基于最优控制的系统时变非线性参数模糊辨识  

Fuzzy identification of nonlinear parameters based on optimal control theory

作　　者：静大海[1] 刘晓平[1] 

机构地区：[1]北京邮电大学自动化学院,北京100876

出　　处：《系统工程与电子技术》2008年第3期540-543,共4页Systems Engineering and Electronics

基　　金：教育部重点项目资助课题(教重104043)

摘　　要：针对运动状态下结构连接处的时变物理参数对研究结构动态特性与工程实际应用具有重要价值,提出了一种结构连接处时变非线性物理参数辨识方法。该方法利用每个子结构的动力学模型,将结构连接处的非线性恢复力作为模型的输入,利用最优控制理论与模糊数学的方法辨识出结构连接处的非线性恢复力,并应用子结构法计算出结构连接处的响应。最后利用最小二乘法拟合了非线性恢复力。计算出非线性恢复力的时变系数。仿真算例表明了该算法的有效性。Time-varying physical parameters of structure joint have important value for structure dynamics characteristic research and applying in practical engineer, so, an identification method of time-varying nonlinear physical parameters of structure joint is presented. The dynamic mode of every substructure is used and the nonlinear force of structure joint is regarded as an input variable of the mode. The nonlinear force of structure joint is identified by using optimal control theorys and fuzzy math methods. The response of structure joint is computed by substructure methods. The nonlinear force is fitted by least square methods and time-varying physical parameters are computed. Simulation result shows that the method is effective.

关 键 词：非线性系统 时变物理参数 最优控制 模糊数学 

分 类 号：O327[理学—一般力学与力学基础] TB122[理学—力学]