Noise reduction of perforated enclosure panels

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)22_Publication in policy or professional journal

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Original languageEnglish
Pages (from-to)16-19
Journal / PublicationHKIE Transactions Hong Kong Institution of Engineers
Issue number2
Publication statusPublished - Aug 2001


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 coefficient 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.

Research Area(s)

  • Enclosure, Noise reduction, Perforated panel

Citation Format(s)