Environmental noise control by Parallel Barriers integrated withHelmholtz Resonator

Zhi Bo Wang, Yat Sze Choy

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

Abstract

Tins paper deals with the noise reduction degradation problem of parallel barriers with the rigid walls used in the traffic noise control. Various studies have shown that the insertion loss at the receivers is significantly deteriorated due to multiple reflections between the parallel reflecting surfaces. The degradation is attributed to the resonances within the semi-enclosed domain bounded by the parallel barriers and the rigid ground. To understand the physics behind, the modal equation of the parallel barriers system is obtained. The eigenfunctions governing the sound field can be expressed as the finite sum of the coupled enclosure modes and the radiation modes. In order to improve the performance of parallel barrier especially at the deteriorated frequencies, the optimal designed Helmholtz resonator is adopted to modify the acoustic mode. Numerical results in two dimension indicate that single resonator can suppress more than one resonant peak and hence improve the insertion loss. In addition, two resonators at different frequencies can significantly enhance the noise reduction in the frequencies ranging from 200 Hz to 1000 Hz.
Original languageEnglish
Title of host publicationINTER-NOISE 2017 - 46th International Congress and Exposition on Noise Control Engineering: Taming Noise and Moving Quiet
PublisherInstitute of Noise Control Engineering
Publication statusPublished - 1 Jan 2017
Event46th International Congress and Exposition on Noise Control Engineering: Taming Noise and Moving Quiet, INTER-NOISE 2017 - Hong Kong Convention and Exhibition Centre (HKCEC), Hong Kong, Hong Kong
Duration: 27 Aug 201730 Aug 2017

Conference

Conference46th International Congress and Exposition on Noise Control Engineering: Taming Noise and Moving Quiet, INTER-NOISE 2017
Country/TerritoryHong Kong
CityHong Kong
Period27/08/1730/08/17

Keywords

  • Coupled modes
  • Helmholtz resonator
  • Parallel barriers

ASJC Scopus subject areas

  • Acoustics and Ultrasonics

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