An efficient numerical approach to evaluate the sound insulation of acoustic metasurface

Xiang Yu, Fangsen Cui, Zhenbo Lu

Research output: Unpublished conference presentation (presented paper, abstract, poster)Conference presentation (not published in journal/proceeding/book)Academic researchpeer-review

Abstract

Aiming to design building façade with both natural ventilation and noise insulation performance, we propose an acoustic metasurface (AMS) by scaling up structured unit cells in a planar array. Each unit cell is in the shape of a short acoustic duct lined with periodic sub-chamber scatters. Acoustic stop-band exists in the periodic structure mainly due to the accumulated scatter resonance effect. An efficient numerical approach to evaluate the sound insulation performance of the proposed AMS is presented. The standard sound reduction index (SRI) is determined from the averaged sound pressure level (SPL) difference between a diffuse source room and a receiving room. The coupling between the AMS with the acoustic fields is formulated using a sub-structuring approach, and the unit cells are treated as a cluster of acoustic elements, modelled by finite element method. Modal based formulations are applied to the source and receiving rooms to characterize the acoustic excitation and the coupling effect, enabling an efficient calculation in the interested frequency range. The predicted SRI suggests it is possible to achieve high sound attenuation using the proposed metasurface, while maintaining the ability to ventilate naturally.

Original languageEnglish
Publication statusPublished - 2017
Externally publishedYes
Event24th International Congress on Sound and Vibration, ICSV 2017 - London, United Kingdom
Duration: 23 Jul 201727 Jul 2017

Conference

Conference24th International Congress on Sound and Vibration, ICSV 2017
Country/TerritoryUnited Kingdom
CityLondon
Period23/07/1727/07/17

Keywords

  • Acoustic metamaterial
  • Building acoustics
  • Noise insulation
  • Sound reduction index
  • Sub-structuring approach

ASJC Scopus subject areas

  • Acoustics and Ultrasonics

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