基于材料参数随机性的粘弹性结构振动特性分析

VIBRATION ANALYSIS OF VISCOELASTIC STRUCTURES BASED ON RANDOMNESS OF MATERIAL PARAMETER

基于粘弹性材料的随机性对粘弹性结构的振动特性进行了分析。研究了模量模型的随机性对结构固有频率和模态损耗因子的影响。在模型的随机性中分别考察了常复数模型、Kelvin_Voigt模型和三参数标准流变学模型。结果表明 ,粘弹性材料参数的随机性对粘弹性结构的模态损耗因子的影响还是比较大的。因此 ,对粘弹性结构采取随机分析是非常必要的。

The frequency and damping of viscoelastic structure are alaysed based on randomness of viscoelastic material parameters.The influences of model randomness on the resonant frequency and the modal loss factor of structure are studied.As regards the model randomness,model with constant complex modules,Kelvin_Voigt model and standard rheologic model with three parameters are considered respectively.Numerical examples show that the randomness of viscoelastic material parameter obviously influences the structural vibration.Therefore,it is necessary to carry out the random analysis for viscoelastic structure vibrations.