Sound Transmission Loss of Truncated Conical Shells with Porous Materials

Document Type : Research Article

Authors

Faculty of Mechanical Engineering, K.N. Toosi University of Technology, Tehran, Iran

Abstract

A theoretical model is proposed to study the sound transmission loss of a truncated conical shell with a porous layer. The isotropic thin-walled conical shell is excited by an oblique incident plane sound wave, which impinges on the outer surface of the shell. The governing equations of the shell motion are obtained by Love’s theory, and a convergent power series solution is applied to obtain the exact displacements of the shell. An equivalent fluid model based on Biot’s theory is considered to describe the wave propagation in the porous material. The model results are firstly validated against the results of prior studies. Then, the effects of several design parameters such as different boundary conditions at the ends of the shell, cone angle, incident sound wave angle and material properties of the shell are studied on the characteristics of the sound transmission loss. The proposed model can provide an effective tool in the acoustic design stage of the truncated conical shells. In addition, the transmission loss is obtained in the presence of the porous layer with two different configurations. The results generally show the desirable performance of the porous layer in the sound insulation ability.
 

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References

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Amirkabir Journal of Mechanical Engineering
Volume 53, Issue 2
May 2021
Pages 923-942

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