Transactions of the JSME (in Japanese)
Online ISSN : 2187-9761
ISSN-L : 2187-9761
Computational Mechanics
CMA-ES based topology optimization for acoustic cloak
Masayuki TAKAHASHIYohei AKIMOTOGaruda FUJII
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2018 Volume 84 Issue 859 Pages 17-00590

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Abstract

This paper presents a topology optimization based on a covariance matrix adaptation evolution strategy (CMA-ES) for acoustic cloaks rendering a scattering object acoustically invisible. The cloaks are designed by minimizing the scattering of acoustic waves around the object and the objective function is defined as the integrated intensity of the scattered wave. CMA-ES is employed to search the optimal set of level set functions as design variables during a topology optimization for minimizing the objective function regularized by a perimeter constraint. Level set functions express structures with its structural boundaries clearly without grayscales during the optimization process. In the best case in our simulation, we succeed to obtain an optimal configuration which can reduce the amount of acoustic scattering to 0.81% of that in the absence of cloaking.

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© 2018 The Japan Society of Mechanical Engineers
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