非线性参数识别的相关积分方法及其应用

使用相关积分方法解决单自由度非线性系统的参数识别问题。利用相关积分方法的滤波特性可以有效地抑制测量信号中的噪声影响，提高参数估计的精度。同时可以分别建立非线性阻尼和刚度参数的线性识别方程．实现两类参数的分离识别，有利于弱非性项的参数估计。将这一方法用于贮箱内液体晃动等效力学模型参数的试验确定问题，解决了由于采用防晃装置而产生的非线性晃动阻尼的参数识别问题。

The Correlative Integral method for Identifying the Nonlinear Parameters and Its Applications

In this paper the correlative Integral method is used to slove the parameter identification problems of a SDOF nonlinear system. Using the filter property of correlative Integral, the effect of noise in measured signal may be effectively restrained and the precision of parameter estimation is raised. Simultaneously, the linear identifying equations of the nonlinear damping and stiffness parameters may be suggested separately, and the separating identification of two kinds of parameters is realized, it is advanta-geous to the parameter estimation of weak nonlinear terms. In the paper, this method is used to the problems of determining the parameters of the equivalent mechanical model of liquid sloshing in a tank by tests,and slove the parameter identification problem of the nonlinear sloshing dampings which are produced by using the sloshing suppression device.