振动系统模型参数识别与修改

THE PARAMETER IDENTIFICATION AND MODIFICATION OF A VIBRATION SYSTEM MODELLING

本文根据振动系统的输入输出相关函数方程,从理论上阐明了模态参数的时域识别方法.将相关函数方程转换到频域,直接给出分析模型的系数矩阵,从而得到一个较好的初始分析模型.利用识别模态或实验模态对相关函数方程进行坐标变换,在模态坐标系对初始分析模型进行修改.最后返回物理坐标系,并给出修改量计算公式.

This paper clarifies theoretically a method in time domain about the model parameter identification on the base of the input-output correlevant function equation of a vibration system. It gives out the coefficient matrix of the analytical model directly. The method uses an identification model or a measured model to process coordinate transformation for the correlevant function equation,and modifies the initial analytical model in the modelling coordinate. A corresponding modification formula is provided for returning to the physical coordinate.