Global practical tracking via adaptive outputfeedback for uncertain nonlinear systems with generalized control coefficients

作     者：Shaoli JIN Yungang LIU 

作者机构：School of Control Science and Engineering Shandong University 

出 版 物：《Science China(Information Sciences)》 (中国科学:信息科学(英文版))

年 卷 期：2016年第59卷第1期

页      面：188-200页

核心收录：

学科分类：0711[理学-系统科学] 07[理学] 08[工学] 081101[工学-控制理论与控制工程] 0811[工学-控制科学与工程] 071102[理学-系统分析与集成] 081103[工学-系统工程] 

基　　金：supported by National Natural Science Foundation of China(Grant Nos.61325016 61273084 61233014) Natural Science Foundation for Distinguished Young Scholars of Shandong Province of China(Grant No.JQ200919) the Independent Innovation Foundation of Shandong University(Grant No.2012JC014) 

主　　题：uncertain nonlinear systems function-of-output control coefficients global practical tracking dynamical high-gain adaptive output-feedback 

摘      要：This paper investigates the global practical tracking via adaptive output-feedback for a class of uncertain nonlinear systems with generalized control coefficients. Notably, the system in question has the function-of-output control coefficients and the serious unknowns in the system and the reference signal, and hence is essentially different from the existing closely related literature. To solve the global practical tracking,a high-gain observer is first introduced to reconstruct the unmeasurable system states, and then an adaptive output-feedback controller is designed. It is worth emphasizing that the gains in the designed observer and controller are functions of time and output, for which a novel updating law of the high-gain is introduced to overcome the additional system nonlinearities and the serious unknowns mentioned above. The designed controller is shown such that all the states of the closed-loop system are globally bounded, and furthermore,tracking error will be ultimately prescribed sufficiently small. A numerical simulation is provided to demonstrate the effectiveness of the proposed approach.