山崎慎太郎, 西脇眞二

    電気学会電磁界理論研究会資料   EMT-10 ( 102-131 ) 83 - 86  2010.11

    CiNii J-GLOBAL

  • A level set based topology optimization method targeting dynamic characteristics of rotational symmetry structures.

    Yamasaki S, Yamada T, Matsushima T, Izui K, Nishiwaki S

    Proceedings of 13th AIAA/ISSMO Multidisciplinary Analysis and Optimization Conference   ( AIAA-2010-9317 )  2010.09  [Refereed]

  • A structural optimization method based on the level set method using a new geometry-based re-initialization scheme

    Shintaro Yamasaki, Shinji Nishiwaki, Takayuki Yamada, Kazuhiro Izui, Masataka Yoshimura

    INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING   83 ( 12 ) 1580 - 1624  2010.09  [Refereed]

    　View Summary

    Structural optimization methods based on the level set method are a new type of structural optimization method where the outlines of target structures can be implicitly represented using the level set function, and updated by solving the so-called Hamilton-Jacobi equation based on a Eulerian coordinate system. These new methods can allow topological alterations, such as the number of holes, during the optimization process whereas the boundaries of the target structure are clearly defined. However, the re-initialization scheme used when updating the level set function is a critical problem when seeking to obtain appropriately updated outlines of target structures. In this paper, we propose a new structural optimization method based on the level set method using a new geometry-based re-initialization scheme where both the numerical analysis used when solving the equilibrium equations and the updating process of the level set function are performed using the Finite Element Method. The stiffness maximization, eigenfrequency maximization, and eigenfrequency matching problems are considered as optimization problems. Several design examples are presented to confirm the usefulness of the proposed method. Copyright (C) 2010 John Wiley & Sons, Ltd.

    DOI

  • Thermophotovoltaic filter design using a topology optimization method

    Kawai I, Izui K, Nishiwaki S, Nomura T, Yamasaki S

    Proceedings of 6th China-Japan-Korea Joint Symposium on Optimization of Structural and Mechanical Systems   ( J-59 )  2010.06  [Refereed]

  • Topology optimization of anti-scattering structure for electromagnetic wave

    Nomura T, Uchida N, Nishiwaki S, Matsuzawa S, Yamasaki S, Sato K

    Proceedings of 6th China-Japan-Korea Joint Symposium on Optimization of Structural and Mechanical Systems   ( J-72 )  2010.06  [Refereed]

  • Level set based topology optimization method for metamaterial design problem

    Yamasaki S, Nomura T, Sato K, Michishita N, Yamada Y, Kawamoto A

    Proceedings of 6th China-Japan-Korea Joint Symposium on Optimization of Structural and Mechanical Systems   ( J-58 )  2010.06  [Refereed]

  • A level set based topology optimization method using the discretized signed distance function as the design variables

    Shintaro Yamasaki, Tsuyoshi Nomura, Atsushi Kawamoto, Kazuo Sato, Kazuhiro Izui, Shinji Nishiwaki

    STRUCTURAL AND MULTIDISCIPLINARY OPTIMIZATION   41 ( 5 ) 685 - 698  2010.05  [Refereed]

    　View Summary

    This paper deals with a new topology optimization method based on the level set method. In the proposed method, the discretized signed distance function, a kind of level set function, is used as the design variables, and these are then updated using their sensitivities. The signed distance characteristic of the design variables are maintained by performing a re-initialization at every update during the iterated optimization procedure. In this paper, a minimum mean compliance problem and a compliant mechanism design problem are formulated based on the level set method. In the formulations of these design problems, a perimeter constraint is imposed to overcome the ill-posedness of the structural optimization problem. The sensitivity analysis for the above structural optimization problems is conducted based on the adjoint variable method. The augmented Lagrangian method is incorporated to deal with multiple constraints. Finally, several numerical examples that include multiple constraints are provided to confirm the validity of the method, and it is shown that appropriate optimal structures are obtained.

    DOI

  • Structural optimization of mechanical structures targeting vibration characteristics based on the level set method

    Yamasaki S, Nishiwaki S, Izui K, Yoshimura M

    Journal of Environment and Engineering   5 ( 1 ) 60 - 71  2010.01  [Refereed]

  • 拡張ラグランジュ法を用いたレベルセットトポロジー最適化法

    山崎慎太郎, 野村壮史, 川本敦史, 佐藤和夫, 泉井一浩, 西脇眞二

    日本機械学会論文集(C編)   75 ( 760 ) 3192 - 3200  2009.12  [Refereed]

  • 離散化された符号付き距離関数に関する感度に基づくレベルセットトポロジー最適化法

    山崎慎太郎, 野村壮史, 佐藤和夫, 西脇眞二, 山田崇恭, 泉井一浩

    日本計算工学会論文集   2009   20090012  2009.07  [Refereed]

  • Comparison of conventional re-initialization techniques and development of a new geometry-based re-initialization scheme for use in level set-based structural optimization methods

    Izui K, Yamasaki S, Nishiwaki S, Yamada T, Yoshimura M

    Proceedings of 8th World Congress on Structural and Multidisciplinary Optimization   ( 1199 )  2009.06  [Refereed]

  • Shape optimization for multiphysics problems using a high-level programming language

    Kawamoto A, Asaga Y, Nomura T, Yamasaki S, Kondoh T

    Proceedings of 8th World Congress on Structural and Multidisciplinary Optimization   ( 1295 )  2009.06  [Refereed]

  • A level set based topology optimization method using the augmented lagrangian method

    Shintaro Yamasaki, Tsuyoshi Nomura, Atsushi Kawamoto, Kazuo Sato, Kazuhiro Izui, Shinji Nishiwaki

    Nihon Kikai Gakkai Ronbunshu, C Hen/Transactions of the Japan Society of Mechanical Engineers, Part C   75 ( 760 ) 3192 - 3200  2009  [Refereed]

    　View Summary

    This paper deals with a new topology optimization method based on the level set method that incorporates the augmented Lagrangian method. In previously proposed level set based structural optimization methods, dealing with multiple constraints has been problematic yet this is typically required for real-world design problems. Incorporating the augmented Lagrangian method in the structural optimization method proposed here enables the handling of multiple constraints. The level set function is discretized using finite elements and updated based on the design sensitivity of the augmented Lagrangian with respect to the discretized level set function. In this paper, the newly proposed structural optimization method is applied to the minimum compliance problem and a compliant mechanism design problem. In the formulations of these problems, a perimeter constraint is imposed to overcome the ill-posedness of the level set method-based structural optimization. Some numerical examples that include multiple constraints are provided to confirm the validity of the method, and we show that appropriate optimal structures are obtained.

    DOI

  • Magnetic Actuator Design Using Level Set Based Topology Optimization

    Sang-in Park, Seungjae Min, Shintaro Yamasaki, Shinji Nishiwaki, Jeonghoon Yoo

    IEEE TRANSACTIONS ON MAGNETICS   44 ( 11 ) 4037 - 4040  2008.11  [Refereed]

    　View Summary

    This paper presents a novel design methodology for optimum structural design of magnetic actuators using a level set based topology optimization method where the level set method can represent the precise boundary shape of a structure and also deal with complex topological changes during the optimization process. The distribution of ferromagnetic material is represented by introducing a level set function into the definition of the magnetic reluctivity. The optimization problem is defined to obtain optimal configurations that maximize the magnetic energy of actuators under a minimum bound of total volume. The movement of the implicit moving boundaries of the structure is driven by a transformation of design sensitivities of the objective and the constraints into speed functions that govern the level set propagation. The proposed method is applied to the structural design of magnetic actuators, and is confirmed to be useful for achieving optimal configurations that deliver higher performance and lighter weight designs.

    DOI

  • 振動特性を対象としたレベルセット法に基づく機械構造物の最適化

    山崎慎太郎, 西脇眞二, 泉井一浩, 吉村允孝

    日本機械学会論文集(C編)   74 ( 746 ) 2442 - 2451  2008.10  [Refereed]

  • A new structural optimization method based on the level set method for vibration problems and heat conduction problems

    Yamasaki S, Nishiwaki S, Yamada T, Izui K, Yoshimura M

    Proceedings of 12th AIAA/ISSMO Multidisciplinary Analysis and Optimization Conference   ( AIAA-2008-6082 )  2008.09  [Refereed]

  • Structural optimization of compliant thermal micro actuators based on the level set method

    Yamada T, Yamasaki S, Nishiwaki S, Izui K, Yoshimura M

    Proceedings of 12th AIAA/ISSMO Multidisciplinary Analysis and Optimization Conference   ( AIAA-2008-5937 )  2008.09  [Refereed]

  • レベルセット法に基づく構造最適化における設計領域境界設定に関する一考察

    山田崇恭, 山崎慎太郎, 西脇眞二, 泉井一浩, 吉村允孝

    日本応用数理学会論文誌   18 ( 3 ) 487 - 505  2008.09  [Refereed]

  • Design of compliant thermal actuators using structural optimization based on the level set method

    Yamada T, Yamasaki S, Nishiwaki S, Izui K, Yoshimura M

    Proceedings of the ASME 2008 International Design Engineering Technical Conferences & Computers and Information in Engineering Conference   ( DETC2008-49618 )  2008.08  [Refereed]

  • Optimum structural design of thermal actuators using the level set method

    Yamada T, Nishiwaki S, Yamasaki S, Izui K, Yoshimura M

    Proceedings of the 5th China-Japan-Korea Joint Symposium on Optimization of Structural and Mechanical Systems   ( DT-J006 )  2008.06  [Refereed]

  • Magnetic actuator design using level set based topology optimization

    Park S, Min S, Yamasaki S, Nishiwaki S, Yoo J

    Proceedings of the 2008 International Magnetics Conference   ( EB-03 )  2008.05  [Refereed]

  • レベルセット法に基づくコンプライアント熱アクチュエータの構造最適化

    山田崇恭, 山崎慎太郎, 西脇眞二, 泉井一浩, 吉村允孝

    日本計算工学会論文集   2008   20080007  2008.04  [Refereed]

  • レベルセット法に基づくコンプライアントメカニズムの構造最適化

    山田崇恭, 山崎慎太郎, 西脇眞二, 泉井一浩, 吉村允孝

    日本計算工学会論文集   2008   20080001  2008.01  [Refereed]

  • Eigen-frequency optimization method, based on the level set method using a geometric re-initialization scheme

    Yamasaki S, Nishiwaki S, Izui K, Yoshimura M

    Proceedings of Third Asian-Pacific Congress on Computational Mechanics   ( MS35-1-3 )  2007.12  [Refereed]

  • An optimal design method for reducing brake squeal in disk brake systems

    Matsushima T, Nishiwaki S, Yamasaki S, Izui K, Yoshimura M

    Proceedings of the ASME 2007 International Design Engineering Technical Conferences & Computers and Information in Engineering Conference   ( DETC2007-34708 )  2007.09  [Refereed]

  • A structural optimization method for stiffness and vibration problems, based on the level set method using a new geometric re-initialization scheme

    Yamasaki S, Nishiwaki S, Izui K, Yoshimura M

    Proceedings of 7th World Congress on Structural and Multidisciplinary Optimization   ( A0096 )  2007.05  [Refereed]

  • トポロジカルデリバティブを用いたレベルセット法に基づく構造最適化

    山崎慎太郎, 西脇眞二, 泉井一浩, 吉村允孝

    日本計算工学会論文集   2007   20070009  2007.02  [Refereed]

  • レベルセット法に基づく機械構造物の構造最適化(新しい再初期化法の構築と剛性最大化問題への適用)

    山崎慎太郎, 西脇眞二, 泉井一浩, 吉村允孝

    日本機械学会論文集(C編)   73 ( 725 ) 72 - 79  2007.01  [Refereed]

▼display all

Books and Other Publications

  • メタマテリアルII

    野村壮史, 山﨑慎太郎( Part： Joint author, 3章)

    シーエムシー出版  2012.06 ISBN: 9784781303543

Misc

  • Mathematical model using topology optimization to produce the shapes of fish vertebrae based on the structural observations with micro-CT scans

      24   4p  2019.05

    CiNii

  • 2504 A method of generating high quality zero-level boundary tracking meshes for grayscale-free topology optimization

    YAMANAKA Seiichiro, YAMASAKI Shintaro, FUJITA Kikuo

      2015 ( 25 ) "2504 - 1"-"2504-10"  2015.09

    　View Summary

    Topology optimization is one approach of structural optimization, where various and complex shape can be represented. Because of its degree of freedom, topology optimization has potential to yield superior designs compared with sizing and shape optimizations. However, grayscale elements are often yielded, especially, in density based topology optimization methods; they influenc negatively on design problems where Dirichlet boundary conditions are imposed on the design boundary. To achieve grayscale-free topology optimization, we proposed a boundary tracking type level-set topology optimization method for three-dimensional problem in previous studies. However, the three-dimensional zero-level boundary tracking mesh often contains extremely-low quality elements, and these elements influenc negatively on finit element computation. To avoid this problem, we need a new algorithm to generate the high quality zero-level boundary tracking mesh. In this study, we propose a new mesh generation method for high quality zero-level boundary tracking mesh.

    CiNii

  • 3503 Optimal vibration-proof design of reactor core based on coupled analysis of magnetics and harmonic response

    OHNISHI Ryo, YAMASAKI Shintaro, KAWAMOTO Atsushi, SAITO Akira, KUROISHI Masakatsu, FUJITA Kikuo

      2015 ( 25 ) "3503 - 1"-"3503-10"  2015.09

    　View Summary

    This paper proposes optimal vibration-proof design of reactor core based on coupled analysis of magnetics and harmonic response. A reactor is a part of the in-vehicle DC-DC converter to boost the electric voltage, and it is composed of cores, coils, and so on. Because of electromagnetic and harmonic response characteristics of the reactor, the reactor core vibrates when the reactor core is in use, and as a result, noises are generated. To reduce these noises, a topology optimization method for reactor core design is proposed in this paper. Here, the main difficulty is to compute the electromagnetic force appropriately. Roughly speaking, standard topology optimization methods, such as density based methods, are not suitable to compute the electromagnetic force because grayscale elements smear out the structural boundary in which the electromagnetic force is imposed. Therefore, in this paper, boundary tracking type level-set based topology optimization is used where grayscale elements can be suppressed completely. Thanks to this grayscale-free topology optimization, the coupled analysis of magnetics and harmonic response is successfully performed, and as a result, topology optimization of the reactor core for reducing the noises is realized. The usefulness of the proposed method is confirmed using some numerical examples.

    CiNii

  • 3508 Topology optimization for high power motors used in hybrid electric vehicles

    YAMASAKI Shintaro, NISHIKAWA Yasunari, KAWAMOTO Atsushi, SAITO Akira, KUROISHI Masakatu, FUJITA Kikuo

      2015 ( 25 ) "3508 - 1"-"3508-7"  2015.09

    　View Summary

    This paper proposes a topology optimization method for high power motors, which is used in hybrid electric vehicles. The Permanent Magnet Synchronous motor (PMSM) is often used in hybrid electric vehicles, and its performances directly affect to performances of hybrid electric vehicles. Therefore, it is valuable to research topology optimization of PMSM. Although there are a few research papers discussing topology optimization of PMSM, these researches consider only torque performances. However, we consider that mechanical stiffness to hold permanent magnets should be also considered. If we consider only torque performances and ignore the mechanical stiffness, it will be possible to yield invalid optimal design which is meaningless in structural engineering viewpoints. In this paper, therefore, we propose a topology optimization method for PMSM, in which both torque and mechanical stiffness are maximized. In the proposed method, material distribution of the laminated electrical steel sheet of the rotor is optimized on the basis of the density method. The usefulness of the proposed method is demonstrated using some numerical examples.

    CiNii

  • W122008 Differences Between Density Based and Level-set Based Optimizations

    YAMASAKI Shintaro

    Mechanical Engineering Congress, Japan   2015   "W122008 - 1"-"W122008-2"  2015.09

    　View Summary

    In general, level-set based topology optimization is considered as a different structural optimization approach from density based topology optimization, because these approaches have different theoretical backbone. However, with the advancement of the research on these approaches, some optimization cases appear in which optimization behaviors of these approaches seem to be very similar. Therefore, in this workshop lecture, I would like to discuss essential different and common points between these approaches.

    CiNii

  • 1107 Level-set based structural optimization considering minimum length constraint

    MORIKAWA Yohei, YAMASAKI Shintaro, FUJITA Kikuo

      2014 ( 24 ) "1107 - 1"-"1107-10"  2014.09

    　View Summary

    This paper proposes a level-set based structural optimization method considering the minimum length constraint. The minimum length constraint should be considered in an engineering view point, because extreme thin parts are not preferable when processing structures. In the proposed level-set based method, the minimum length of the target structure can be easily computed by utilizing the characteristic of the signed distance function, although it is difficult in standard topology optimization methods. Furthermore, the modification method for the violation of the minimum length constraint can be easily implemented by the characteristic the signed distance function. Among many application fields for the proposed method, we now focus on a complaint mechanism design problem. Since thin hinge parts are appeared in normal compliant mechanisms, it is expected that unique designs for compliant mechanisms are obtained by constraining the minimum length. For this purpose, we develop a new level-set based structural optimization method for the compliant mechanism design problem where the minimum length is constrained. The usefulness of the proposed method is demonstrated by some numerical examples.

    CiNii

  • 1106 Grayscale-free topology optimization using the level-set method and zero-level boundary tracking mesh for the three-dimensional problem

    YAMANAKA Seiichiro, YAMASAKI Shintaro, FUJITA Kikuo

      2014 ( 24 ) "1106 - 1"-"1106-9"  2014.09

    　View Summary

    Topology optimization is one approach of structural optimization, where various and complex shape can be represented. Because of its degree of freedom, topology optimization has potential to yield superior designs compared with sizing and shape optimizations. However, grayscale elements are often yielded, especially, in density based topology optimization methods; they influence negatively on design problems where Dirichlet boundary conditions are imposed on design boundary. To achieve grayscale-free topology optimization, we proposed to use the level-set method and the zero-level boundary tracking mesh in previous studies. The zero-level boundary tracking mesh is a conformed mesh to the zero iso-contour of the level-set function and it is generated from the Eulerian mesh. In our previous studies, only the two-dimensional problem were targeted. In this study, we propose a new mesh generation method for the three-dimensional zero-level boundary tracking mesh and construct a grayscale-free topology optimization method for three-dimensional problem.

    CiNii

  • 1111 Construction of a New Boundary Tracking Type Level-set Topology Optimization Method

    YAMASAKI Shintaro, KAWSMOTO Atsushi, NOMURA Tsuyoshi, FUJITA Kikuo

      2013 ( 23 ) "1111 - 1"-"1111-8"  2013.10

    　View Summary

    This paper proposes a new level-set based topology optimization method incorporating a boundary tracking mesh generation method and non-linear programming. Since the mesh generation method provides a mesh conforming to the structural boundary at every optimization iteration, grayscale elements are completely eliminated during optimization. On the other hand, non-linear programming is widely used for efficiently updating the design variables in conventional topology optimization techniques such as homogenization and density based topology optimization. By incorporating these methods, we configure a new topology optimization method for virtually realizing completely grayscale-free, efficient topology optimization. In this paper, we first develop the mathematical formulation for obtaining sensitivity information on level-set based topology optimization problems and then implement a boundary tracking type level-set topology optimization method with the sequential linear programming (SLP) for designing compliant mechanisms. Further, we apply it to a numerical example for confirming the advantages of the proposed method and framework. Even with SLP, which is a most simple scheme of non-linear programming, the result demonstrate the relevance and promise of the proposed framework as a new class of grayscale-free topology optimization.

    CiNii

  • 2303 Compliant mechanism design using a level set-based topology optimization method incorporated with the ALE method

    Yamasaki Shintaro, Kawamoto Atsushi, Nomura Tsuyoshi

      2011 ( 21 ) 302 - 306  2011.10

    　View Summary

    Recently, many level set-based topology optimization methods have been proposed. Among them, our previously proposed level set-based topology optimization method has an advantage of eliminating grayscale elements because of incorporating the arbitrary Lagrangian Eulerian method. In this paper, we apply the previously proposed method to a compliant mechanism design problem. Since grayscale elements are completely eliminated, there is no ambiguity of the optimized structure in the engineering sense. This characteristic is very important in compliant mechanism design because compliant mechanisms usually have thin hinge parts. We demonstrate the usefulness of the proposed method using a numerical example.

    CiNii

  • レベルセット法による導体形状最適設計の検討

    平山浩一, 仲祐輔, 佐藤慎悟, 辻寧英, 山崎慎太郎, 西脇眞二

    電子情報通信学会大会講演論文集   2011   S.5-S.6  2011.08

    J-GLOBAL

  • Optimization Design of Conductor Geometry in H-Plane T-junction by Level Set Method

    TSUDUKI Yusuke, SATO Shingo, HIRAYAMA Koichi, TSUJI Yasuhide, YAMASAKI Shintaro, NISHIWAKI Shinji

      2011 ( 57 ) 217 - 220  2011.07

    CiNii

  • Structural Optimization for Mechanical Structures by a Level Set-based Topology Optimization Method Using the ALE Mesh

      16   4p  2011.05

    CiNii

  • Topology Optimization of Metallic Infrared Filter with Periodic Structure Using Level Set Method incorporating Arbitrary Lagrangian Eularian Method

    Ohkado, M, Nomura, T, Matsumori, T, Kawamoto, A, Yamasaki, S, Nishiwaki, S

    11th US National Congress on Computational Mechanics, Minneapolis, Minnesota, USA, No. 209840    2011  [Invited]

    Article, review, commentary, editorial, etc. (international conference proceedings)  

  • 異常光透過現象を用いた金属薄膜波長フィルターの構造最適化

    大門真, 野村壮史, 山﨑慎太郎, 松森唯益, 川本敦史, 近藤継男, 藤川久喜, 佐藤和夫, 西脇眞二

    第9回最適化シンポジウム2010，日本機械学会， 名古屋，日本     249 - 250  2010.12  [Invited]

    Research paper, summary (national, other academic conference)  

  • PDEフィルターを用いた射影法に基づくトポロジー最適化

    川本敦史, 松森唯益, 山﨑慎太郎, 野村壮史, 近藤継男, 西脇眞二

    第9回最適化シンポジウム2010，日本機械学会， 名古屋，日本     233 - 236  2010.12  [Invited]

    Research paper, summary (national, other academic conference)  

  • レベルセット法に基づく金属導波管設計法

    山﨑慎太郎, 野村壮史, 川本敦史, 佐藤和夫, 西脇眞二

    第9回最適化シンポジウム2010，日本機械学会， 名古屋，日本     111 - 116  2010.12  [Invited]

    Research paper, summary (national, other academic conference)  

  • 光起電力発電のためのフィルタ構造の最適設計法

    川井一平, 泉井一浩, 西脇眞二, 野村壮史, 山崎慎太郎

    第23回計算力学講演会，日本機械学会 北見，日本     365 - 367  2010.09  [Invited]

    Research paper, summary (national, other academic conference)  

  • サブ波長ナノホールアレーの構造最適化

    野村壮史, 山崎慎太郎, 西脇眞二

    2010年度年次大会講演論文集Vol.7，日本機械学会 名古屋，日本     303 - 304  2010.09  [Invited]

    Research paper, summary (national, other academic conference)  

  • Topology Optimization Using Level Set Function for Design of Sub-Wavelength Hole Array Structure Targeting Optical Characteristics

    Nomura, T, Yamasaki, S, Matsumori, T, Kawamoto, A, Nishiwaki, S, Inoue, D, Miura, A, Fujikawa, H, Sato, K

    9th World Congress on Computational Mechanics and 4th Asian Pacific Congress on Computational Mechanics, Sydney, Australia     295  2010.07  [Invited]

    Article, review, commentary, editorial, etc. (international conference proceedings)  

  • 電磁波伝搬問題に対するトポロジー最適化の適用とグレースケールの回避方法

    川井一平, 泉井一浩, 西脇眞二, 野村壮史, 山崎慎太郎

    精密工学会2010年度関西地方定期学術講演会講演論文集，精密工学会関西支部， 京都，日本     6 - 7  2010.05  [Invited]

    Research paper, summary (national, other academic conference)  

  • レベルセット法による電磁波回路伝達問題最適設計の検討

    平山浩一, 辻寧英, 坂本駿介, 仲祐輔, 山崎慎太郎, 西脇眞二

    電子情報通信学会大会講演論文集   2010   S.36-S.37  2010.03

    J-GLOBAL

  • C-2-61 Optimization Design of Conductor Geometry in H-Plane Waveguide Component

    Tsuduki Yusuke, Sakamoto Syunsuke, Hirayama Koichi, Tsuji Yasuhide, Yamasaki Shintaro, Nishiwaki Shinji

    Proceedings of the IEICE General Conference   2010 ( 1 ) 104 - 104  2010.03

    CiNii

  • Topology optimization of anti-scattering structure for dielectric obstacle

    Nomura, T, Uchida, N, Matsuzawa, S, Yamasaki, S, Nishiwaki, S

    2nd International Workshops on Advances in Computational Mechanics Yokohama, Japan     56  2010.03  [Invited]

    Article, review, commentary, editorial, etc. (international conference proceedings)  

  • Structural optimization for electromagnetic wave problem using adjoint analysis

    NOMURA Tsuyoshi, SATO Kazuo, YAMASAKI Shintaro

      2010 ( 1 ) 123 - 126  2010.01

    CiNii

  • レベルセット構造最適化法の基盤的研究

    山﨑 慎太郎, 川本 敦史, 野村 壮史

    特別教育・研究報告集     390 - 393  2010

    CiNii

  • Design Optimization of Left-handed Dielectric Metamaterial Using a Level Set Based Structural Optimization Method

    YAMASAKI Shintaro, NOMURA Tsuyoshi, SATO Kazuo, MICHISHITA Naobumi, YAMADA Yoshihide

    IEICE technical report   109 ( 304 ) 55 - 60  2009.11

    　View Summary

    Recently, the metamaterials are gaining attention and are investigated due to their specific characteristics which the conventional materials do not have, such as negative refraction index. However, it is sometimes difficult to design metamaterials based on experience and theoretical consideration. Especially, the relationship between their electromagnetic characteristics and their configuration is often vague. Therefore, a mathematical structural design methodology of metamaterials may be useful for expanding engineering application of metamaterials in industry. In this report, a new level set based topology optimization method are constructed for designing left-handed dielectric metamaterials that consist of a waveguide and periodically located dielectric-resonators.

    CiNii

  • 符号付き距離関数を設計変数として用いたトポロジー最適化法

    山崎慎太郎, 野村壮史, 川本敦史, 佐藤和夫, 泉井一浩, 西脇眞二

    第22回計算力学講演会，日本機械学会， 金沢，日本     404 - 405  2009.10  [Invited]

    Research paper, summary (national, other academic conference)  

  • CS-1-4 Optimization Design of H-Plane T-Junction by Level Set Method

    Sakamoto Syunsuke, Hirayama Koichi, Tsuji Yasuhide, Yamasaki Shintaro, Nishiwaki Shinji, Yoshimura Masataka

    Proceedings of the IEICE General Conference   2009 ( 1 ) S - 7  2009

    CiNii

  • 有限被覆法を用いたレベルセット法に基づく構造最適化

    山田恭崇, 山崎慎太郎, 西脇眞二, 泉井一浩, 吉村允孝, 車谷麻緒, 寺田賢二郎

    第18設計工学・システム部門講演会，日本機械学会， ，京都，日本，No. 3106    2008.10  [Invited]

    Research paper, summary (national, other academic conference)  

  • 構造最適化に基づくデザイン知識の獲得に関する一考察

    山崎慎太郎, 山田恭崇, 西脇眞二, 泉井一浩, 吉村允孝

    第18設計工学・システム部門講演会，日本機械学会， ，京都，日本，No. 3303    2008.10  [Invited]

    Research paper, summary (national, other academic conference)  

  • Dielectric Resonator Antenna Design Using FDTD Topology Optimization

    Nomura, T, Sato, K, Yamasaki, S, Nishiwaki, S

    proceedings of International Symposium on Antennas and Propagation 2008, Taipei, Taiwan     429 - 430  2008.10  [Invited]

    Article, review, commentary, editorial, etc. (international conference proceedings)  

  • 有限設計領域におけるレベルセット法に基づく構造最適化

    山田恭崇, 山崎慎太郎, 西脇眞二, 泉井一浩, 吉村允孝

    第50回構造強度に関する講演会講演集，日本航空宇宙学会， 福岡，日本     4 - 6  2008.07  [Invited]

    Research paper, summary (national, other academic conference)  

  • A New Structural Optimization Method Based on the Level Set Method and Its Applications

    Yamasaki, S, Nishiwaki, S, Izui, K, Yoshimura, M

    8th World Congress on Computational Mechanics (WCCM-8), Venice, Italy    2008.06  [Invited]

    Article, review, commentary, editorial, etc. (international conference proceedings)  

  • コンプライアントメカニズムのトポロジカルデリバティブを用いたレベルセット法に基づく構造最適化

    山田恭崇, 山崎慎太郎, 西脇眞二, 泉井一浩, 吉村允孝

    2008年度精密工学会春季大会，精密工学会 神奈川     885 - 886  2008.03  [Invited]

    Research paper, summary (national, other academic conference)  

    DOI

  • 熱アクチュエータのトポロジカルデリバティブを用いたレベルセット法に基づく構造最適化

    山田恭崇, 山崎慎太郎, 西脇眞二, 泉井一浩, 吉村允孝

    関西支部第83期定時総会講演会，日本機械学会， 大阪，日本     10 - 12  2008.03  [Invited]

    Research paper, summary (national, other academic conference)  

  • Structural Optimization for Eigen-Frequency Problem Based on the Level Set Method

    Yamasaki, S, Nishiwaki, S, Yamada, T, Izui, K, Yoshimura, M

    The 7th International Conference on Optimization: Techniques and Applications (ICOTA7)     269 - 270  2007.12

    Research paper, summary (international conference)  

  • レベルセット法に基づく構造最適化における有限被覆法の適用

    池内駿介, 山崎慎太郎, 西脇眞二, 泉井一浩, 吉村允孝, 車谷麻緒, 寺田賢二郎

    第19回計算力学講演会，日本機械学会， 京都，日本     679 - 680  2007.11  [Invited]

    Research paper, summary (national, other academic conference)  

  • レベルセット法に基づく構造最適化におけるパラメータ設定の検討

    山田崇恭, 山崎慎太郎, 西脇眞二, 泉井一浩, 吉村允孝

    第20回計算力学講演会，日本機械学会， 京都，日本     677 - 678  2007.11  [Invited]

    Research paper, summary (national, other academic conference)  

  • レベルセット法に基づく機械構造物の振動特性最適化

    山崎慎太郎, 西脇眞二, 泉井一浩, 吉村允孝

    第20回計算力学講演会，日本機械学会， ，京都，日本     675 - 676  2007.11  [Invited]

    Research paper, summary (national, other academic conference)  

  • レベルセット法に基づいた新しい形状最適化の方法

    西脇眞二, 山崎慎太郎

    日本機械学会年次大会 大阪，日本，講演資料集Vol.8     224 - 225  2007.09  [Invited]

    Research paper, summary (national, other academic conference)  

  • Level Set Based Structural Optimization Targeting Vibration Characteristics

    Nishiwaki, S, Yamasaki, S, Izui, K, Yoshimura, M

    The 2nd Korea-Japan Workshop on Computational Engineering, Seoul, Korea     100 - 117  2007.08  [Invited]

    Article, review, commentary, editorial, etc. (international conference proceedings)  

  • A structural Optimization Method Based on the Level Set Method Using a New Type of Re-initialization Scheme

    Yamasaki, S, Nishiwaki, S, Izui, K, Yoshimura, M

    International Conference on Computational Methods, Hiroshima, Japan     260  2007.04  [Invited]

    Article, review, commentary, editorial, etc. (international conference proceedings)  

  • 幾何学的再初期化を用いたレベルセット法に基づく形状最適化

    山崎慎太郎, 西脇眞二, 泉井一浩, 吉村允孝

    第7回最適化シンポジウム，日本機械学会， 兵庫，日本     161 - 166  2006.12  [Invited]

    Research paper, summary (national, other academic conference)  

  • レベルセット法に基づくトポロジー最適化

    山崎慎太郎, 西脇眞二, 泉井一浩, 吉村允孝

    第19回計算力学講演会，日本機械学会， 愛知，日本     33 - 34  2006.11  [Invited]

    Research paper, summary (national, other academic conference)  

▼display all

Awards

  • Achievement Award

    2021.09  

    Winner： Shintaro Yamasaki

  • 第24回計算工学講演会グラフィクスアワード最優秀賞

    2019.05   日本計算工学会  

    Winner： 山崎慎太郎

  • 2014年度フロンティア業績表彰

    2014.09   日本機械学会 設計工学・システム部門  

    Winner： 山崎慎太郎

Research Projects

  • 出力最大化および消費電力最小化を目的とした車載モーターのトポロジー最適化

    日本学術振興会  科研費基盤研究（Ｃ）

    Project Year :

    2015.04
    -
    2018.03
     

    山崎慎太郎

  • オイラー・ラグランジュ連携型物理シミュレーションに基づく機能構造の創成設計

    豊田理化学研究所  豊田理研スカラー

    Project Year :

    2015.04
    -
    2016.03
     

    山崎慎太郎

  • 駆動電圧最小化を目的とした静電駆動型MEMSのトポロジー最適化

    日本学術振興会  科研費若手研究（Ｂ）

    Project Year :

    2012.04
    -
    2015.03
     

    山崎慎太郎

Presentations

  • トポロジー最適化を用いた数理モデルによる魚類椎骨の多様な形態の再現

    坂下美咲, 山崎慎太郎, 矢地謙太郎, 近藤滋

    日本機械学会第29回設計工学・システム部門講演会 

    Presentation date： 2019.09

  • 設計条件の最小表現のもとでの網羅的なトポロジー最適化による橋梁構造のコンセプト探査.

    蓑輪和生, 錦見健太郎, 山崎慎太郎, 矢地謙太郎, 野間口大, 藤田喜久雄

    日本機械学会第29回設計工学・システム部門講演会 

    Presentation date： 2019.09

  • マイクロCT による構造観察とトポロジー最適化に基づいた魚類椎骨の形態を形成する数理モデル

    坂下美咲, 山崎慎太郎, 矢地謙太郎, 近藤滋

    日本計算工学会第24回計算工学講演会 

    Presentation date： 2019.05

  • 深層学習による構造材料分布データの性能推定

    山崎慎太郎, 矢地謙太郎, 藤田喜久雄

    日本計算工学会第24回計算工学講演会 

    Presentation date： 2019.05

  • 流動場設計を目的としたマルチフィデリティトポロジー最適化法

    矢地謙太郎, 山崎慎太郎, 藤田喜久雄

    日本計算工学会第24回計算工学講演会 

    Presentation date： 2019.05

  • 設計代替案集合からのニューラルネットワークによる設計コンセプトの抽出に関する基礎的研究

    錦見健太郎, 鬼塚舞, 野間口大, 山崎慎太郎, 矢地謙太郎, 藤田喜久雄

    日本機械学会第28回設計工学・システム部門講演会 

    Presentation date： 2018.11

  • 機械コンポーネントの構造形態と外部因子の同時最適化のためのメタモデリング法

    丸山峻, 山崎慎太郎, 矢地謙太郎, 藤田喜久雄

    日本機械学会第28回設計工学・システム部門講演会 

    Presentation date： 2018.11

  • データベースからの知識発見に基づくトポロジー最適化問題の定式化

    山崎慎太郎

    日本機械学会第31回計算力学講演会 

    Presentation date： 2018.11

  • Computational design of a heat exchanger with topology optimization

    Kobayashi H, Yaji K, Yamasaki S, Fujita K

    2018 Asian Conference on Design and Digital Engineering 

    Presentation date： 2018.11

  • ノイズフィルタ回路基板における両面導体パターンの最適化

    坊大貴, 山崎慎太郎, 矢地謙太郎, 野村勝也, 藤田喜久雄

    日本機械学会第13回最適化シンポジウム 

    Presentation date： 2018.10

  • メタモデリングに基づくトポロジー最適化問題における設計パラメータ決定法(永久磁石同期モータ設計への展開)

    丸山峻, 山崎慎太郎, 矢地謙太郎, 藤田喜久雄

    日本機械学会第13回最適化シンポジウム 

    Presentation date： 2018.10

  • 簡略化モデルを用いたトポロジー最適化の先導によるフィンアンドチューブ型熱交換器の設計

    小林広輝, 矢地謙太郎, 山崎慎太郎, 藤田喜久雄

    日本機械学会第13回最適化シンポジウム 

    Presentation date： 2018.10

  • トポロジー最適化を用いたインダクタンスキャンセル構造の導体パターン設計の検討

    野村勝也, 高橋篤弘, 小島崇, 山崎慎太郎, 矢地謙太郎, 坊大貴, 藤田喜久雄

    電気学会平成30年電気学会産業応用部門大会 

    Presentation date： 2018.08

  • データベースからの知識発見に基づくトポロジー最適化のための定式化支援システム

    山崎慎太郎, 矢地謙太郎, 藤田喜久雄

    日本計算工学会第23回計算工学講演会 

    Presentation date： 2018.06

  • Topology design via physics-based surrogate optimization for complex fluid problems

    Yaji K, Yamasaki S, Fujita K

    6th European Conference on Computational Mechanics & 7th European Conference on Computational Fluid Dynamics 

    Presentation date： 2018.06

  • Concurrent optimization using metamodeling for strucural topology and component layout

    Maruyama S, Yamasaki S, Yaji K, Fujita K

    Asian Congress of Structural and Multidisciplinary Optimization 2018 

    Presentation date： 2018.05

  • Innovative topology design for a fin-and-tube heat exchanger

    Kobayashi H, Yaji K, Yamasaki S, Fujita K

    Asian Congress of Structural and Multidisciplinary Optimization 2018 

    Presentation date： 2018.05

  • Conductor pattern optimization for electromagnetic interference filter of a double-sided circuit board

    Nomura K, Bo H, Yamasaki S, Yaji K, Takahashi A, Kojima T, Fujita K

    Asian Congress of Structural and Multidisciplinary Optimization 2018 

    Presentation date： 2018.05

  • トポロジー最適化を用いたノイズフィルタの導体パターン設計の検討

    野村勝也, 坊大貴, 山崎慎太郎, 矢地謙太郎, 高橋篤弘, 小島崇, 藤田喜久雄

    電子情報通信学会環境電磁工学研究会 

    Presentation date： 2018.03

  • 電磁デバイスの構造最適化.

    山崎慎太郎

    電子情報通信学会2018年総合大会 

    Presentation date： 2018.03

  • 軽量高剛性構造物を対象とした要素部品の配置と部材トポロジーの同時最適化

    丸山峻, 山崎慎太郎, 矢地謙太郎, 内田憲佑, 藤田喜久雄

    日本設計工学会平成29年度関西支部研究発表講演会 

    Presentation date： 2017.11

  • レドックスフロー電池の流路構造設計へのトポロジー最適化法の適用

    矢地謙太郎, 山崎慎太郎, 津島将司, 鈴木崇宏, 藤田喜久雄

    電気化学会第58回電池討論会 

    Presentation date： 2017.11

  • トポロジー最適化における設計条件と設計解の多様性に関する一考察

    山崎慎太郎, 錦見健太郎, 矢地謙太郎, 野間口大, 藤田喜久雄

    日本機械学会第27回設計工学・システム部門講演会 

    Presentation date： 2017.09

  • 応答曲面近似を用いたトポロジー最適化とシステム変数最適化の協調による永久磁石同期モータ回転子設計法

    丸山峻, 山崎慎太郎, 矢地謙太郎, 藤田喜久雄

    日本機械学会第27回設計工学・システム部門講演会 

    Presentation date： 2017.09

  • レドックスフロー電池を対象とした二次元流動場モデルに基づくトポロジー最適設計

    矢地謙太郎, 山崎慎太郎, 津島将司, 鈴木崇宏, 藤田喜久雄

    日本機械学会第27回設計工学・システム部門講演会 

    Presentation date： 2017.09

  • 電磁適合設計のためのフィルタ回路の導体パターン最適化法

    坊大貴, 山崎慎太郎, 矢地謙太郎, 野村勝也, 高橋篤弘, 藤田喜久雄

    日本機械学会第30回計算力学講演会 

    Presentation date： 2017.09

  • 構造形態とシステム変数を同時に考慮した永久磁石同期モータのシステムレベル最適設計法

    丸山峻, 山崎慎太郎, 矢地謙太郎, 藤田喜久雄

    日本機械学会第30回計算力学講演会 

    Presentation date： 2017.09

  • Optimum channel design of a redox flow battery via topology optimization

    Yaji K, Yamasaki S, Tsushima S, Suzuki T, Fujita K

    12th World Congress on Structural and Multidisciplinary Optimization 

    Presentation date： 2017.06

  • 構造形態と構成要素配置の統合最適化による永久磁石同期モータ設計

    丸山峻, 山崎慎太郎, 矢地謙太郎, 藤田喜久雄

    日本設計工学会2017年度春季大会研究発表講演会 

    Presentation date： 2017.03

  • 非線形磁気特性を考慮したハイブリッド車用高出力モーターのトポロジー最適化

    丸山峻, 山崎慎太郎, 矢地謙太郎, 藤田喜久雄

    日本機械学会第12回最適化シンポジウム 

    Presentation date： 2016.12

  • 電磁応力の領域積分に基づく磁場・構造連成問題を対象としたグレースケールフリートポロジー最適化法

    大西遼, 山崎慎太郎, 川本敦史, 齋藤彰, 黒石真且, 藤田喜久雄

    日本機械学会第26回設計工学・システム部門講演会 

    Presentation date： 2016.10

  • Three-dimensional boundary tracking type level-set topology optimization

    Yamasaki S, Yamanaka S, Fujita K

    The 12th World Congress on Computational Mechanics 

    Presentation date： 2016.07

  • A three-dimensional grayscale-free topology optimization method based on the level-set method

    Yamasaki S, Yamanaka S, Fujita K

    Asian Congress of Structural and Multidisciplinary Optimization 2016 

    Presentation date： 2016.05

  • Multidisciplinary topology optimization method for vibration-proof design of in-vehicle reactor

    Ohnishi R, Yamasaki S, Kawamoto A, Saito A, Kuroishi M, Fujita K

    Asian Conference on Design and Digital Engineering 

    Presentation date： 2015.11

  • 取出ロボットの消費電力削減

    川上みずほ, 金鐘剛, 松本拓也, 山崎慎太郎

    日本機械学会第25回設計工学・システム部門講演会 

    Presentation date： 2015.09

  • リアクトルコアの磁場と構造の連成解析による最適防振設計

    大西遼, 山崎慎太郎, 川本敦史, 齋藤彰, 黒石真且, 藤田喜久雄

    日本機械学会第25回設計工学・システム部門講演会 

    Presentation date： 2015.09

  • グレースケールフリートポロジー最適化のための高品質ゼロレベル境界追跡メッシュ作成法

    山中誠一郎, 山崎慎太郎, 藤田喜久雄

    日本機械学会第25回設計工学・システム部門講演会 

    Presentation date： 2015.09

  • ハイブリッド車用高出力モーターを対象としたトポロジー最適化

    山崎慎太郎, 西川泰成, 川本敦史, 齋藤彰, 黒石真且, 藤田喜久雄

    日本機械学会第25回設計工学・システム部門講演会 

    Presentation date： 2015.09

  • 境界追跡型レベルセットトポロジー最適化のための正則化手法に関する考察

    山崎慎太郎, 藤田喜久雄

    日本機械学会第11回最適化シンポジウム 

    Presentation date： 2014.12

  • 最小厚み制約を考慮したレベルセット法に基づく構造最適化

    森川陽平, 山崎慎太郎, 藤田喜久雄

    日本機械学会第24回設計工学・システム部門講演会 

    Presentation date： 2014.09

  • レベルセット法とゼロレベル境界追跡型メッシュによる3次元問題を対象としたグレースケールフリートポロジー最適化

    山中誠一郎, 山崎慎太郎, 藤田喜久雄

    日本機械学会第24回設計工学・システム部門講演会 

    Presentation date： 2014.09

  • 新しい境界追跡型レベルセットトポロジー最適化法の構築

    山崎慎太郎, 川本敦史, 野村壮史, 藤田喜久雄

    日本機械学会第23回設計工学・システム部門講演会 

    Presentation date： 2013.10

  • 密度法を用いたIPMSMのトポロジー最適化

    山下篤士, 山崎慎太郎, 長谷川浩志

    日本機械学会第23回設計工学・システム部門講演会 

    Presentation date： 2013.10

  • モデルベース開発とプロトタイピングの省察的相互作用についての設計実験

    戸田康太郎, 水田将史, 野間口大, 山崎慎太郎, 藤田喜久雄

    日本機械学会第23回設計工学・システム部門講演会 

    Presentation date： 2013.10

  • 境界追跡型レベルセットトポロジー最適化法を用いた機能構造物の設計

    山崎慎太郎, 川本敦史, 野村壮史, 藤田喜久雄

    精密工学会2013年度秋季大会 

    Presentation date： 2013.09

  • 密度法に基づく誘電体メタマテリアルのトポロジー最適化

    川崎純一, 山崎慎太郎

    日本機械学会第10回最適化シンポジウム 

    Presentation date： 2012.12

  • IPMSMを対象とした回転子構造のトポロジー最適化

    山下篤士, 山崎慎太郎

    日本計算工学会第17回計算工学講演会 

    Presentation date： 2012.05

  • レベルセット法による導波管フィルタ回路の導体形状最適設計

    仲祐輔, 平山浩一, 安井崇, 佐藤慎吾, 辻寧英, 山崎慎太郎, 西脇眞二

    電子情報通信学会北海道支部学生会インターネットシンポジウム 

    Presentation date： 2012.02

  • ALE法とレベルセット法を組み合わせたトポロジー最適化法によるコンプライアントメカニズムの設計

    山崎慎太郎, 川本敦史, 野村壮史

    日本機械学会第21回設計工学・システム部門講演会 

    Presentation date： 2011.10

  • レベルセット法による導体形状最適設計の検討

    平山浩一, 仲祐輔, 佐藤慎吾, 辻寧英, 山崎慎太郎, 西脇眞二

    電子情報通信学会2011年ソサイエティ大会 

    Presentation date： 2011.09

  • レベルセット法による導波管H面T分岐回路の導体形状最適設計の検討

    仲祐輔, 佐藤慎吾, 平山浩一, 辻寧英, 山崎慎太郎, 西脇眞二

    電子情報通信学会 光・電波ワークショップ電磁界理論研究会 

    Presentation date： 2011.07

  • Topology optimization of metallic infrared lter with periodic structure using level set method incorporating arbitrary Lagrangian Eularian method

    Ohkado M, Nomura T, Matsumori T, Kawamoto A, Yamasaki S, Nishiwaki S

    11th US National Congress on Computational Mechanics 

    Presentation date： 2011.07

  • ALE メッシュを用いたレベルセットトポロジー最適化法による機械構造物の最適設計

    山崎慎太郎, 川本敦史, 野村壮史

    日本計算工学会第16回計算工学講演会 

    Presentation date： 2011.05

  • レベルセット法を用いた金属薄膜波長フィルターの構造最適化

    大門真, 野村壮史, 藤川久喜, 佐藤和夫, 山崎慎太郎, 西脇眞二

    応用物理学会第58回応用物理学関係連合講演会 

    Presentation date： 2011.03

  • レベルセット法を形状表現に用いた構造最適化に関する研究

    濱崎翔平, 山崎慎太郎, 原隆

    日本建築学会2010年度中国史部研究発表会 

    Presentation date： 2011.03

  • PDEフィルターを用いた射影法に基づくトポロジー最適化

    川本敦史, 松森唯益, 山崎慎太郎, 野村壮史, 近藤継男, 西脇眞二

    日本機械学会第9回最適化シンポジウム 

    Presentation date： 2010.12

  • 異常光透過現象を用いた金属薄膜波長フィルターの構造最適化

    大門真, 野村壮史, 山崎慎太郎, 松森唯益, 川本敦史, 近藤継男, 藤川久喜, 佐藤和夫, 西脇眞二

    日本機械学会第9回最適化シンポジウム 

    Presentation date： 2010.12

  • レベルセット法に基づく金属導波管設計法

    山崎慎太郎, 野村壮史, 川本敦史, 佐藤和夫, 西脇眞二

    日本機械学会第9回最適化シンポジウム 

    Presentation date： 2010.12

  • レベルセット法導体形状最適設計と初期構造の改良

    仲祐輔, 平山浩一, 辻寧英, 山崎慎太郎, 西脇眞二

    電子情報通信学会第39回電磁界理論シンポジウム 

    Presentation date： 2010.11

  • 漏れ波アンテナの構造最適設計

    山崎慎太郎, 野村壮史, 佐藤和夫, 道下尚文, 山田吉英, 川本敦史

    Designシンポジウム2010 

    Presentation date： 2010.11

  • レベルセット法導体形状最適設計における初期構造の改良

    仲祐輔, 平山浩一, 辻寧英, 山崎慎太郎, 西脇眞二

    電子情報通信学会北海道支部連合大会 

    Presentation date： 2010.10

  • 光起電力発電のためのフィルタ構造の最適設計法

    川井一平, 泉井一浩, 西脇眞二, 野村壮史, 山崎慎太郎

    日本機械学会第23回計算力学講演会 

    Presentation date： 2010.09

  • サブ波長ナノホールアレーの構造最適化

    野村壮史, 山崎慎太郎, 西脇眞二

    日本機械学会2010年度年次大会 

    Presentation date： 2010.09

  • Topology optimization using level set function for design of sub-wavelength hole array structure targeting optical characteristic

    Nomura T, Yamasaki S, Matsumori T, Kawamoto A, Nishiwaki S, Inoue D, Miura A, Fujikawa H, Sato K

    2010 World Congress on Computational Mechanics 

    Presentation date： 2010.07

  • 電磁波伝搬問題に対するトポロジー最適化の適用とグレースケールの回避方法

    川井一平, 泉井一浩, 西脇眞二, 野村壮史, 山崎慎太郎

    精密工学会2010年度関西地方定期学術講演会 

    Presentation date： 2010.05

  • 随伴解析を用いた電磁波問題構造最適化

    野村壮史, 佐藤和夫, 山崎慎太郎

    電気学会 マグネティックス／静止器／回転機合同研究会 

    Presentation date： 2010.01

  • レベルセット法に基づく構造最適化法を用いた左手系誘電体メタマテリアルの最適設計

    山崎慎太郎, 野村壮史, 佐藤和夫, 道下尚文, 山田吉英

    電子情報通信学会 アンテナ・伝播研究会 

    Presentation date： 2009.11

  • 符号付き距離関数を設計変数として用いたトポロジー最適化法

    山崎慎太郎, 野村壮史, 川本敦史, 佐藤和夫, 泉井一浩, 西脇眞二

    日本機械学会第22回計算力学講演会 

    Presentation date： 2009.10

  • トポロジー最適化を用いた低レイノルズ数領域における流体抵抗最小化問題

    松森唯益, 川本敦史, 近藤継男, 山崎慎太郎, 野村壮史

    日本機械学会第22回計算力学講演会 

    Presentation date： 2009.10

  • H面導波管回路に対するレベルセット法を適用した最適設計

    坂本駿介, 仲祐輔, 平山浩一, 辻寧英, 山崎慎太郎, 西脇眞二

    電子情報通信学会北海道支部連合大会 

    Presentation date： 2009.10

  • レベルセット法を用いたH面導波管T分岐回路の最適設計

    坂本駿介, 平山浩一, 辻寧英, 山崎慎太郎, 西脇眞二, 吉村允孝

    電子情報通信学会総合大会 

    Presentation date： 2009.03

  • 有限被覆法を用いたレベルセット法に基づく構造最適化

    山田崇恭, 山崎慎太郎, 西脇眞二, 泉井一浩, 吉村允孝, 寺田賢二郎, 車谷麻緒

    日本機械学会第18回設計工学・システム部門講演会 

    Presentation date： 2008.09

  • 構造最適化に基づくデザイン知識の獲得に関する一考察

    山崎慎太郎, 山田崇恭, 西脇眞二, 泉井一浩, 吉村允孝

    日本機械学会第18回設計工学・システム部門講演会 

    Presentation date： 2008.09

  • 有限設計領域におけるレベルセット法に基づく構造最適化

    山田崇恭, 山崎慎太郎, 西脇眞二, 泉井一浩, 吉村允孝

    日本航空宇宙学会第50回構造強度に関する講演会 

    Presentation date： 2008.07

  • トポロジー最適化を用いた誘電体共振器アンテナの設計: 電磁界と構造力学に関する多目的最適化

    野村壮史, 佐藤和夫, 山崎慎太郎, 西脇眞二

    電子情報通信学会 アンテナ・伝播研究会 

    Presentation date： 2008.07

  • A new structural optimization method based on the level set method and its applications

    Yamasaki S, Nishiwaki S, Izui K, Yoshimura M

    8th World Congress on Computational Mechanics 

    Presentation date： 2008.06

  • Structural optimization for the design of compliant thermal actuators based on the level set method

    Yamada T, Yamasaki S, Nishiwaki S, Izui K, Yoshimura M

    8th World Congress on Computational Mechanics 

    Presentation date： 2008.06

  • レベルセット法に基づく構造最適化における設計領域境界設定に関する一考察

    山田崇恭, 山崎慎太郎, 西脇眞二, 泉井一浩, 吉村允孝

    日本応用数理学会研究部会連合発表会 

    Presentation date： 2008.05

  • 熱変形を利用したマイクロアクチュエータのトポロジカルデリバティブを用いたレベルセット法に基づく構造最適化

    山田崇恭, 山崎慎太郎, 西脇眞二, 泉井一浩, 吉村允孝

    日本計算工学会第13回計算工学講演会 

    Presentation date： 2008.05

  • 熱アクチュエータのトポロジカルデリバティブを用いたレベルセット法に基づく構造最適化

    山田崇恭, 山崎慎太郎, 西脇眞二, 泉井一浩, 吉村允孝

    日本機械学会関西支部第83期定時総会講演会 

    Presentation date： 2008.03

  • コンプライアントメカニズムのトポロジカルデリバティブを用いたレベルセット法に基づく構造最適化

    山田崇恭, 山崎慎太郎, 西脇眞二, 泉井一浩, 吉村允孝

    2008年度精密工学会春季大会 

    Presentation date： 2008.03

  • Structural optimization based on the level set method using the finite cover method

    Ikeuchi S, Yamazaki S, Nishiwaki S, Izui K, Yoshimura M, Kurumatani M, Terada K

    Third Asian-Pacific Congress on Computational Mechanics 

    Presentation date： 2007.12

  • Structural optimization for eigen-frequency problems based on the level set method

    Yamasaki S, Nishiwaki S, Yamada T, Izui K, Yoshimura M

    The 7th International Conference on Optimization: Techniques and Applications 

    Presentation date： 2007.12

  • レベルセット法に基づく構造最適化における有限被覆法の適用

    池内駿介, 山崎慎太郎, 西脇眞二, 泉井一浩, 吉村允孝, 車谷麻緒, 寺田賢二郎

    日本機械学会第20回計算力学講演会 

    Presentation date： 2007.11

  • レベルセット法に基づく構造最適化におけるパラメータ設定の検討

    山田崇恭, 山崎慎太郎, 西脇眞二, 泉井一浩, 吉村允孝

    日本機械学会第20回計算力学講演会 

    Presentation date： 2007.11

  • レベルセット法に基づく機械構造物の振動特性最適化

    山崎慎太郎, 西脇眞二, 泉井一浩, 吉村允孝

    日本機械学会第20回計算力学講演会 

    Presentation date： 2007.11

  • レベルセット法に基づいた新しい形状最適化の方法

    西脇眞二, 山崎慎太郎

    日本機械学会2007年度年次大会 

    Presentation date： 2007.09

  • Level set based structural optimization targeting vibration characteristics

    Nishiwaki S, Yamasaki S, Izui K, Yoshimura M

    The 2nd Korea-Japan Workshop on Computational Engineering 

    Presentation date： 2007.08

  • A structural optimization method based on the level set method using a new type of re-initialization scheme

    Yamasaki S, Nishiwaki S, Izui K, Yoshimura M

    International Conference on Computational Methods 

    Presentation date： 2007.04

  • 幾何学的再初期化を用いたレベルセット法に基づく形状最適化

    山崎慎太郎, 西脇眞二, 泉井一浩, 吉村允孝

    日本機械学会第7回最適化シンポジウム 

    Presentation date： 2006.12

  • レベルセット法に基づくトポロジー最適化

    山崎慎太郎, 西脇眞二, 泉井一浩, 吉村允孝

    日本機械学会第19回計算力学講演会 

    Presentation date： 2006.11

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