Aeroacoustic topology optimization of noise barrier based on Lighthill's acoustic analogy

Ki Hyun Kim, Gil Ho Yoon

Research output: Contribution to journalArticle

Abstract

Topology optimization for the shape of noise barrier taking into account the aeroacoustic sound source is presented based on Lighthill's acoustic analogy approach. In the previous acoustic topology optimization based on the Helmholtz equation, only simple acoustic sound sources were taken into account. To overcome this limitation, the present aeroacoustic topology optimization is performed using Lighthill's equation that represents the sound propagation by an aeroacoustic sound source. In this study, aeroacoustic sound sources are randomly generated through the stochastic noise generation and radiation method. As an interpolation method of material properties by continuous design variables, the linear filter and the sigmoid penalty function are used. The top shape of noise barrier is designed by the optimization examples for various conditions, such as random aeroacoustic sound sources, interpolation methods, and target frequencies.

Original languageEnglish
Article number115512
JournalJournal of Sound and Vibration
Volume483
DOIs
StatePublished - 2020 Sep 29

Keywords

  • Aeroacoustic sound source
  • Lighthill's acoustic analogy
  • Noise barrier
  • Topology optimization

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