Sound transmission loss across coupled cavities in close proximity in a low Mach number duct flow

Y. J. Tang, Shiu Keung Tang

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

Abstract

The sound transmission losses across coupled cavities in close proximity were studied experimentally in the present investigation. Each coupled cavity was made by two shadow side branch cavities mounted on opposite walls of a rectangular duct offset by a distance d. The velocity of flow inside the duct was varied from 0 to 20 m/s. Pressure transducers were used to record the pressure fields within the cavities region. A series of pressure measurements were carried out simultaneously with the sound transmission loss measurement to better understand the sound field within the coupled cavities region. A new method of signal correlation was carried out to reduce the impact of flow turbulence on the pressure transducer signals. The results show that the increase of δ can result in stronger sound transmission loss in the absence of the duct flow. Low sound pressure region can be observed in the central part of the duct region. The sound transmission loss level was reduced when a low Mach number flow was presented in a duct. The size of the corresponding low pressure region became smaller as flow velocity increases.
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
CountryHong Kong
CityHong Kong
Period27/08/1730/08/17

Keywords

  • Low Mach number flow
  • Sound transmission loss
  • Transfer function

ASJC Scopus subject areas

  • Acoustics and Ultrasonics

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