Study of the Effects of Various Boundary Conditions on the Acoustical Treatments of Double-Panel Structures Lined with Poroelatic Materials

Journal of Simulation and Analysis of Novel Technologies in Mechanical Engineering

مقاله 1، دوره 3، شماره 2، آذر 2010، صفحه 1-12   

نوع مقاله: Persian

نویسندگان

M.H. Shojaeefard¹؛ R. Talebi^{* 2}؛ R. Ahmadi³؛ M. Amirpour Molla⁴

¹Professor, Iran University of Science and Technology.

²Assistant Professor, Iran University of Science and Technology

³PhD Student, Iran University of Science and Technology

⁴M.Sc. Student, Iran University of Science and Technology

چکیده

In this paper, the acoustical treatment of double-panel structures lined with poroelatic materials is predicted using analytical method in order to study the effective usage of the various boundary conditions of porous layer and to identify the effective parameters on the transmission loss of the multilayer systems. Therefore, inertia and viscous coupling along with thermal and elastic coupling should be considered in transfer stress dynamic and stress-strain relationships for an elastic porous material based on Biot theory. Then, the governing equations of the wave propagation in an elastic porous material are briefly considered and the general forms for the stresses and displacements within the porous material are given. Applying various boundary conditions and solving these equations with Matlab code simultaneously, the transmission loss of these structures is calculated. The results from the analytical method are compared with the SEA madel and the experimental data with excellent agreement is observed. Finally, the influence of effective parameters of this structure with various boundary conditions on the transmission loss of the multilayer systems is studied. The results have been shown that the transmission loss of double-panel structures lined with a layer of porous material can depend critically on the method of mounting the porous layer to the facing panel.

کلیدواژه‌ها

Double-panel structures؛ Poroelastic layer؛ Transmission loss؛ Boundary Condition؛ Statistical Energy Analysis(SEA)

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