Microperforated panels (MPP) are acoustic absorbers that are reclaimable, noncombustible, and environmentally friendly. Sound is attenuated due to viscous friction in the submillimeter size pores. The panels are typically spaced from a hard surface and are most effective when the acoustic particle velocity is a maximum in the pores. In this article, the theory of MPP absorbers is briefly reviewed, and their application to noise control problems is shown. We demonstrate that the sound absorption can be tuned to targeted frequency bands by adjusting the depth of the backing cavity and enhanced by partitioning the backing cavity. In many cases, the performance is comparable to foam occupying the same volume in an enclosure.
|Number of pages||4|
|Specialist publication||Sound and Vibration|
|State||Published - Jul 2011|
ASJC Scopus subject areas
- Safety, Risk, Reliability and Quality
- Acoustics and Ultrasonics
- Mechanical Engineering