반사 음장을 고려한 음향 확산 구조의 위상 최적 설계

Translated title of the contribution: Topology optimization of an acoustic diffuser considering reflected sound field

Jieun Yang, Joong Seok Lee, Yoon Young Kim

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

The main role of an acoustic diffuser is to diffuse reflected sound field spatially. Since the pioneering work of Schroeder, there have been investigations to improve its performance by using shape/sizing optimization methods. In this paper, a gradient-based topology optimization algorithm is newly presented to find the optimal distribution of reflecting materials for maximizing diffuser performance. Time-harmonic acoustic analysis in a two-dimensional acoustic domain is carried out where the domain is discretized by finite elements. Perfectly matched layers are placed to surround the domain to simulate non-reflecting boundary conditions. Design variables are assigned to each element of which material properties are interpolated between those of air and those of a rigid body. An approach to extract the reflected field from the total acoustic field is employed. To validate the effectiveness of the proposed method, design problems are solved at different frequencies. The performance of the optimized diffusers obtained by the proposed method is compared against that of the conventional Schroeder diffusers.
Translated title of the contributionTopology optimization of an acoustic diffuser considering reflected sound field
Original languageKorean
Pages (from-to)973-981
Number of pages9
JournalTransactions of the Korean Society for Noise and Vibration Engineering
Volume23
Issue number11
DOIs
Publication statusPublished - 20 Nov 2013
Externally publishedYes

Keywords

  • acoustic diffuser
  • diffuse sound field
  • reflected sound field
  • topology optimization
  • unbounded acoustic problem

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