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Title: Noise reduction of peforated enclosure panels
Authors: Lee, YY
Ng, CF
Keywords: Noise reduction
Perforated panel
Issue Date: 2001
Publisher: Hong Kong Institution of Engineers
Source: HKIE transactions, 2001, v. 8, no. 2, p. 10-15 How to cite?
Journal: HKIE transactions 
Abstract: Typically, close-fitting enclosures are installed with sound absorption treatments to enhance the noise reduction performance at acoustic resonant frequencies. Perforated panels require small space to achieve high sound absorption at a particular frequency range when compared with typical foam or porous materials used in a close-fitting enclosure. Moreover, perforated panels may be made of any material, from plastic, plywood to sheet metal and thus are durable under severe conditions without any protection. In this paper, the sound absorption of perforated panels is investigated theoretically and experimentally. The experimental sound absorption coefficients are obtained from a series of impedance tube tests and compared with the predictions based on Maa [1]. Also, an enclosure mounted with a perforated panel is setup experimentally to explore the noise reduction performance. The general trend of the absorption performance of the perforated panels applied to the enclosure matches to that observed in the impedance tube test. From the experimental results, it can be concluded that perforated panels are effective to absorb the sound energies due to acoustic resonance of close-fitting enclosure but not those due to structural resonance.
ISSN: 1023-697X
EISSN: 2326-3733
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