Numerical Study of Vibro-Acoustic Performance of Composite and Sandwich Shells with Viscoelastic Core

Bo Tong; Xi Zhu; Yong Qing Li; Yan Bing Zhang

doi:10.4028/www.scientific.net/KEM.727.249

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HomeKey Engineering MaterialsKey Engineering Materials Vol. 727Numerical Study of Vibro-Acoustic Performance of...

Numerical Study of Vibro-Acoustic Performance of Composite and Sandwich Shells with Viscoelastic Core

Abstract:

In order to effectively evaluate the acoustic vibration characteristics of viscoelastic sandwich composite cylindrical shell, based on FEM and BEM method, the vibration acoustic radiation of the viscoelastic sandwich panel and metal shell are calculated, and the results agree well with the experimental results. The dynamic mechanical parameters of viscoelastic core are obtained by dynamic thermodynamic experiments and the equivalent principle of temperature and frequency. The finite element method is used to simulate the coupling of water and shell. Finally, the indirect boundary method is used to calculate the radiated sound field under point excitation and the results show that the average and peak value of the acoustic power of the viscoelastic sandwich composite shell is 21.2dB and 46.4dB lower than that of the steel shell. In the range of low frequency,the radiation sound power is sensitive to the change of the layer angle,which is opposite in the range of high frequency. In the range of high frequency,the shear loss of the viscoelastic core is relatively obvious,which is opposite in the range of low frequency.

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Periodical:

Key Engineering Materials (Volume 727)

Pages:

249-256

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.727.249

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Online since:

January 2017

Authors:

Bo Tong*, Xi Zhu, Yong Qing Li, Yan Bing Zhang

Keywords:

Boundary Element Method, Composite Sandwich Shell, Finite Element Method, Vibro-Acoustic, Viscoelastic Material

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* - Corresponding Author

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