复模态参数的加权识别法

IDENTIFICATION OF COMPLEX MODAL PARAMETERS USING WEIGHTING FUNCTION

本文研究多模态的复参数识别问题,提出了新的识别方法,在 IBM-PC 与 B·K 动态分析仪上编制了复模态参数识别软件。文中给出了它的迭代方程组,其中频响函数的实部和虚部为分离形式。为了改善参数识别结果,引入了加权函数。并建议以频响函数的各频率点的信噪比高低为原则来构造加权函数。文中例子证明了本文提出的加权识别法的有效性。

This paper deals with the identification of complex modal parameters of closely- coupled modes.A new method for identification is presented.And a software based on IBM PC computer and B.K 2034 dynamic analyzer has been built up.Its iterating equation-set is presented,in which the real part and the imaginary part of the frequ- ency response functions are separated.To improve the quality of the estimated modal parameters,a weighting function,which is suggested to be constructed in the light of signal-noise ratio of the identified frequency response function at each frequency point,is introduced.The efficiency of the software is verified by several examples.