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

Y. J. Tang; Shiu Keung Tang

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

Y. J. Tang, Shiu Keung Tang

The Hong Kong Polytechnic University

Research output: Chapter in book / Conference proceeding › Conference article published in proceeding or book › Academic research › peer-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 language	English
Title of host publication	INTER-NOISE 2017 - 46th International Congress and Exposition on Noise Control Engineering: Taming Noise and Moving Quiet
Publisher	Institute of Noise Control Engineering
Publication status	Published - 1 Jan 2017
Event	46th 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 2017 → 30 Aug 2017

Conference

Conference	46th International Congress and Exposition on Noise Control Engineering: Taming Noise and Moving Quiet, INTER-NOISE 2017
Country/Territory	Hong Kong
City	Hong Kong
Period	27/08/17 → 30/08/17

Keywords

Low Mach number flow
Sound transmission loss
Transfer function

ASJC Scopus subject areas

Acoustics and Ultrasonics

Cite this

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title = "Sound transmission loss across coupled cavities in close proximity in a low Mach number duct flow",

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.",

keywords = "Low Mach number flow, Sound transmission loss, Transfer function",

author = "Tang, {Y. J.} and Tang, {Shiu Keung}",

year = "2017",

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language = "English",

booktitle = "INTER-NOISE 2017 - 46th International Congress and Exposition on Noise Control Engineering: Taming Noise and Moving Quiet",

publisher = "Institute of Noise Control Engineering",

address = "United States",

note = "46th International Congress and Exposition on Noise Control Engineering: Taming Noise and Moving Quiet, INTER-NOISE 2017 ; Conference date: 27-08-2017 Through 30-08-2017",

}

Tang, YJ & Tang, SK 2017, Sound transmission loss across coupled cavities in close proximity in a low Mach number duct flow. in INTER-NOISE 2017 - 46th International Congress and Exposition on Noise Control Engineering: Taming Noise and Moving Quiet. Institute of Noise Control Engineering, 46th International Congress and Exposition on Noise Control Engineering: Taming Noise and Moving Quiet, INTER-NOISE 2017, Hong Kong, Hong Kong, 27/08/17.

Sound transmission loss across coupled cavities in close proximity in a low Mach number duct flow. / Tang, Y. J.; Tang, Shiu Keung.
INTER-NOISE 2017 - 46th International Congress and Exposition on Noise Control Engineering: Taming Noise and Moving Quiet. Institute of Noise Control Engineering, 2017.

Research output: Chapter in book / Conference proceeding › Conference article published in proceeding or book › Academic research › peer-review

TY - GEN

T1 - Sound transmission loss across coupled cavities in close proximity in a low Mach number duct flow

AU - Tang, Y. J.

AU - Tang, Shiu Keung

PY - 2017/1/1

Y1 - 2017/1/1

N2 - 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.

AB - 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.

KW - Low Mach number flow

KW - Sound transmission loss

KW - Transfer function

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M3 - Conference article published in proceeding or book

BT - INTER-NOISE 2017 - 46th International Congress and Exposition on Noise Control Engineering: Taming Noise and Moving Quiet

PB - Institute of Noise Control Engineering

T2 - 46th International Congress and Exposition on Noise Control Engineering: Taming Noise and Moving Quiet, INTER-NOISE 2017

Y2 - 27 August 2017 through 30 August 2017

ER -

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

Abstract

Conference

Keywords

ASJC Scopus subject areas

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