Country：Japan

Country：Japan

Country：Japan

Country：Japan

Authorship：Corresponding author   Language：Japanese   Publisher：JAPAN SOCIETY FOR COMPUTATIONAL ENGINEERING AND SCIENCE  

<p>The present study proposes a multi-material topology optimization method considering the strengths both of solid materials and interface. In order to consider multiple factors of Young’s modulus and strength at the same time, the DMO material interpolation function that the coefficients are given equivalently is applied. To resolve the singularity problem, we propose the stress definition adapted to the DMO material interpolation function. Furthermore, the graded interface with a two-step density filter is introduced to represent the interface on a density-based method. The tension/compression asymmetric interfacial strength criteria makes it possible to obtain an optimal layout in which the interface is not subjected to tensile strain. The validity of the method proposed in this study is verified with three structural models.</p>

DOI： 10.11421/jsces.2023.20230001

CiNii Research

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Civil Engineers  

<p>Thanks to the development of additive manufacturing technology, it is becoming possible to produce materials with desired mechanical properties defined by their periodic microstructures. To design optimal microstructures, multi-scale topology optimization has been paid attention to in many engineering fields. However, its high computational cost prevents practical use, such as high-resolution 3D analysis for precision modeling and non-linear analysis assuming actual materials. In this study, to solve this problem, we focus on the homogenization approach using fast Fourier transform and develop a new optimization method with fast computing speed and low memory requirement. By performing stiffness maximization analyses with linear elastic materials, we demonstrate the validity and efficiency of the proposed method.</p>

DOI： 10.2208/jscejj.22-15026

CiNii Research

Authorship：Corresponding author   Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Civil Engineers  

<p>A structure with high strength and toughness is an ideal structure for engineering. Some existing composite structures demonstrate these performances with the proper combination of ductile and brittle materials. In this study, we propose a topology optimization method to maximize the strength and toughness of such composite structures by assuming a two-phase structure consisting of a brittle damage material for strength and a von-Mises elastoplastic material for toughness. It uses a unique material representation method, which partially combines two material constitutive laws with different mathematical structures. In this paper, a series of formulations of the method are described, and some numerical results are presented.</p>

DOI： 10.2208/jscejj.22-15028

CiNii Research

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Civil Engineers  

<p>The present paper aims at the development of temporary brackets used for erection of additional girders for bridge maintenance construction. A lightweight and highly rigid shape made of casting without welding joints is derived using topology optimization techniques. First, FEA (finite element analysis) of the current shape is performed, and topology analysis is performed using the result as a standard for comparison. After that, we use a three-dimensional sand mold additive manufacturing a test body, performance is evaluated through a full-scale loading test. From experimental results, the effectiveness of the optimal shape using the topology optimization technique is evaluated.</p>

DOI： 10.11532/structcivil.69a.26

CiNii Research

Authorship：Corresponding author   Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：JAPAN SOCIETY FOR COMPUTATIONAL ENGINEERING AND SCIENCE  

<p>In recent years, topology optimization methods have been applied not only to structural problems but also to fluid flow problems. Most of the previous studies assume steady-state flow. In contrast, this paper focuses on topology optimization for unsteady flow, which is more general from an engineering point of view. However, unsteady flow topology optimization involves solving the governing and adjoint equations of a time-evolving system, which requires a huge computational cost for topology optimization with a fine mesh. Therefore, we propose a large-scale unsteady flow topology optimization based on the building-cube method (BCM), which is suitable for massively parallel computing. BCM is one of the hierarchical Cartesian mesh methods and is confirmed to have very good scalability. The governing equations are discretized by a cell-centered finite volume method based on the BCM. The objective sensitivity is obtained by the continuous adjoint method. Several numerical examples are demonstrated to discuss its applicability to large-scale computations.</p>

DOI： 10.11421/jsces.2023.20230007

Scopus

CiNii Research

Authorship：Corresponding author   Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：JAPAN SOCIETY FOR COMPUTATIONAL ENGINEERING AND SCIENCE  

<p>The present study proposes a multi-material topology optimization method considering the physical properties of solid materials and the interface. An extended two-step filtering technique is introduced to define material interface based on Helmholtz-type partial differential equations. Furthermore, the width of the interface region can be controlled based on this approach. To deal with the non-convexity of the problem caused by multi-material topology optimization, a material interpolation function in which the material volume fractions are mutually independent is used: this allows for the commutativity of constituent materials. The minimum mean compliance problem is considered in two different structural models. To solve this problem, sensitivities of the objective function and the constraint condition are derived. The usefulness of the proposed method is verified through several numerical examples.</p>

DOI： 10.11421/jsces.2022.20220017

CiNii Research

Authorship：Corresponding author   Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：JAPAN SOCIETY FOR COMPUTATIONAL ENGINEERING AND SCIENCE  

<p>In the field of topology optimization for heat conduction problems, the steady-state thermal conditions are usually assumed because of its theoretical ease of handling. However, for design problems such as casting dies and heat-dissipating parts, where not only the spatial distribution of temperature but also its temporal transition is important, a topology optimization method considering unsteady-state conditions is required. With this background, the present study deals with an unsteady-state heat conduction problem with a special objective function, namely minimizing temperature at the targeted time and space. The optimization problem is solved using a gradient-based optimization scheme and its accuracy of sensitivities with respect to design variables is investigated. Finally, the performance of the proposed method and a common problem for unsteady-state thermal problems are discussed through a series of the numerical examples.</p>

DOI： 10.11421/jsces.2022.20220007

CiNii Research

Language：Japanese   Publishing type：Research paper (scientific journal)  

This paper presents a two-scale topology optimization framework for determining the optimal microstructure in porous material under transient heat conduction and transfer. The new optimization model, which can consider the surface area directly from microstructure topology as the size-dependent term, is introduced to enhance the heat transfer performance. In more detail, a homogenization method capable of considering the size-dependent microscopic heat transfer effect is adopted to express the microscopic material responses. A well-known material interpolation, referred to as the SIMP approach, and the design-dependent linear function are used for interpolating intermediate material properties. The minimal transient heat compliance is chosen as an objective function in this optimization problem. For the sensitivity analysis, a coupled-adjoint variable method is adopted to derive transient sensitivity formulation. The analysis shows that the proposed topology optimization model captures not only the transient heat but also the size effect of the microstructure in a transient heat analysis in porous material.

DOI： 10.1007/s00158-022-03257-2

Web of Science

Scopus

Language：English   Publishing type：Research paper (scientific journal)   Publisher：Heat and Mass Transfer/Waerme- und Stoffuebertragung  

This paper describes the findings of a numerical and experimental study on the heat transfer coefficient and pressure drop in micro-lattice blocks fabricated by selective laser metal melting and subjected to forced air convection. In particular, the influence of the unit-cell topology on the thermofluid performance of the lattice structure is examined in detail. In the present numerical study, five lattice block designs (BCC, BCCZ, FCC, FCCZ and F2BCC) are considered for investigation. Regarding effective thermal conductivity, the FCC and FCCZ lattices offer the best performance among the various lattices. In terms of heat transfer capacity per unit mass, the BCC and BCCZ lattices exhibit superior characteristics relative to the other lattices. Also, F2BCC lattice offers the lowest pressure loss for a given relative density. In addition, it is found that the heat transfer coefficients obtained by experiment lie between two numerical results having different strut diameter, which is due to the fact that the equivalent strut diameter in the as-manufactured samples is greater, due to the present of additional metal particles fused onto the surfaces of some struts. Moreover, it is found from our experimental investigation that the heat transfer coefficient h for the BCCZ is approximately 1.3 times higher than that for the BCC lattice for the same pressure loss.

DOI： 10.1007/s00231-021-03083-0

Web of Science

Scopus

Authorship：Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：JAPAN SOCIETY FOR COMPUTATIONAL ENGINEERING AND SCIENCE  

The present paper proposes the novel design framework for thermal porous structure based on two-scale concurrent topology optimization subject to transient heat analysis. The optimization model considers the heat transfer through the microstructure surface to enhance the heat dissipation performance design. In particular, a well-known homogenization method incorporated the size-dependent term of microscopic heat transfer is exploited to obtain the material properties. Meanwhile, the unsteady-state heat condition is applied to the macrostructure. Furthermore, the heat compliance objective function and the derived analytical sensitivity formulations are adopted to determine the two-scale optimal topologies. As a numerical result, the concurrent design of micro-and macrostructures show the remarkable transient effect. It is also indicated that the microstructure size and the volume constraint are significant parameters for the design of heat performance.

DOI： 10.11421/jsces.2022.20220004

Scopus

CiNii Research

Language：Japanese   Publisher：National Committee for IUTAM  

<p>In recent years, topology optimization methods have been adopted not only for structural problems but also for fluid flow problems. Topology optimization for unsteady flows requires a fine mesh, especially for high Reynolds number flows, which is computationally expensive. Therefore, we propose an unsteady incompressible flow topology optimization method based on the building-cube method (BCM), which is suitable for massively parallel computing. The unsteady Navier-Stokes equations in the topology optimization procedure are solved by finite volume discretization, and the sensitivity of the objective function is obtained by continuous sensitivity analysis based on the adjoint variables method.</p>

DOI： 10.11345/japannctam.66.0_25

CiNii Research

Language：Japanese   Publisher：National Committee for IUTAM  

<p>As regards thermal-fluid topology optimization research, only a few studies have considered the unsteady state thermal-fluid problem. In actual design problems, there are lots of cases in which temporal changes in temperature distribution are important rather than steady-state. In this study, the framework of a density-based topology optimization method for the unsteady thermal-fluid problem is proposed. The governing equations are unsteady-state incompressible Naiver-Stokes equation and thermal convection-diffusion equation, discretized with stabilized finite element method. The numerical analysis shows that the proposed framework captures the transient effect correctly and the results of optimization are physically reliable.</p>

DOI： 10.11345/japannctam.66.0_27

CiNii Research

Language：Japanese   Publisher：National Committee for IUTAM  

<p>Unified Eulerian structure-fluid formulation is suitable for massively parallel simulation of complex-shaped material. However, it has not been applied to the simulation of viscoelastic material, which has many internal variables in conventional studies. Numerical simulations of viscoelastic material are essential for a wide range of engineering fields, such as a shock-absorbing structure. Considering the background above, we propose a unified Eulerian structure-fluid formulation with a visco-hyperelastic model in this study. The proposed method is verified by simulating the uniaxial tension test and shock-absorbing structure.</p>

DOI： 10.11345/japannctam.66.0_15

CiNii Research

Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

<p>In recent years, topology optimization methods have been adopted not only for structural problems but also for fluid flow problems. Topology optimization for unsteady flows requires a fine mesh, which is computationally expensive. Therefore, we propose an transient incompressible flow topology optimization method based on the building cube method (BCM), which is suitable for massively parallel computing. BCM is a type of hierarchical Cartesian mesh method that has been reported to have very good scalability. The transient Navier-Stokes equations in the topology optimization procedure are solved by a finite volume discretization based on the BCM. The sensitivity of the objective function is obtained by continuous sensitivity analysis based on the adjoint variables method.</p>

DOI： 10.1299/jsmeoptis.2022.14.u00058

CiNii Research

Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

<p>Thanks to the development of additive manufacturing technology, it is becoming possible to produce materials with desired mechanical properties defined by their periodic microstructures. Multi-scale topology optimization has been paid attention to in many engineering fields to design optimal microstructures. However, its high computational cost prevents practical use, such as high-resolution 3D analysis for precision modeling and non-linear analysis assuming actual materials. In this study, to solve this problem, we focus on the homogenization approach using fast Fourier transform and develop a new optimization method with fast computing speed and low memory requirement. By performing sample analyses, we demonstrate the validity and efficiency of the proposed method.</p>

DOI： 10.1299/jsmeoptis.2022.14.u00052

CiNii Research

Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

<p>As regards thermal-fluid topology optimization problems, many beneficial results have been reported. However, only a few studies have considered the unsteady state thermal-fluid problem. In actual design problems, there are lots of cases in which temporal changes in temperature distribution are important rather than steady-state. In this study, the framework of a density-based topology optimization method for the unsteady thermal-fluid problem is proposed. The governing equations are unsteady-state incompressible Naiver-Stokes equation and thermal convection-diffusion equation, discretized with stabilized finite element method. The design sensitivity is computed accurately based on the adjoint variable method. The numerical analysis shows that the proposed framework captures the transient effect correctly and the results of optimization are physically reliable.</p>

DOI： 10.1299/jsmeoptis.2022.14.u00045

CiNii Research

Language：Japanese   Publisher：Structural and Multidisciplinary Optimization  

The present study addresses a simplified topology optimization method to improve load bearing capacity. Topology optimization taking account of structurally nonlinear and complex behavior is an important topic from the viewpoint of mechanics. However, most methodologies require complex analytical derivation of sensitivity analysis and high computational cost to obtain the optimal solution. In light of this, we propose a practical design method employing the principal direction of Cauchy stress and the directional statistics, to improve load bearing capacity indirectly with much lower computational cost than those based on complex nonlinear structural analysis. Finally, we discuss setting of optimization problems, and demonstrate the accuracy and performance of the proposed method with a series of numerical examples.

DOI： 10.1007/s00158-021-03079-8

Web of Science

Scopus

Language：Japanese   Publisher：International Journal for Numerical Methods in Engineering  

The present study proposes a method of robust topology optimization assuming uncertainties in the magnitude and direction of loads applied to a geometrically nonlinear structure. The objective function is the sum of the expected value and the standard deviation of end-compliance of a structure with a compressible Neo-Hookean hyperelasticity. In this study, quadratic approximation of the end-compliance with respect to random variables is employed to reduce computational cost. To ensure its accuracy, a complete analytical formulation is derived, and the performance and limitation of the proposed method are deeply discussed. The performance of the proposed method is verified and its numerical examples emphasize the importance of considering geometrical nonlinearity to obtain robust structures with respect to uncertainties of loading conditions. Finally, we have obtained a finding that the optimized network system consisting of thin members plays a significant role in the improvement of robustness of structures.

DOI： 10.1002/nme.6584

Web of Science

Scopus

Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

<p>We propose an implicit Eulerian finite volume formulation using the reference map technique and Lagrangian maker particles to simulate deformable solid-fluid interaction problems. In this numerical framework, a set of Lagrangian maker particles represent the solid region and carry the initial position vector of solid (i.e., reference map), whereas basic equations and spatial derivatives are computed on the spatially fixed mesh. We will demonstrate several numerical examples in the presentation to validate the present approach.</p>

DOI： 10.1299/jsmecmd.2021.34.228

CiNii Research

Language：Japanese   Publisher：JAPAN SOCIETY FOR COMPUTATIONAL ENGINEERING AND SCIENCE  

<p>The present study proposes a simplified topology optimization method to improve structural strength. Topology optimization considering structurally nonlinear behavior is one of the important topics. However, most of those methodologies request the complicated analytical derivation of sensitivity analysis and also high computational costs to obtain the optimal solution. This is the reason why the optimal design method based on linear structural analysis is still common approach in practice. However, optimal layouts based on linear structural analysis may lose the structural stability under larger or uncertain load.</p><p>From this background, we propose a method of practical and simplified topology optimization to improve structural buckling behavior with much lower computational costs than that of optimal design based on complicated nonlinear structural analysis. Finally, we discuss the setting of the optimization problem improving the structural strength and demonstrate the accuracy and performance of the proposed method by a series of numerical examples.</p>

DOI： 10.11421/jsces.2020.20200006

CiNii Research

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1002/nme.6212

Web of Science

Scopus

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

CiNii Research

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1002/nme.6129

Web of Science

Scopus

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：JAPAN SOCIETY FOR COMPUTATIONAL ENGINEERING AND SCIENCE  

<p>In this study, an optimal design of lattice sandwich panels based on the ground structure method has been investigated. In our calculation, the sandwich panels were assumed to be subjected to three-point bending load. The lattices discussed in this paper can be manufactured by using the selective laser metal melting machine. Based on the former experimental study on the manufacturable diameter of each strand, a new equation for controlling the cross-section of each strand was introduced, which is based on the multiphase material optimization approach. In this paper, three kinds of unit-cell models (BCC, <i>f</i>₂BCC and half-BCC) were applied as an initial shape, and the effect of the micro-architecture on the optimized result was discussed. It is found that the lattice composed of <i>f</i>₂BCC unit behaves the lowest compliance among three geometries. The optimized shape was manufactured with a good accuracy by SLM.</p>

DOI： 10.11421/jsces.2019.20190006

CiNii Research

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：JAPAN SOCIETY FOR COMPUTATIONAL ENGINEERING AND SCIENCE  

<p>The present study proposes a topology optimization method considering finite deformation for loading uncertainty. The loading angle is assumed to be uncertain as a condition. The objective is to minimize expectation and standard deviation of end-compliance obtained by means of a Total Lagrangian finite element formulation. In this case, an analytical estimation of the expectation and the standard deviation is not allowed. In order to solve this problem, we approximate the end-compliance by a Taylor series expansion and derive the mathematical formulation. In this approach, the second derivative of the objective function is necessary to keep the accuracy in sensitivity. This phenomenon is investigated in terms of numerical validations. Finally, some numerical examples demonstrate the usefulness of the proposed method.</p>

DOI： 10.11421/jsces.2019.20190004

CiNii Research

Language：Japanese   Publisher：Japan Society of Civil Engineers  

<p> Recent development of Additive Manufacturing technology made it possible to manufacture the complex-shaped porous structures: this leads to further development and research for porous structures with special functions and characteristics. In particular, the so-called infill structure is paid attention for its high strength and robustness, and also the optimal design methods for infill structures have been reported. However, few studies has examined to extend to the practical design with stress constraint. With this reason, the present study addresses a topology optimization method for infill structures to avoid stress concentration by adding the local volume constraint and p-norm type stress constraint concept. In addition, we propose a new method, namely variable influence radius, to solve a specific problem which arises in infill optimization. Finally we discuss the setting of optimization problem and demonstrate the accuracy and performance of the proposed method by a series of numerical examples.</p>

DOI： 10.2208/jscejam.75.68

CiNii Research

Web of Science

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：JAPAN SOCIETY FOR COMPUTATIONAL ENGINEERING AND SCIENCE  

<p>The present study proposes topology optimization of microstructure considering elastoplastic deformation based on a decoupling multi-scale analysis. Energy absorption capacity of macrostructure is maximized under a prescribed material volume of microstructure. It is assumed that microstructure consists of a two-phase material based on elastoplastic von Mises model and that macrostructure is modeled with anisotropic Hill’s elastoplasticity. In this study, we extend the analytical sensitivity method used for mono-scale analysis to the decoupling multi-scale analysis and propose a framework of new multi-scale topology optimization, which can reduce the computational costs with keeping sensitivities highly accurate. It is verified by a series of numerical examples that the proposed method provides reliable optimization results and has a great potential for advanced material design.</p>

DOI： 10.11421/jsces.2018.20180015

CiNii Research

Other Link： https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-16J02523/

Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.11421/jsces.2018.20180014

Language：English   Publishing type：Research paper (scientific journal)   Publisher：Springer Verlag  

Manufacturing-oriented topology optimization has been extensively studied the past two decades, in particular for the conventional manufacturing methods, for example, machining and injection molding or casting. Both design and manufacturing engineers have benefited from these efforts because of the close-to-optimal and friendly-to-manufacture design solutions. Recently, additive manufacturing (AM) has received significant attention from both academia and industry. AM is characterized by producing geometrically complex components layer-by-layer, and greatly reduces the geometric complexity restrictions imposed on topology optimization by conventional manufacturing. In other words, AM can make near-full use of the freeform structural evolution of topology optimization. Even so, new rules and restrictions emerge due to the diverse and intricate AM processes, which should be carefully addressed when developing the AM-specific topology optimization algorithms. Therefore, the motivation of this perspective paper is to summarize the state-of-art topology optimization methods for a variety of AM topics. At the same time, this paper also expresses the authors’ perspectives on the challenges and opportunities in these topics. The hope is to inspire both researchers and engineers to meet these challenges with innovative solutions.

DOI： 10.1007/s00158-018-1994-3

Scopus

Publishing type：Research paper (scientific journal)  

© 2018, Springer-Verlag GmbH Germany, part of Springer Nature. The present study proposes multi-scale topology optimization for polycrystalline microstructures applying a multi-phase field method. The objective function is to maximize the heat compliance of macrostructure and the equality constraint is the material volume of constituents in an alloy consisting of two components with different heat conductivity. Two-scale steady-state heat conduction problem based on a homogenization method is conducted. The Allen-Cahn non-conserved time evolution equation with the additional volume constraint scheme is employed as the optimization strategy for updating the crystal configuration. In the time evolution equation, sensitivities of objective function with respect to phase-field variables are considered to relate topology optimization to the multi-phase field method. It is verified from a series of numerical examples that the proposed method has great potential for the development of material design underlying polycrystalline structure.

DOI： 10.1007/s00158-018-1965-8

Scopus

Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：John Wiley and Sons Ltd  

This study proposes a two-scale topology optimization method for a microstructure (an in-plane unit cell) that maximizes the macroscopic mechanical performance of composite plates. The proposed method is based on the in-plane homogenization method for a composite plate model in which the macrostructure is modeled using thick plate theory and the microstructures are three-dimensional solids. Macroscopic plate characteristics such as homogenized plate stiffnesses and generalized thermal strains are evaluated through the application of numerical plate tests applied to an in-plane unit cell. To handle large rotations of the composite plates, we employ a co-rotational formulation that facilitates working with the two-scale plate model formulated within a small strain framework. Two types of objective functions are tested in the presented optimization problems: one minimizes the macroscopic end compliance to maximize the macroscopic plate stiffness, whereas the other maximizes components of a macroscopic nodal displacement vector. Analytical sensitivities are derived based on in-plane homogenization formulae so that a gradient-based method can be employed to update the topology of in-plane unit cells. Several numerical examples are presented to demonstrate the proposed method's capability related to the design of optimal in-plane unit cells of composite plates. Copyright © 2017 John Wiley &amp
Sons, Ltd.

DOI： 10.1002/nme.5545

Scopus

Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：John Wiley and Sons Ltd  

The present study proposes a method of micro-macro concurrent topology optimization for a two-phase nonlinear solid to minimize the end compliance of its macrostructure undergoing large deformation. To reduce the computational costs to solve a 2-scale boundary value problem under geometrically nonlinear setting, we use the so-called method of decoupling multiscale structural analysis, in which the microscopic and macroscopic boundary value problems are decoupled in the homogenization process. An isotropic hyperelasticity model is used for the constitutive model for microstructures, while an orthotropic one is assumed to represent the macroscopic material behavior. Owing to this decoupling framework, the micro-macro concurrent optimization problem can be split into 2 individual problems at the microscale and macroscale for the sake of algorithmic simplicity. Also, a 2-scale adjoint sensitivity analysis can be performed within the framework of computational homogenization. It is verified from a series numerical examples that the proposed method is capable of computing the optimal structures at both microscale and macroscale, according to the level of applied load.

DOI： 10.1002/nme.5571

Scopus

Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

DOI： 10.1299/jsmeoptis.2018.13.113

CiNii Research

Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

<p>Infill structure - which consists of porous and solid phases over the structures, is getting a lot of attention due to its multi-functional performance, such as light weight, high-thermal convention and the potential redundancy. Nowadays, the manufacturing for this kind of geometrically complicated structure becomes possible by the recent development of Additive Manufacturing technology and furthermore topology optimization is often applied for the design to improve those structural performances. In infill topology optimization, too slender members often remain as a result of the severe density local constraints: this leads to undesirable local failure in the members even under small deformation. In this research, we propose a filtering method to avoid those thin members and local failure by introducing a variable length radius.</p>

DOI： 10.1299/jsmecmd.2018.31.312

CiNii Research

Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

<p>The present paper proposes a topology optimization method considering finite deformation for loading uncertainty. The loading angle is assumed to be uncertain as a condition. The objective is to minimize mean and standard deviation of structural compliance. In case of finite deformation theory, an analytical estimation of the mean and the standard deviation is not allowed. In order to solve this problem, we approximate the objective function by a Taylor series expansion and derive the mathematical formulation. In this approach, the second derivative of the objective function is necessary to keep the accuracy in sensitivity. This phenomenon is investigated in terms of numerical validations. Finally, some numerical examples demonstrate the usefulness of the proposed method.</p>

DOI： 10.1299/jsmecmd.2018.31.277

CiNii Research

Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

<p>In this research, an optimization design of the lattice structure is investigated, which is based on the ground structure method. In recent years, as a result of the rapid development of additional manufacturing technology, it has become possible to manufacture complicated shapes including periodic lattice structure. However, in real metal lattice samples, geometric imperfections, such as irregularities and geometric constraints on the surface of the beam elements, i.e. the maximum overhang angles exist in every unit because of the stochastic influence of feasible processing path. So in this study, a lattice structure was targeted as the shape before optimization, and a new ground structure method which does not leave elements with small cross sectional area was proposed. Here, the lattice structure studied in this paper can be manufactured by the selective laser melting machine. In addition, the effect of geometric constraints caused by AM manufacturing techniques on optimized results are discussed based on robust topology optimization combining perturbation methods for quantifying uncertainty. In the end, a robust topology optimization was discussed as a problem to minimize expected value and standard deviation of compliance.</p>

DOI： 10.1299/jsmecmd.2018.31.134

CiNii Research

Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

<p>This study deals with the ideal topological design of vibrating structures. For static structures, well-known compliance minimization is defined as the inner product of the external force and static displacement. However, for dynamic structures with time-varying forces and displacements, defining a measure for dynamic stiffness are required. Therefore, various objective functions have been proposed to suppress the response of vibrating structures. In this study, these various objective functions are compared from the viewpoint of vibration suppression. The examples of numerical calculation when adopting mean strain energy and mean squared dynamic compliance as objective functions are presented.</p>

DOI： 10.1299/jsmecmd.2018.31.291

CiNii Research

Language：English   Publishing type：Research paper (scientific journal)   Publisher：SPRINGER  

A novel computational surface engineering framework is developed to design micro-textures which can optimize the macroscopic response of hydrodynamically lubricated interfaces. All macroscopic objectives are formulated and analyzed within a homogenization-based two-scale setting and the micro-texture design is achieved through topology optimization schemes. Two non-standard aspects of this multiscale optimization problem, namely the temporal and spatial variations in the homogenized response of the micro-texture, are individually addressed. Extensive numerical investigations demonstrate the ability of the framework to deliver optimal micro-texture designs as well as the influence of major problem parameters.

DOI： 10.1007/s00158-017-1713-5

Web of Science

Language：English   Publishing type：Research paper (scientific journal)   Publisher：The Japan Society of Mechanical Engineers  

<p>The conventional phase-field topology optimization (PFTO) models minimize not only the objective function but also the interface energy. In the present study, a new PFTO model, which minimizes only the objective function, is developed by removing the curvature effect from the conventional PFTO model. Simulations of elastic strain energy minimization under a constant-volume constraint condition of a cantilever are performed using the developed and conventional PFTO models. From the simulation results, we confirm that the developed PFTO model that removes the curvature effects can efficiently optimize only the objective function.</p>

DOI： 10.1299/mej.16-00462

Publishing type：Research paper (international conference proceedings)  

Damage of tunnels often occurs in Japan caused by swelling smectite rockmass. For an effective countermeasure against the damage, mechanical interaction between tunnel lining and swelling rock mass are analyzed by a two-scale analysis based on a homogenization theory in this study. In the microscopic scale, swelling of smectite minerals and damage process of surrounding intact rocks induced by the swelling of smectite minerals are analyzed by a 3D continuous damage model. This microscopic analysis provides the averaged volumetric change and the damaged macroscopic stiffness of the representative volumetric element (RVE) of rock mass. In the macroscopic scale, therefore, stress distribution within/around the tunnel lining can be reasonably analyzed by using the averaged secant stiffness and its volumetric strain of the RVE. The mechanical interaction between the tunnel lining and swelling rock mass is discussed and examined as some case studies are carried out.

Scopus

Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.11421/jsces.2016.20160024

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1007/s00466-016-1300-4

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.engfracmech.2016.01.020

Authorship：Lead author   Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.2208/jscejam.72.27

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1002/nme.5256

Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.2208/jscejam.71.I_203

Authorship：Lead author   Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.11421/jsces.2016.20160001

Authorship：Lead author   Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.11421/jsces.2015.20150014

Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.2208/jscejam.71.I_245

Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.2208/jscejam.71.I_235

Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.11421/jsces.2014.20140014

Authorship：Lead author   Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.11421/jsces.2014.20140012

Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.11421/jsces.2014.20140004

Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1002/nag.2202

Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.5610/jaee.14.2_16

Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.2208/jscejam.70.I_307

Authorship：Lead author   Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.2208/jscejam.70.I_173

Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.2208/jscejam.70.10

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1080/09243046.2014.915098

Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.2208/jscejam.70.I_317

Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.2208/jscejam.70.I_519

Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.11421/jsces.2013.20130022

Language：English   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.11421/jsces.2013.20130015

Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.engstruct.2012.10.029

Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.11421/jsces.2013.20130010

Authorship：Lead author   Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.2208/jscejam.69.I_133

Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.1299/kikaia.79.1840

Language：Japanese   Publishing type：Research paper (scientific journal)  

Authorship：Lead author   Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.2208/jscejam.68.I_279

Authorship：Lead author   Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.2208/jscejam.67.54

Language：Japanese  

Authorship：Lead author   Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.2208/jscejam.67.I_107

Authorship：Lead author   Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.2208/jscejam.67.39

Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.finel.2010.01.001

Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)  

Authorship：Lead author   Language：Japanese  

Language：English   Publishing type：Rapid communication, short report, research note, etc. (scientific journal)   Publisher：John Wiley and Sons Ltd  

The present study proposes a method of micro-macro concurrent topology optimization for a two-phase nonlinear solid to minimize the end compliance of its macrostructure undergoing large deformation. To reduce the computational costs to solve a 2-scale boundary value problem under geometrically nonlinear setting, we use the so-called method of decoupling multiscale structural analysis, in which the microscopic and macroscopic boundary value problems are decoupled in the homogenization process. An isotropic hyperelasticity model is used for the constitutive model for microstructures, while an orthotropic one is assumed to represent the macroscopic material behavior. Owing to this decoupling framework, the micro-macro concurrent optimization problem can be split into 2 individual problems at the microscale and macroscale for the sake of algorithmic simplicity. Also, a 2-scale adjoint sensitivity analysis can be performed within the framework of computational homogenization. It is verified from a series numerical examples that the proposed method is capable of computing the optimal structures at both microscale and macroscale, according to the level of applied load.

DOI： 10.1002/nme.5571

Scopus

Language：English   Publishing type：Rapid communication, short report, research note, etc. (scientific journal)   Publisher：SPRINGER  

A novel computational surface engineering framework is developed to design micro-textures which can optimize the macroscopic response of hydrodynamically lubricated interfaces. All macroscopic objectives are formulated and analyzed within a homogenization-based two-scale setting and the micro-texture design is achieved through topology optimization schemes. Two non-standard aspects of this multiscale optimization problem, namely the temporal and spatial variations in the homogenized response of the micro-texture, are individually addressed. Extensive numerical investigations demonstrate the ability of the framework to deliver optimal micro-texture designs as well as the influence of major problem parameters.

DOI： 10.1007/s00158-017-1713-5

Web of Science

Language：English   Publishing type：Rapid communication, short report, research note, etc. (scientific journal)   Publisher：The Japan Society of Mechanical Engineers  

<p>The conventional phase-field topology optimization (PFTO) models minimize not only the objective function but also the interface energy. In the present study, a new PFTO model, which minimizes only the objective function, is developed by removing the curvature effect from the conventional PFTO model. Simulations of elastic strain energy minimization under a constant-volume constraint condition of a cantilever are performed using the developed and conventional PFTO models. From the simulation results, we confirm that the developed PFTO model that removes the curvature effects can efficiently optimize only the objective function.</p>

DOI： 10.1299/mej.16-00462

Event date： 2022.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：京都府   Country：Japan  

Event date： 2022.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：京都府   Country：Japan  

Event date： 2022.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：京都府   Country：Japan  

Event date： 2022.8 - 2022.9

Language：English   Presentation type：Oral presentation (general)  

Venue：ON LINE / CHINA   Country：China  

Event date： 2022.8 - 2022.9

Language：English   Presentation type：Oral presentation (general)  

Venue：ON LINE / CHINA   Country：China  

Event date： 2022.8 - 2022.9

Language：English   Presentation type：Oral presentation (general)  

Venue：ON LINE / CHINA   Country：China  

Event date： 2022.7 - 2022.8

Language：English   Presentation type：Oral presentation (general)  

Venue：ON LINE / YOKOHAMA   Country：Japan  

Event date： 2022.7 - 2022.8

Language：English   Presentation type：Oral presentation (general)  

Venue：ON LINE / YOKOHAMA   Country：Japan  

Event date： 2022.7 - 2022.8

Language：English   Presentation type：Oral presentation (general)  

Venue：ON LINE / YOKOHAMA   Country：Japan  

Event date： 2022.7 - 2022.8

Language：English   Presentation type：Oral presentation (general)  

Venue：ON LINE / YOKOHAMA   Country：Japan  

Event date： 2022.7 - 2022.8

Language：English   Presentation type：Oral presentation (general)  

Venue：ON LINE / YOKOHAMA   Country：Japan  

Event date： 2022.7 - 2022.8

Language：English   Presentation type：Oral presentation (general)  

Venue：ON LINE / YOKOHAMA   Country：Japan  

Event date： 2022.7 - 2022.8

Language：English   Presentation type：Oral presentation (general)  

Venue：ON LINE / YOKOHAMA   Country：Japan  

Event date： 2022.7 - 2022.8

Language：English   Presentation type：Oral presentation (general)  

Venue：ON LINE / YOKOHAMA   Country：Japan  

Event date： 2022.6

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：オンライン   Country：Japan  

Event date： 2022.6

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：オンライン   Country：Japan  

Event date： 2022.5 - 2022.6

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：秋田県   Country：Japan  

Event date： 2022.5 - 2022.6

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：秋田県   Country：Japan  

Event date： 2022.5 - 2022.6

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：秋田県   Country：Japan  

Event date： 2022.5 - 2022.6

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：秋田県   Country：Japan  

Event date： 2022.5

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：鹿児島県   Country：Japan  

Event date： 2022.5

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：鹿児島県   Country：Japan  

Event date： 2022.5

Language：English   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2022.5

Language：English   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2022.5

Language：English   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2022.5

Language：English   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2022.5

Language：English   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2022.5

Language：English   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2022.5

Language：English   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2021.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：関東　オンライン from 東海大学   Country：Japan  

Event date： 2021.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：関東　オンライン from 東海大学   Country：Japan  

Event date： 2021.9

Language：English   Presentation type：Oral presentation (general)  

Venue：Kyoto   Country：Japan  

Event date： 2021.7

Language：English   Presentation type：Oral presentation (general)  

Venue：Zoom on Line   Country：United States  

Event date： 2021.7

Language：English   Presentation type：Oral presentation (general)  

Venue：Zoom on Line   Country：United States  

Event date： 2021.7

Language：English   Presentation type：Oral presentation (general)  

Venue：Zoom on Line   Country：United States  

Event date： 2021.6

Language：English   Presentation type：Oral presentation (general)  

Venue：Zoom on Line   Country：United States  

Event date： 2021.6

Language：English   Presentation type：Oral presentation (general)  

Venue：Zoom on Line   Country：United States  

Event date： 2021.6

Language：English   Presentation type：Oral presentation (general)  

Venue：Zoom on Line   Country：United States  

Event date： 2021.6

Language：English   Presentation type：Oral presentation (general)  

Venue：Zoom on Line   Country：United States  

Event date： 2021.5

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：web上のオンライン会議   Country：Japan  

Event date： 2021.5

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：web上のオンライン会議   Country：Japan  

Event date： 2021.5

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：web上のオンライン会議   Country：Japan  

Event date： 2021.5

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：web上のオンライン会議   Country：Japan  

Event date： 2021.5

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：web上のオンライン会議   Country：Japan  

Event date： 2021.5

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：web上のオンライン会議   Country：Japan  

Event date： 2021.3

Language：English   Presentation type：Oral presentation (general)  

Venue：Sendai Online Conference   Country：Japan  

Event date： 2021.3

Language：English   Presentation type：Oral presentation (general)  

Venue：Sendai Online Conference   Country：Japan  

Event date： 2021.3

Language：English   Presentation type：Oral presentation (general)  

Venue：Sendai Online Conference   Country：Japan  

Event date： 2021.3

Language：English   Presentation type：Oral presentation (general)  

Venue：Sendai Online Conference   Country：Japan  

Event date： 2021.1

Language：English   Presentation type：Oral presentation (general)  

Venue：Paris Online Conference   Country：France  

Event date： 2021.1

Language：English   Presentation type：Oral presentation (general)  

Venue：Paris Online Conference   Country：France  

Event date： 2021.1

Language：English   Presentation type：Oral presentation (general)  

Venue：Paris Online Conference   Country：France  

Event date： 2021.1

Language：English   Presentation type：Oral presentation (general)  

Venue：Paris Online Conference   Country：France  

Event date： 2020.12

Language：English   Presentation type：Oral presentation (general)  

Venue：Kobe Online Conference   Country：Japan  

Event date： 2020.12

Language：English   Presentation type：Oral presentation (general)  

Venue：Kobe Online Conference   Country：Japan  

Event date： 2020.12

Language：English   Presentation type：Oral presentation (general)  

Venue：Kobe Online Conference   Country：Japan  

Event date： 2020.12

Language：English   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2020.11

Language：English   Presentation type：Oral presentation (general)  

Venue：Seoul by Online Conference   Country：Korea, Republic of  

Event date： 2020.11

Language：English   Presentation type：Oral presentation (general)  

Venue：Seoul Online Conference   Country：Korea, Republic of  

Event date： 2020.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：名古屋大学東山キャンパス   Country：Japan  

Event date： 2020.6

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：Zoom上の会場   Country：Japan  

Event date： 2020.6

Language：English   Presentation type：Oral presentation (general)  

Venue：Zoom上の会場   Country：Japan  

Event date： 2020.6

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：Zoom上の会場   Country：Japan  

Event date： 2020.6

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：Zoom上の会場   Country：Japan  

Event date： 2020.6

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：Zoom上の会場   Country：Japan  

Event date： 2020.6

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：Zoom上の会場   Country：Japan  

Event date： 2020.5

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：ZOOM上の会場   Country：Japan  

Event date： 2020.5

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：ZOOM上の会場   Country：Japan  

Event date： 2020.5

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：ZOOM上の会場   Country：Japan  

Event date： 2020.5

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：ZOOM上の会場   Country：Japan  

Event date： 2019.12

Language：English   Presentation type：Oral presentation (general)  

Country：Taiwan, Province of China  

Event date： 2019.12

Language：English   Presentation type：Oral presentation (general)  

Country：Taiwan, Province of China  

Event date： 2019.9

Language：English   Presentation type：Oral presentation (general)  

Country：Italy  

Event date： 2019.9

Language：English   Presentation type：Oral presentation (general)  

Country：Italy  

Event date： 2019.9

Language：English   Presentation type：Oral presentation (general)  

Country：Italy  

Event date： 2019.9

Language：English   Presentation type：Oral presentation (general)  

Country：Italy  

Event date： 2019.7 - 2019.8

Language：English   Presentation type：Oral presentation (general)  

Country：United States  

Event date： 2019.7 - 2019.8

Language：English   Presentation type：Oral presentation (general)  

Country：United States  

Event date： 2019.7 - 2019.8

Language：English   Presentation type：Oral presentation (general)  

Country：United States  

Event date： 2019.6

Language：Japanese   Presentation type：Poster presentation  

Venue：札幌市   Country：Japan  

Event date： 2019.6

Language：Japanese   Presentation type：Poster presentation  

Venue：札幌市   Country：Japan  

Event date： 2019.5

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：さいたま市大宮   Country：Japan  

Event date： 2019.5

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：さいたま市大宮   Country：Japan  

Event date： 2019.5

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：さいたま市大宮   Country：Japan  

Event date： 2019.5

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：さいたま市大宮   Country：Japan  

Event date： 2019.5

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：さいたま市大宮   Country：Japan  

Event date： 2019.5

Language：English   Presentation type：Oral presentation (general)  

Venue：Beijing   Country：China  

Event date： 2019.5

Language：English   Presentation type：Oral presentation (general)  

Venue：Beijing   Country：China  

Event date： 2019.2

Language：English   Presentation type：Oral presentation (general)  

Venue：Vienna   Country：Austria  

Event date： 2018.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：徳島   Country：Japan  

DOI： 10.1299/jsmecmd.2018.31.134

Event date： 2018.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：徳島   Country：Japan  

DOI： 10.1299/jsmecmd.2018.31.312

Event date： 2018.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：徳島   Country：Japan  

DOI： 10.1299/jsmecmd.2018.31.291

Event date： 2018.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：徳島   Country：Japan  

DOI： 10.1299/jsmecmd.2018.31.277

Event date： 2018.7

Language：English   Presentation type：Oral presentation (general)  

Venue：New York   Country：United States  

Event date： 2018.7

Language：English   Presentation type：Oral presentation (general)  

Venue：New York   Country：United States  

Event date： 2018.7

Language：English   Presentation type：Oral presentation (general)  

Venue：New York   Country：United States  

Event date： 2018.7

Language：English   Presentation type：Oral presentation (general)  

Venue：New York   Country：United States  

Event date： 2018.6

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：名古屋市   Country：Japan  

Event date： 2018.6

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：名古屋市   Country：Japan  

Event date： 2018.6

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：名古屋市   Country：Japan  

Event date： 2018.6

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：名古屋市   Country：Japan  

Event date： 2018.6

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：名古屋市   Country：Japan  

Event date： 2018.6

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：名古屋市   Country：Japan  

Event date： 2018.6

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：名古屋市   Country：Japan  

Event date： 2018.6

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：名古屋市   Country：Japan  

Event date： 2018.6

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：名古屋市   Country：Japan  

Event date： 2018.6

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：名古屋市   Country：Japan  

Event date： 2018.5

Language：English   Presentation type：Oral presentation (general)  

Venue：Dalian   Country：China  

Event date： 2018.5

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：名城大学   Country：Japan  

Event date： 2018.5

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：名城大学   Country：Japan  

Event date： 2018.5

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：名城大学   Country：Japan  

Event date： 2018.5

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：名城大学   Country：Japan  

Event date： 2018.5

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：名城大学   Country：Japan  

Event date： 2018.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：日本大学工学部（郡山市）   Country：Japan  

Event date： 2018.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：日本大学工学部（郡山市）   Country：Japan  

Event date： 2018.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：日本大学工学部（郡山市）   Country：Japan  

Event date： 2018.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：日本大学工学部（郡山市）   Country：Japan  

Event date： 2018.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：日本大学工学部（郡山市）   Country：Japan  

Event date： 2018.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：日本大学工学部（郡山市）   Country：Japan  

Event date： 2017.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：近畿大学東大阪キャンパス   Country：Japan  

DOI： 10.1299/jsmecmd.2017.30.294

Event date： 2017.9

Language：English   Presentation type：Oral presentation (general)  

Venue：Barcelona   Country：Spain  

Event date： 2017.7

Language：English   Presentation type：Oral presentation (general)  

Country：Canada  

Event date： 2017.7

Language：English   Presentation type：Oral presentation (general)  

Country：Canada  

Event date： 2017.7

Language：English   Presentation type：Oral presentation (general)  

Country：Canada  

Event date： 2017.6

Language：English   Presentation type：Oral presentation (general)  

Venue：Braunschweig   Country：Germany  

Event date： 2017.6

Language：English   Presentation type：Oral presentation (general)  

Venue：Braunschweig   Country：Germany  

Event date： 2017.5 - 2017.6

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：ソニックシティ（さいたま市）   Country：Japan  

Event date： 2017.5 - 2017.6

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：ソニックシティ（さいたま市）   Country：Japan  

Event date： 2017.5 - 2017.6

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：ソニックシティ（さいたま市）   Country：Japan  

Event date： 2017.5 - 2017.6

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：ソニックシティ（さいたま市）   Country：Japan  

Event date： 2017.5 - 2017.6

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：ソニックシティ（さいたま市）   Country：Japan  

Event date： 2017.5 - 2017.6

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：ソニックシティ（さいたま市）   Country：Japan  

Event date： 2017.5

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：京都大学   Country：Japan  

Event date： 2017.5

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：京都大学   Country：Japan  

Event date： 2017.5

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：京都大学   Country：Japan  

Event date： 2017.5

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：京都大学   Country：Japan  

Event date： 2017.5

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：京都大学   Country：Japan  

Event date： 2017.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東北工業大学   Country：Japan  

Event date： 2017.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東北工業大学   Country：Japan  

Event date： 2017.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東北工業大学   Country：Japan  

Event date： 2017.1

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：神戸国際会議場   Country：Japan  

Event date： 2017.1

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：神戸国際会議場   Country：Japan  

Event date： 2016.12

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：北海道大学   Country：Japan  

DOI： 10.1299/jsmeoptis.2016.12.2202

Event date： 2016.12

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：北海道大学   Country：Japan  

DOI： 10.1299/jsmeoptis.2016.12.2203

Event date： 2016.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：早稲田大学国際会議場井深大記念ホール   Country：Japan  

Event date： 2016.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東北大学   Country：Japan  

Event date： 2016.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東北大学   Country：Japan  

Event date： 2016.7

Language：English   Presentation type：Oral presentation (general)  

Venue：Seoul   Country：Korea, Republic of  

Event date： 2016.7

Language：English   Presentation type：Oral presentation (general)  

Venue：Seoul   Country：Korea, Republic of  

Event date： 2016.7

Language：English   Presentation type：Oral presentation (general)  

Venue：Seoul   Country：Korea, Republic of  

Event date： 2016.7

Language：English   Presentation type：Oral presentation (general)  

Venue：Seoul   Country：Korea, Republic of  

Event date： 2016.6

Language：English   Presentation type：Oral presentation (general)  

Venue：Nagasaki   Country：Japan  

Event date： 2016.6

Language：English   Presentation type：Oral presentation (general)  

Venue：Nagasaki   Country：Japan  

Event date： 2016.6

Language：English   Presentation type：Oral presentation (general)  

Country：Greece  

Event date： 2016.6

Language：English   Presentation type：Oral presentation (general)  

Country：Greece  

Event date： 2016.6

Language：English   Presentation type：Oral presentation (general)  

Country：Greece  

Event date： 2016.5 - 2016.6

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：新潟コンベンションセンター   Country：Japan  

Event date： 2016.5 - 2016.6

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：新潟コンベンションセンター   Country：Japan  

Event date： 2016.5 - 2016.6

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：新潟コンベンションセンター   Country：Japan  

Event date： 2016.5 - 2016.6

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：新潟コンベンションセンター   Country：Japan  

Event date： 2016.5 - 2016.6

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：新潟コンベンションセンター   Country：Japan  

Event date： 2016.5 - 2016.6

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：新潟コンベンションセンター   Country：Japan  

Event date： 2016.5

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：北海道大学   Country：Japan  

Event date： 2016.5

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：北海道大学   Country：Japan  

Event date： 2016.5

Language：English   Presentation type：Oral presentation (general)  

Venue：Daejeon   Country：Korea, Republic of  

Event date： 2016.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：岩手大学   Country：Japan  

Event date： 2016.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：岩手大学   Country：Japan  

Event date： 2016.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：岩手大学   Country：Japan  

Event date： 2015.10

Language：English   Presentation type：Oral presentation (general)  

Venue：Tokyo   Country：Japan  

Event date： 2015.10

Language：English   Presentation type：Oral presentation (general)  

Venue：Tokyo   Country：Japan  

Event date： 2015.10

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：横浜国立大学   Country：Japan  

DOI： 10.1299/jsmecmd.2015.28._123-1_

Event date： 2015.10

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：横浜国立大学   Country：Japan  

DOI： 10.1299/jsmecmd.2015.28._222-1_

Event date： 2015.10

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：横浜国立大学   Country：Japan  

DOI： 10.1299/jsmecmd.2015.28._214-1_

Event date： 2015.7 - 2017.7

Language：English   Presentation type：Oral presentation (general)  

Venue：San Diego   Country：United States  

Event date： 2015.7

Language：English   Presentation type：Oral presentation (general)  

Venue：San Diego   Country：United States  

Event date： 2015.7

Language：English   Presentation type：Oral presentation (general)  

Venue：San Diego   Country：United States  

Event date： 2015.6

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：つくば国際会議場   Country：Japan  

Event date： 2015.6

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：つくば国際会議場   Country：Japan  

Event date： 2015.6

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：つくば国際会議場   Country：Japan  

Event date： 2015.6

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：つくば国際会議場   Country：Japan  

Event date： 2015.6

Language：English   Presentation type：Oral presentation (general)  

Venue：Sydney   Country：Australia  

Event date： 2015.5

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：金沢市   Country：Japan  

DOI： 10.2208/jscejam.71.I_203

Event date： 2015.5

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：金沢市   Country：Japan  

Event date： 2015.5

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：金沢市   Country：Japan  

Event date： 2015.5

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：金沢市   Country：Japan  

DOI： 10.2208/jscejam.71.I_235

Event date： 2015.4

Language：English   Presentation type：Oral presentation (general)  

Venue：Sendai   Country：Japan  

Event date： 2015.3

Language：English  

Venue：Munich   Country：Germany  

Event date： 2015.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：仙台   Country：Japan  

Event date： 2015.1

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東京   Country：Japan  

Event date： 2014.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：岩手県盛岡市   Country：Japan  

DOI： 10.1299/jsmecmd.2014.27.587

Event date： 2014.10

Language：English   Presentation type：Oral presentation (general)  

Venue：Sapporo   Country：Japan  

Event date： 2014.9 - 2017.9

Language：English   Presentation type：Oral presentation (general)  

Venue：Kyoto,   Country：Japan  

Event date： 2014.9

Language：English   Presentation type：Oral presentation (general)  

Venue：Kyoto   Country：Japan  

Event date： 2014.9

Language：English   Presentation type：Oral presentation (general)  

Venue：Kyoto   Country：Japan  

Event date： 2014.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：大阪   Country：Japan  

DOI： 10.2208/jscejam.70.I_173

Event date： 2014.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：大阪   Country：Japan  

Event date： 2014.9

Language：English   Presentation type：Oral presentation (general)  

Venue：Cambridge   Country：United Kingdom  

Event date： 2014.7 - 2017.7

Language：English   Presentation type：Oral presentation (general)  

Venue：Barcelona   Country：Spain  

Event date： 2014.7 - 2017.7

Language：English   Presentation type：Oral presentation (general)  

Venue：Barcelona   Country：Spain  

Event date： 2014.7

Language：English   Presentation type：Oral presentation (general)  

Venue：Barcelona   Country：Spain  

Event date： 2014.7

Language：English   Presentation type：Oral presentation (general)  

Venue：Barcelona   Country：Spain  

Event date： 2014.7

Language：English   Presentation type：Oral presentation (general)  

Venue：Barcelona   Country：Spain  

Event date： 2014.7

Language：English   Presentation type：Oral presentation (general)  

Venue：Barcelona   Country：Spain  

Event date： 2014.7

Language：English   Presentation type：Oral presentation (general)  

Venue：Barcelona   Country：Spain  

Event date： 2014.6

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：広島   Country：Japan  

Event date： 2014.6

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：広島   Country：Japan  

Event date： 2014.6

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：広島   Country：Japan  

Event date： 2014.6

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：広島   Country：Japan  

Event date： 2014.6

Language：English   Presentation type：Oral presentation (general)  

Venue：広島   Country：Japan  

Event date： 2014.6

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：広島   Country：Japan  

Event date： 2014.6

Language：English   Presentation type：Oral presentation (general)  

Venue：Kos Island   Country：Greece  

Event date： 2014.5

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：沖縄   Country：Japan  

Event date： 2014.5

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：沖縄   Country：Japan  

Event date： 2014.5

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：沖縄   Country：Japan  

Event date： 2014.5

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：沖縄   Country：Japan  

Event date： 2014.5

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：沖縄   Country：Japan  

Event date： 2014.4

Language：English   Presentation type：Oral presentation (general)  

Venue： Sendai   Country：Japan  

Event date： 2014.4

Language：English   Presentation type：Oral presentation (general)  

Venue：Sendai   Country：Japan  

Event date： 2014.4

Language：English   Presentation type：Oral presentation (general)  

Venue：Sendai   Country：Japan  

Event date： 2014.4

Language：English   Presentation type：Oral presentation (general)  

Venue：Sendai   Country：Japan  

Event date： 2014.4

Language：English   Presentation type：Oral presentation (general)  

Venue：Sendai   Country：Japan  

Event date： 2014.4

Language：English   Presentation type：Oral presentation (general)  

Venue：Sendai   Country：Japan  

Event date： 2014.4

Language：English   Presentation type：Oral presentation (general)  

Venue：Sendai   Country：Japan  

Event date： 2014.3

Language：English   Presentation type：Oral presentation (general)  

Venue：八戸市   Country：Japan  

Event date： 2014.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：八戸市   Country：Japan  

Event date： 2014.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：八戸市   Country：Japan  

Event date： 2014.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：八戸市   Country：Japan  

Event date： 2014.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：八戸市   Country：Japan  

Event date： 2014.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：八戸市   Country：Japan  

Event date： 2013.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：佐賀市   Country：Japan  

Event date： 2013.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：千葉県習志野市   Country：Japan  

Event date： 2013.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：習志野市   Country：Japan  

Event date： 2013.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：千葉県習志野市   Country：Japan  

Event date： 2013.8

Language：English   Presentation type：Oral presentation (general)  

Venue：Sendai   Country：Japan