结构振动模型一类随激励频率变化的物理参数摄动迭代识别方法

A METHOD OF IDENTIFYING AKIND OF STRUCTURAL PYSICAL PARAMETERS VARIABLE WITH THE FREQUENCIES OF EXCITATION

本文研究了结构振动系统的一类随激励频率变化的未知物理参数的识别问题。提出了在一部分系统响应未知的条件下,系统此类未知物理参数的摄动迭代识别方法,及证明了方法的收敛性。并对具有随激励频率变化的未知油膜刚度的转子-支承系统模型进行了识别。识别结果表明,本文方法能很好地识别振动模型的这一类随激励频率变化的未知物理参数,且具有一定的识别精度。

The identification of a kind of structural pysical parameters variable with the frequencies of excitation is studied in this paper. A pertubation method for identifying these parameters when some vibration responses of a structure are unkown is presented and its convergence is proved. The results of identification for a rotor-supports structure model with unknown variable oil-film stiffness show that the method is effective for identifying this kind of pysical parameters of vibration models and with high accuracy.