Dynamic parameters measurement of damping materials under hydrostatic pressure based on a hybrid numerical-analytical method

被引：0
|
作者：
Tao M. [1 ]
Jiang K. [1 ]
机构：
[1] School of Mechanical Engineering, Guizhou University, Guiyang
来源：
Zhendong yu Chongji/Journal of Vibration and Shock | 2016年 / 35卷 / 07期
关键词：
Damping material; Dynamic parameters; Hydrostatic pressure; Numerical-analytical method;
D O I：
10.13465/j.cnki.jvs.2016.07.015
中图分类号：
学科分类号：
摘要：
For viscoelastic dynamic parameters measurement of damping materials under hydrostatic pressure, a hybrid numerical-analytical method was developed. Firstly, two different samples of sound absorption coatings containing cylindrical holes with two different radii were tested in order to obtain the two different measured complex reflection coefficients under hydrostatic pressure. Secondly, the complex reflection coefficients were calculated with FEM based on the structural deformation simulated with the FE method. Then, using the measured and the simulated complex reflection coefficients simultaneously, two nonlinear equations were established. Using Newton iteration method, the nonlinear equations were solved, the viscoelastic dynamic parameters including complex elastic modulus and complex Poisson's ratio were obtained. Then, two samples made with polyurethane were tested in a water-filled acoustic-pipe, and the effects of hydrostatic pressure on the viscoelastic dynamic parameters were analyzed and summarized. Finally, the reflection coefficient of another different sound absorption coating tested under hydrostatic pressure was measured and compared with the simulated reflection coefficient calculated with the measured viscoelastic dynamic parameters, the correctness of the proposed method was verified. © 2016, Editorial Office of Journal of Vibration and Shock. All right reserved.
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页码：96 / 101
页数：5
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