Effect of membrane surface tension and backed-air gap distance on sound absorption characteristics

Zainulabidin, Muhd. Hafeez and Wan, L. M. and Ismail, A. E. and Kasron, M. Z. and M. Kassim, A. S. (2016) Effect of membrane surface tension and backed-air gap distance on sound absorption characteristics. ARPN Journal of Engineering and Applied Sciences, 11 (8). ISSN 18196608

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Abstract

This paper describes the analysis on the sound absorption characteristics of semi-permeable membrane absorber. The effects of membrane surface tension and backed-air gap distance on the sound absorption characteristics were investigated. The characteristics of the membrane absorber were measured experimentally in terms of Sound Absorption Coefficient, α and Noise Reduction Coefficient, NRC. The membrane is made of a thin, flexible, semi-permeable latex material and the tests were carried out by using impedance tube method according to ISO 10534-2 standard. The results showed that the surface tension has significant influence on the sound absorption characteristics. For the parameters used in the laboratory work, the specimen with un-stretched surface tension has the best absorption performance with 94% absorption at 1600 Hz. Membrane absorbers showed best performance at low-middle frequency region i.e. 1450-2000 Hz. The backed-air gap distances determine the location of sound absorption peak. The peak of absorption tends to shift to the lower frequency region when the air gap thickness is increased.

Item Type:Article
Uncontrolled Keywords:Membrane; sound absorption; surface tension; backed-air gap distance
Subjects:T Technology > TD Environmental technology. Sanitary engineering > TD891-894 Noise and its control
Divisions:Faculty of Mechanical and Manufacturing Engineering > Department of Mechanical Engineering Technology
ID Code:8548
Deposited By:Mr. Mohammad Shaifulrip Ithnin
Deposited On:21 Jun 2017 11:43
Last Modified:21 Jun 2017 11:43

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