Sound absorption and transmission through flexible micro-perforated panels backed by an air layer and a thin plate

The Journal of the Acoustical Society of America
Teresa BravoCédric Pinhède

Abstract

This paper describes theoretical and experimental investigations into the sound absorption and transmission properties of micro-perforated panels (MPP) backed by an air cavity and a thin plate. A fully coupled modal approach is proposed to calculate the absorption coefficient and the transmission loss of finite-sized micro-perforated panels-cavity-panel (MPPCP) partitions with conservative boundary conditions. It is validated against infinite partition models and experimental data. A practical methodology is proposed using collocated pressure-velocity sensors to evaluate in an anechoic environment the transmission and absorption properties of conventional MPPCPs. Results show under which conditions edge scattering effects should be accounted for at low frequencies. Coupled mode analysis is also performed and analytical approximations are derived from the resonance frequencies and mode shapes of a flexible MPPCP. It is found that the Helmholtz-type resonance frequency is deduced from the one associated to the rigidly backed MPPCP absorber shifted up by the mass-air mass resonance of the flexible non-perforated double-panel. Moreover, it is shown analytically and experimentally that the absorption mechanisms at the resonances are...Continue Reading

References

Feb 12, 2009·The Journal of the Acoustical Society of America·Masahiro Toyoda, Daiji Takahashi
Sep 11, 2009·The Journal of the Acoustical Society of America·Christophe LangrenneAlexandre Garcia

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Citations

Nov 5, 2013·The Journal of the Acoustical Society of America·Teresa BravoCédric Pinhède
Dec 1, 2013·The Journal of the Acoustical Society of America·Thomas HerdtleRonald W Gerdes
Jan 21, 2014·The Journal of the Acoustical Society of America·Jiancheng TaoXiaojun Qiu
Aug 7, 2014·The Journal of the Acoustical Society of America·Xiang YuJean-Louis Guyader
Jan 3, 2016·The Journal of the Acoustical Society of America·Masahiro ToyodaKimihiro Sakagami
Mar 3, 2020·The Journal of the Acoustical Society of America·Xianhui LiXiaoling Gai

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