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http://dx.doi.org/10.5050/KSNVE.2011.21.11.1059

Absorption Characteristics of Micro-perforated Panel Absorber According to High Incident Pressure Magnitude and Variation of Geometric Parameters  

Park, Soon-Hong (한국항공우주연구원 발사체기술연구소)
Seo, Sang-Hyun (한국한공우주연구원 발사체기술연구소)
Publication Information
Transactions of the Korean Society for Noise and Vibration Engineering / v.21, no.11, 2011 , pp. 1059-1066 More about this Journal
Abstract
The micro-perforated panel absorber(MPPA) is one of promising noise control elements because of its applicability to extreme environments where general porous materials cannot be used. Since the MPPA is inherently non-porous sound absorber, it can be a good candidate of acoustic protection system of a space launcher. The overall sound pressure level inside payload fairings of commercial launch vehicles is so high(around 140 dB OASPL) that the conventional linear impedance model cannot be directly applied to the design of the acoustic protection systems. In this paper an acoustic impedance models of a micro-perforated panel absorber at high sound pressure environment were reviewed and the use of the impedance on the practical design of MPPAs was addressed. The variation of absorption characteristics of MPPA was discussed according to the design parameters, e.g., perforation ratio, the minute hole diameter, the thickness of MPP and the incident sound pressure level.
Keywords
Acoustic Impedance; Micro-perforated Panel; High Incident Sound Pressure; Acoustic Absorber; Launch Vehicle;
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Times Cited By KSCI : 1  (Citation Analysis)
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