Sound absorption of a microperforated panel backed by an L-type division cavity

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (16) : 256-260.

GAI Xiaoling1, LI Xianhui1, XING Tuo1, ZHANG Bin1, CAI Zenong1, WANG Fang1, HAN Yu2

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Abstract

To improve the sound absorption ability of a single-layer microperforated panel (MPP), an MPP backed by an L-type division cavity was designed.Based on the MPP theory and electro-acoustical equivalent circuit principle, the sound absorption model of a microperforated panel backed by a two-cavity L-type division cavity was built.Simulation and experiment results show that that an MPP with a designed cavity structure has better sound absorption performance and a broader absorption bandwidth than an MPP with a single-cavity structure.This structure is extended to N-cavity segmentation.The experimental results are in agreement with the numerical results.

Key words

Microperforated panel / Division cavity / Absorption coefficient / Resonance frequency / Low frequency broadband sound absorption structure

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GAI Xiaoling1, LI Xianhui1, XING Tuo1, ZHANG Bin1, CAI Zenong1, WANG Fang1, HAN Yu2. Sound absorption of a microperforated panel backed by an L-type division cavity[J]. Journal of Vibration and Shock, 2018, 37(16): 256-260

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