Dynamic parameters measurement of damping materials under hydrostatic pressure based on a hybrid numerical-analytical method
Tao Meng Jiang Kun
1. School of Mechanical Engineering, Guizhou University, Guiyang 550025
2. State Key Laboratory of Mechanical System and Vibration, Shanghai Jiao Tong University, Shanghai 200240
Abstract:The viscoelastic dynamic parameters measurement of damping materials under hydrostatic pressure based on a hybrid numerical-analytical method has been developed. First, two different samples of sound absorption coatings which contain cylindrical holes with two different radii will be tested in order to obtain the two different measured complex reflection coefficient under hydrostatic pressure. Second, the simulated complex reflection coefficient should be carried out based on the structural deformation calculated by using the FEM method. Then, taking account of the measured and the simulated complex reflection coefficients simultaneously, two nonlinear equations will be formed. Using the Newton iteration method to solve the nonlinear equations, the viscoelastic dynamic parameters including the complex elastic modulus and the complex Poisson’s ratio will be obtained. Then, two samples made by the polyurethane have been tested in the water-filled acoustic-pipe, and the effect of hydrostatic pressure on the viscoelastic dynamic parameters has been analyzed and summarized. Finally, the reflection coefficient of another different sound absorption coating which has been tested under hydrostatic pressure, compared with the simulated reflection coefficient from which the viscoelastic dynamic parameters is measured above, demonstrates that the present method is correct.
陶 猛 江 坤 . 基于数值-解析方法测量静压条件下阻尼材料动态力学参数[J]. 振动与冲击, 2016, 35(7): 96-101.
Tao Meng Jiang Kun . Dynamic parameters measurement of damping materials under hydrostatic pressure based on a hybrid numerical-analytical method. JOURNAL OF VIBRATION AND SHOCK, 2016, 35(7): 96-101.
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