Exact uncertainty compensation of linear systems by continuous fixed-time output-feedback controller  

作　　者：SHI Shang ZHANG Guosheng MIN Huifang HU Yinlong SUN Yonghui 

机构地区：[1]College of Energy and Electrical Engineering,Hohai University,Nanjing 211100,China [2]School of Automation,Southeast University,Nanjing 234299,China [3]School of Automation,Nanjing University of Science and Technology,Nanjing 210094,China

出　　处：《Journal of Systems Engineering and Electronics》2022年第3期706-715,共10页系统工程与电子技术（英文版）

基　　金：This work was supported by the National Natural Science Foundation of China(62003131,62073121,62173125);the Natural Science Foundation of Jiangsu Province(BK20200520).

摘　　要：This paper studies the fixed-time output-feedback control for a class of linear systems subject to matched uncertainties.To estimate the uncertainties and system states,we design a composite observer which consists of a high-order sliding mode observer and a Luenberger observer.Then,a robust output-feedback controller with fixed-time convergence guarantee is constructed.Rigorous theoretical proof shows that with the proposed controller,the system states can converge to zero in fixed-time free of the initial conditions.Finally,simulation comparison with existing algorithms is given.Simulation results verify the effectiveness of the proposed controller in terms of its fixed-time convergence and perfect disturbance rejection.

关 键 词：linear system output feedback matched uncertainty fixed-time control OBSERVER 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置]