文献类型：期刊文献

英文题名：Fixed-time composite robust H₈ tracking control of marine surface vessels based on the barrier Lyapunov function and an event-triggered strategy

作者：Wang, Zhicheng[1];Tian, Xuehong[1,2];Mai, Qingqun[1,2];Liu, Haitao[1,2]

机构：[1]Guangdong Ocean Univ, Sch Mech & Power Engn, Zhanjiang 524088, Peoples R China;[2]Guangdong Ocean Univ, Shenzhen Inst, Shenzhen 518120, Peoples R China

年份：2022

卷号：261

外文期刊名：OCEAN ENGINEERING

收录：SCI-EXPANDED(收录号：WOS:000844327700007)、、WOS

基金：This work was supported by the Key Project of Department of Edu- cation of Guangdong Province [grant number 2021ZDZX1041] , the 2019 ? Chong First-class ? Provincial Financial Special Funds Construc- tion Project [grant number 231419019] , and the Science and Technol- ogy Planning Project of Zhanjiang City [grant numbers 2021A05023 and 2021E05012] .

语种：英文

外文关键词：Fixed-time stability (FTS); Barrier Lyapunov function; Robust H-8; Event-triggered strategy; Marine surface vessels

外文摘要：This paper studies the fixed-time composite robust tracking control problem of a class of marine surface vessel (MSV) systems with uncertainty items and external disturbances. First, the tracking error is restricted within the bounded range by the tan-type barrier Lyapunov function (TT-BLF). Second, a fixed-time disturbance observer (FTDO) is designed to offset the lumped disturbances caused by system uncertainty items and external disturbances. Then, relying on the characteristics of H-infinity control, the error is limited within the L-2 norm bounded by suppressing the interference of the observation error. Furthermore, considering the importance of saving network resources, an event-triggered controller based on relative thresholds is proposed, which guarantees excellent robustness while greatly reducing the communication bandwidth. Finally, it is shown by Lyapunov stability analysis that all error signals of the nonlinear system converge to a small region close to zero in fixed time under the guidance of the robust control law. The effectiveness of the proposed composite robust controller is verified by numerical simulation results.