摘要
本文提出了基于脉冲响应数据的ARMA法建模以及模态参数识别的新方法。该方法利用单位脉冲响应函数与ARMA模型G reen函数等价的特点,通过脉冲响应函数来估计系统响应的自相关系数,然后建立推广的Yu le-W alker方程以求得ARMA模型自回归系数并进行参数识别。最后通过算例,对一个模拟系统进行了参数识别,对采样频率、识别精度、模型阶数之间的影响规律进行了分析。
In this paper, a new method of ARMA model building and system identification by using impulse time response is suggested. In the new method, the equivalence of Green function in ARMA model with the system＇s response function of impulse is considered. The auto-correlation coefficient of the system is estimated according to the system＇s impulse response function. An extended Yule-Walker equation is established to compute the auto-regressive coefficient of ARMA model and estimate the system model parameters. The results show that the new method is effective. In the end of paper, the effect of simple frequency and rank of model on the accuracy of results is discussed.
出处
《地震工程与工程振动》
CSCD
北大核心
2006年第5期167-171,共5页
Earthquake Engineering and Engineering Dynamics
