用局部点振动数据重构系统物理参数

PHYSICAL PARAMETER IDENTIFICATION TECHNIQUE USING LOCAL MEASUREMENT DATA

本文提出用系统的局部振动测量来识别其物理参数的一种方法。文章首先运用微分方程的算子解法，将描述结构振动的动力学方程转化为由测量点信号表示的输入输出系统参数模型，并建立该模型参数─—系统参数与物理参数间的对应关系，然后运用系统辨识技术识别出该系统参数，最后利用系统参数与物理参数间的映射关系，反推出待识别系统的物理参数。

In the paper,a method for identification of physical parameters using local measurement data is presented.Based on the operator method for solving linear differential equations,the dynamical equations of mechanical systems are converted into an input-output parameter model.The system parameters and the corresponding unknown coefficients in the inputoutput parameter model may be identified by conventional techniques,and then the physical parameters are determined by mapping from the system parameters.A numerical example is given to verify the method presented.