Reaction-diffusion equation based topology optimization combined with the modified conjugate gradient method

Hong Kyoung Seong, Hyundo Shin, Jeonghoon Yoo, Takayuki Yamada, Shinji Nishiwaki

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The reaction-diffusion equation (RDE) based design method is a type of topology optimization methods generally employing the finite element method for physical field analysis. It uses the RDE as the design variable update scheme and its diffusion term contributes to regularize the density field. The drawback of the method is that the diffuse interfacial layer which affects the complexity of the optimization result contains the gray scale area. Moreover, the update scheme of the RDE based optimization method has employed the steepest descent method so far, although its convergence rate becomes slow near the optimum. To overcome such drawbacks, this study proposes a modified conjugate gradient method for the RDE based design method to stabilize the convergence with some numerical restrictions. It also contributes for effective elimination of intermediate materials by supplying the implicit mechanism to change the influence between the reaction and the diffusion term in the RDE. Electromagnetic as well as structural design results are given to confirm the validity of the proposed approach.

Original languageEnglish
Pages (from-to)84-95
Number of pages12
JournalFinite Elements in Analysis and Design
Volume140
DOIs
Publication statusPublished - 2018 Feb 15

Fingerprint

Conjugate gradient method
Topology Optimization
Shape optimization
Conjugate Gradient Method
Reaction-diffusion Equations
Design Method
Optimization Methods
Update
Steepest Descent Method
Structural Design
Term
Steepest descent method
Elimination
Convergence Rate
Finite Element Method
Structural design
Restriction
Optimization
Finite element method

All Science Journal Classification (ASJC) codes

  • Analysis
  • Engineering(all)
  • Computer Graphics and Computer-Aided Design
  • Applied Mathematics

Cite this

Seong, Hong Kyoung ; Shin, Hyundo ; Yoo, Jeonghoon ; Yamada, Takayuki ; Nishiwaki, Shinji. / Reaction-diffusion equation based topology optimization combined with the modified conjugate gradient method. In: Finite Elements in Analysis and Design. 2018 ; Vol. 140. pp. 84-95.
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Reaction-diffusion equation based topology optimization combined with the modified conjugate gradient method. / Seong, Hong Kyoung; Shin, Hyundo; Yoo, Jeonghoon; Yamada, Takayuki; Nishiwaki, Shinji.

In: Finite Elements in Analysis and Design, Vol. 140, 15.02.2018, p. 84-95.

Research output: Contribution to journalArticle

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AU - Shin, Hyundo

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AU - Yamada, Takayuki

AU - Nishiwaki, Shinji

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AB - The reaction-diffusion equation (RDE) based design method is a type of topology optimization methods generally employing the finite element method for physical field analysis. It uses the RDE as the design variable update scheme and its diffusion term contributes to regularize the density field. The drawback of the method is that the diffuse interfacial layer which affects the complexity of the optimization result contains the gray scale area. Moreover, the update scheme of the RDE based optimization method has employed the steepest descent method so far, although its convergence rate becomes slow near the optimum. To overcome such drawbacks, this study proposes a modified conjugate gradient method for the RDE based design method to stabilize the convergence with some numerical restrictions. It also contributes for effective elimination of intermediate materials by supplying the implicit mechanism to change the influence between the reaction and the diffusion term in the RDE. Electromagnetic as well as structural design results are given to confirm the validity of the proposed approach.

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