Leak transmission characteristic of slit-shaped apertures and effect of porous type absorption on reducing propagating sound

Takumi Asakura; Shinichi Sakamoto; Yuu Sakimoto; Fumiaki Satoh; Hideki Tachibana

doi:10.1250/ast.30.147

Leak transmission characteristic of slit-shaped apertures and effect of porous type absorption on reducing propagating sound

Takumi Asakura, Shinichi Sakamoto, Yuu Sakimoto, Fumiaki Satoh, Hideki Tachibana

Department of Mechanical Engineering

Research output: Contribution to journal › Article › peer-review

1 Citation (Scopus)

Abstract

The leak transmission characteristics of slit-shaped apertures were investigated through wave-based numerical analysis and a full-scale model experiment to determine the effects of sound absorption treatment inside the narrow apertures. The 2-dimensional sound field under investigation was divided into two spaces, the source side and the receiving side, by a rigid wall of 100nm thickness with a narrow aperture in its center part. The sound insulation performance of the separation wall between the two rooms was found to be inferior to that of the aperture, such that the flanking sound from the separation wall affects measurements results. The results show that the sound insulation performance is deteriorated in the frequency range higher than 315Hz. The sound insulation performance is also found to improve by 7dB to 15dB frequencies between 2KHz and 5KHz.

Original language	English
Pages (from-to)	147-150
Number of pages	4
Journal	Acoustical Science and Technology
Volume	30
Issue number	2
DOIs	https://doi.org/10.1250/ast.30.147
Publication status	Published - 2009

Keywords

FDTD method
Porous type absorption
Slit-shaped aperture
Sound transmission loss

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10.1250/ast.30.147

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abstract = "The leak transmission characteristics of slit-shaped apertures were investigated through wave-based numerical analysis and a full-scale model experiment to determine the effects of sound absorption treatment inside the narrow apertures. The 2-dimensional sound field under investigation was divided into two spaces, the source side and the receiving side, by a rigid wall of 100nm thickness with a narrow aperture in its center part. The sound insulation performance of the separation wall between the two rooms was found to be inferior to that of the aperture, such that the flanking sound from the separation wall affects measurements results. The results show that the sound insulation performance is deteriorated in the frequency range higher than 315Hz. The sound insulation performance is also found to improve by 7dB to 15dB frequencies between 2KHz and 5KHz.",

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AU - Sakamoto, Shinichi

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AU - Satoh, Fumiaki

AU - Tachibana, Hideki

PY - 2009

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AB - The leak transmission characteristics of slit-shaped apertures were investigated through wave-based numerical analysis and a full-scale model experiment to determine the effects of sound absorption treatment inside the narrow apertures. The 2-dimensional sound field under investigation was divided into two spaces, the source side and the receiving side, by a rigid wall of 100nm thickness with a narrow aperture in its center part. The sound insulation performance of the separation wall between the two rooms was found to be inferior to that of the aperture, such that the flanking sound from the separation wall affects measurements results. The results show that the sound insulation performance is deteriorated in the frequency range higher than 315Hz. The sound insulation performance is also found to improve by 7dB to 15dB frequencies between 2KHz and 5KHz.

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Leak transmission characteristic of slit-shaped apertures and effect of porous type absorption on reducing propagating sound

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Keywords

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