Papers 3593

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#1Hiroki Kamada (Tohoku University)H-Index: 6

#2Junji Kato (Nagoya University)H-Index: 11

Last. Kazuo Kikawa (Honda)H-Index: 1

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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 a...

#1Francesco Di Fiore (Polytechnic University of Turin)

#2Paolo Maggiore (Polytechnic University of Turin)H-Index: 13

Last. Laura Mainini (Polytechnic University of Turin)H-Index: 6

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The multidisciplinary design optimization (MDO) of re-entry vehicles presents many challenges associated with the plurality of the domains that characterize the design problem and the multi-physics interactions. Aerodynamic and thermodynamic phenomena are strongly coupled and relate to the heat loads that affect the vehicle along the re-entry trajectory, which drive the design of the thermal protection system (TPS). The preliminary design and optimization of re-entry vehicles would benefit from ...

#1Subhayan De (CU: University of Colorado Boulder)H-Index: 7

#2Kurt Maute (CU: University of Colorado Boulder)H-Index: 48

Last. Alireza Doostan (CU: University of Colorado Boulder)H-Index: 26

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This paper addresses the computational challenges in reliability-based topology optimization (RBTO) of structures associated with the estimation of statistics of the objective and constraints using standard sampling methods. The aim is to overcome the accuracy issues of traditional methods that rely on approximating the limit-state function. Herein, we present a stochastic gradient-based approach, where we estimate the probability of failure at every few optimization iterations using an efficien...

Integrated topology and packaging optimization using coupled material and component pseudo-densities

#1Stephen Roper (Queen's University)H-Index: 52

#2Il Yong Kim (Queen's University)H-Index: 26

This paper reviews a novel method for integrated topology and packaging optimization in lightweight systems design. Presented as the component-existence model, this approach introduces a new class of packaging design variable coupled with traditional material pseudo-densities in a standard topology workflow. This method adopts a modified interpolation scheme compatible with standard finite element mesh discretizations, and through development of so-called design fields and variable mapping funct...

Mixed variational formulations for structural topology optimization based on the phase-field approach

#1Michele MarinoH-Index: 13

#2Ferdinando AuricchioH-Index: 72

Last. Ulisse StefanelliH-Index: 25

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We propose a variational principle combining a phase-field functional for structural topology optimization with a mixed (three-field) Hu-Washizu functional, then including directly in the formulation equilibrium, constitutive, and compatibility equations. The resulting mixed variational functional is then specialized to derive a classical topology optimization formulation (where the amount of material to be distributed is an \emph{a priori} assigned quantity acting as a global constraint for the...

Isogeometric topology optimization of compliant mechanisms using transformable triangular mesh (TTM) algorithm

#1Senmao DingH-Index: 1

#2Baotong LiH-Index: 14

Last. Jun Hong (Xi'an Jiaotong University)H-Index: 19

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Homogenization in a simpler way: analysis and optimization of periodic unit cells with Cauchy–Born hypothesis

#1Kun Wang (BIT: Beijing Institute of Technology)

#2Ming Cai (BIT: Beijing Institute of Technology)

Last. Gengkai Hu (BIT: Beijing Institute of Technology)

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Asymptotic expansion based homogenization has been widely used to predict the effective macroscopic properties of periodic unit cells (PUCs). In this work, we show that the homogenization process can be done in a much more elegant manner for both continuum and discrete PUCs by taking advantage of the Cauchy–Born’s hypothesis, which is a widely used rule in the area of solid physics to relate the position of the atoms in a crystal lattice and the overall strain of the medium. It is shown that in ...

Artificial neural network metamodeling-based design optimization of a continuous motorcyclists protection barrier system

Last. J. Marten HiekmannH-Index: 1

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Flexible framework for fluid topology optimization with OpenFOAM® and finite element-based high-level discrete adjoint method (FEniCS/dolfin-adjoint)

#1Diego Hayashi Alonso (USP: University of São Paulo)H-Index: 2

#2Luis Fernando Garcia Rodriguez (USP: University of São Paulo)

Last. Emílio Carlos Nelli Silva (USP: University of São Paulo)H-Index: 29

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In order to implement the topology optimization method, it is necessary to simulate the fluid flow dynamics and also obtain the sensitivities with respect to the design variable (such as through the adjoint method). However, more complex fluid flows, such as turbulent, non-Newtonian, and compressible flows, may turn the implementation of these two aspects difficult and non-intuitive. In order to solve this deadlock, this work proposes the combination of two well-known and established open-source...

A high-level programming language implementation of topology optimization applied to the acoustic-structure interaction problem

#1Junghwan KookH-Index: 6

#2Jin Hyun Chang (DTU: Technical University of Denmark)

An effective and straightforward method to implement topology optimization using high-level programming is presented. The method uses the LiveLink for MATLAB, which couples the commercial COMSOL Multiphysics software with MATLAB programming environment via COMSOL Application Programming Interface (API). The integrated environment allows one to implement advanced and customized functions and methods from scratch easily. Topology optimization of an acoustic-structure interaction problem with a mix...

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