A CIRCULAR TOTAL-REFLECTION ELASTIC METASURFACE FOR REDUCING SOUND RADIATION OF THIN PLATE

Feng Liu, Yanlong Xu, Zhichun Yang

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

In this paper, we propose a circular elastic metasurface (CEM) composed of subunits with different thicknesses to realize the total reflection of flexural waves in broadband, and further to achieve the broadband sound radiation of a thin plate, referred to as a CEM plate. Results demonstrate that the sound power and sound radiation efficiency of the CEM plate within the vibration isolation band are both significantly reduced compared with the corresponding uniform plate, which is attributed to the vibration isolation caused by the total reflection of flexural waves. The analyses on the wavenumber spectra of vibration velocity and supersonic intensity patterns of the CEM plate further reveal the reduction mechanism of sound radiation, which is that most of the vibration energies present as subsonic components with a weak sound-vibration coupling and a poor sound radiation ability. Our design achieves sound radiation reduction by weakening the sound-vibration coupling degree through vibration redistribution, rather than vibration reduction, providing a lossless and lightweight design method for noise reduction in engineering.

Original languageEnglish
Title of host publicationProceedings of the 30th International Congress on Sound and Vibration, ICSV 2024
EditorsWim van Keulen, Jim Kok
PublisherSociety of Acoustics
ISBN (Electronic)9789090390581
StatePublished - 2024
Event30th International Congress on Sound and Vibration, ICSV 2024 - Amsterdam, Netherlands
Duration: 8 Jul 202411 Jul 2024

Publication series

NameProceedings of the International Congress on Sound and Vibration
ISSN (Electronic)2329-3675

Conference

Conference30th International Congress on Sound and Vibration, ICSV 2024
Country/TerritoryNetherlands
CityAmsterdam
Period8/07/2411/07/24

Keywords

  • elastic metasurface
  • flexural waves
  • sound radiation reduction
  • vibration isolation

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