组合结构结合部动态参数的实验识别方法

Experimental Identification of Dynamic Parameters at Joint of Combined Structure

根据两种不同的试验情况,提出了相应的利用实测传递函数识别组合结构结合部刚度、阻尼参数的方法。给出了识别过程的数学原理,该方法避免了对实测传递函数矩阵求逆运算,有效地防止了测试误差在识别过程中的扩大化。计算机仿真试验表明,本文方法数值计算稳定,识别效果良好。

In this paper, methods used to identify stiffness and damping parameters at joint of combined structure are presented under two different experimental conditions by using frequency response functions (FRF). The mathematical principle of identification is deduced. The inverse operation of high order matrices composed from experimental dynamic data is avoided. And, the distortion caused by inevitable noise of measurement is overcome in process of identification. It is shown that the present methods can be easily programmed and stably calculated. The results of identification are satisfactory.