基于声管测量的粘弹性介质动态力学参数辨识方法

摘要

提出一种通过声管测量粘弹性覆盖层反射系数，识别粘弹性动态力学参数的方法。分别设计实心覆盖层和圆柱空腔覆盖层，测量实心覆盖层的反射系数可以计算得到粘弹性介质的复纵波声速，测量圆柱空腔覆盖层的反射系数、并结合求解粘弹性圆柱管的特征方程可以获得粘弹性介质的复剪切波声速，进而计算复杨氏模量和复泊松比。最后，对某种橡胶材料进行了声管测试，并对粘弹性动态力学参数的识别结果进行了分析和讨论。%An identification method of viscoelastic material dynamic parameters based on the reflection coefficient measurement of viscoelastic layer in an acoustic-pipe was developed.Two different types of layers,one being solid and the other containing a cylindrical-hole,were taken for parameters identification.The complex longitudinal sound were speed of viscoelastic material was calculated through the reflection coefficient measurement of the solid sample.Besides,combining the coefficient measurement of the cylindrical-hole sample and solving the characteristic equation of a viscoelastic-tube, the complex transverse sound wave speed of viscoelastic material was identified.Then,the complex Young's modulus and the complex Poisson's ratio were calculated easily.Finally,a rubber sample was tested an the acoustic-pipe,and the identification results of the rubber dynamic parameters were analyzed and discussed.