静水压力下高分子材料黏弹性动力学参数测量

提出测量静压下高分子材料黏弹性动力学参数方法。分别制作均匀实心覆盖层及圆柱空腔覆盖层样品，测量实心覆盖层复反射系数计算复纵波波数，测量圆柱空腔覆盖层复反射系数，结合圆柱空腔结构变形，利用圆柱管中轴对称波特征方程计算复剪切波波数，综合复纵波波数与复剪切波波数计算静压下复杨氏模量及复泊松比。对橡胶材料进行声管测试，分析、总结静压对黏弹性动力学参数影响规律。测量某吸声覆盖层静压下反射系数，并与用实测材料参数计算的反射系数进行比较，验证方法的可靠性。

Measurement of viscoelastic dynamic parameters of polymer materials under hydrostatic pressure

The measurement method of viscoelastic dynamic parameters of polymer materials under hydrostatic pressure has been developed. Two different samples of sound absorption coatings, where one is solid and the other contains cylindrical-hole, will be utilized in the measurement. When the reflection coefficient of solid sample is tested, the complex longitudinal wavenumber can be calculated. Besides, the axisymmetric wavenumber can be obtained by measuring the reflection coefficient of cylindrical-hole sample, together with the deformation of cylindrical hole, the complex transverse wavenumber can be computed by solving the characteristic equation of axisymmetric wavenumber, and the complex elastic modulus and the complex Poisson’s ratio can be calculated easily. Then, a rubber sample has 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 sound absorption coating under hydrostatic pressure has been tested, compared with the simulated reflection coefficient which is from the measured viscoelastic dynamic parameters, demonstrates that the present method is correct.