【摘要】 用Monte-Carlo法对一个和两个自由度随机结构的频响函数统计特性进行了研究。数值计算结果表明,对于单自由系统,考虑质量和刚度的随机将削弱频响函数的峰值;而在2个自由度的体系中,质量和刚度的小变异,会给频响函数带来大的突变,这是按照灵敏度的方法所不能预示的,也是试验测试中应该引起注意的。更多还原

【Abstract】 The statistical characteristics of frequency response functions of single and two degrees of freedom structures with uncertain physical parameters are obtained by using Monte-Carlo method. The numerical results show that the peak value of frequency response functions will be weakened for single degree of freedom system, when randomness of mass and stiffness is to be considered; and small variation of mass and stiffness will lead to sudden change of frequency response functions in two degrees of freedom system. These cannot usually be gained by method of sensitivity, and must be regarded in tests.更多还原