闭环辨识条件下迭代激励信号设计方法  

Iterative excitation signal design for closed-loop system identification

作　　者：宗群[1] 窦立谦[1] 孙连坤[1] 刘文静[1] 

机构地区：[1]天津大学电气与自动化工程学院,天津300072

出　　处：《系统工程与电子技术》2008年第8期1530-1534,共5页Systems Engineering and Electronics

基　　金：国家自然基金(60574055);高校博士学科点专项科研基金(20050056037);天津市重点攻关项目(06YFGZGX01700)资助课题

摘　　要：针对闭环系统辨识中激励信号的优化选择问题,提出一种迭代的优化激励信号设计方法。以优化控制的性能指标作为激励信号选择的目标函数,考虑闭环辨识的鲁棒性稳定性,以及激励信号、控制信号和输出信号的能量限定,求取激励信号的优化能量谱,并以迭代的方法逐步选择优化的激励信号和闭环辨识系统模型,从而得到满足闭环系统性能的系统模型和相应的激励信号。仿真验证结果表明,使用该方法得到的激励信号去激励闭环系统,进行模型辨识,能够有效提高辨识模型的准确性。An iterative excitation signal design method is proposed to select an optimal signal for closed-loop system identification. The control performance criterion is used as the objective function of optimal excitation signals, and the robust stability of closed-loop identificaiton and the power constraints of excitaion signals, con- trol signals and output signals are considered. Based on these, the optimal excitation signal design problem is formulized and the power spectrum of excitation signals is solved. Finally, an iterative method is used to solve the optimal excitation signal and the identify system model. Simulation result shows that model quality by closed-loop identification is improved by using the excitation signal optimal method proposed.

关 键 词：闭环辨识 激励信号 激励信号优化设计 

分 类 号：N945.14[自然科学总论—系统科学]