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Shock and Vibration
Volume 2016, Article ID 6354915, 10 pages
http://dx.doi.org/10.1155/2016/6354915
Research Article

Vibration and Damping Analysis of a Multilayered Composite Plate with a Viscoelastic Midlayer

1State Key Laboratory of Mechanical Transmission, Chongqing University, Chongqing 400044, China
2Leshan Vocational & Technical College, Leshan 614000, China

Received 2 June 2016; Accepted 14 August 2016

Academic Editor: Andras Szekrenyes

Copyright © 2016 Haochuan Wan et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Based on the theory of Donnell and Kirchhoff hypothesis and by using the complex constant model of viscoelastic materials, the vibration equations of five-layered constrained damping plate are established. The transfer matrix method (TMM) is improved and used to solve equations. The improved TMM is more effective to solve complex structural vibration. The influence of layer numbers, thickness of each layer, and arrangement of materials on vibration behavior are discussed. It is proved that multilayered plates can more effectively reduce natural frequency and obtain higher structural loss factor. The loss factor increases with the number of whole layers. Symmetrical structure can obtain higher structural loss factor than one-direction structure. Uniform arrangement of viscoelastic materials and constrained materials can obtain higher structural loss factor than nonuniform arrangement. There is different optimum frequency with different material thickness, and the optimum frequency is not dependent from layer numbers.