基于动态输出反馈的不确定NNCS H_∞鲁棒容错控制  

Robust H_∞ Fault-tolerant Control for Nonlinear Networked Control System Based on Dynamic Output Feedback

作　　者：李炜[1] 罗伟[1] 王君[1] 李二超[1] 

机构地区：[1]兰州理工大学电信工程与信息工程学院,甘肃省工业过程先进控制重点实验室,甘肃兰州730050

出　　处：《控制工程》2013年第3期439-446,共8页Control Engineering of China

基　　金：国家自然科学基金项目(60964003);甘肃省自然科学基金项目(096RJZA101);兰州理工大学特色学术梯队基金项目(0950

摘　　要：针对一类具有参数不确定的非线性网络化控制系统,同时考虑网络延时、丢包及有限能量外部扰动的影响,采用动态输出反馈控制策略,基于T-S模糊模型建模,在对时延分段处理的情形下,通过构造适当的增广型Lyapunov-Krasovskii泛函,推证出确保非线性网络化控制系统在执行器或传感器失效故障时分别具有H_∞鲁棒完整性的时滞依赖充分条件,并通过求解LMIs,给出了最优控制器的设计方法。采用动态输出反馈策略,克服了状态反馈在实际工程应用中的局限性而更具现实意义,证明中未进行模型变换又引入了适当的自由权矩阵变量,特别是时延的分段处理,使所得结果具有较少保守性。最后以一个仿真算例验证了文中所述方法的可行性和有效性。For a class of nonlinear networked control system with parameter uncertainties, considering network-induced delay, packet dropout and limited energy disturbances, based on T-S fuzzy model and dynamic output feedback strategy, by using extended Lya- punov-Krasovskii functional, the less conservative delay-dependent H∞ sufficient condition of robust integrity for NCS with failures of actuator or sensor is analyzed on the model of pieeewise time delay. And the fanlt-tolerant optimal controller gain can be obtained by solving several LMIs. The dynamic output feedback strategy overcomes the limitations of the state feedback in engineering applications and has more realistic significance. Because of the introduction of appropriate slack matrix variables, and the technology of pieeewise time delay in the proof, the results have less conservative. Finally, a simulation example illustrates the effectiveness and feasibility of the proposed approach.

关 键 词：网络化控制系统 T-S模糊模型 动态输出反馈 容错控制 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置]