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The Semi-Empirical and Empirical Models for Predicting Sound Absorption Coefficients for a Novel Porous Laminated Composite Material

Department of Power Mechanical Engineering, National Tsing Hua University, Hsinchu 30043, Taiwan ROC

Rongshun Chen

Made of polymer, metal, and polymer fibers of low melting point, a porous laminated composite material (PLCM) exhibits very highly sound absorption coefficient over the frequency of 500-2000 Hz with a relatively thin structure. In this paper we present two models to predict sound absorption characteristics for a PLCM. Firstly, we derive a semi-empirical model in which the flow resistivity of the PLCM is a function of the fibrous surface area under the assumption that most energy loss is due to the viscous loss consumed in the fibrous surface of a PLCM. Secondly, we propose an empirical model to predict the characteristic impedance and the propagation constant, which then is employed to determine the sound absorption coefficient for a new PLCM. Numerical predictions have been performed and experiments have been conducted to validate the two proposed models.

Key Words: Semi-empirical model • empirical model • porous laminated composite material • sound absorption coefficient • flow resistivity • fibrous surface area

Journal of Vibration and Control, Vol. 9, No. 11, 1249-1263 (2003)
DOI: 10.1177/1077546304030685


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