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fixed-time Anti-Disturbance Average-Tracking for Multi-Agent Systems Without Velocity Measurements

Journal of Systems Science & Complexity 2024年第3期37卷 985-1002页

作者： LI Yuling LIU Chenglin ZHANG Ya CHEN Yangyang Key Laboratory of Advanced Process Control for Light Industry(Ministry of Education) Institute of AutomationJiangnan UniversityWuci 214122China School of Automation Southeast UniversityNanjing 210096China

In this paper,the authors tackle a fixed-time average-tracking problem for multi-agent systems which do not require velocity measurements and are affected by external mismatched and matched *** objective requires the considered agents with second-order dynamics to follow the average value of several time-varying reference signals,each of which is acquired by only one *** of all,the average value is estimated by using a novel distributed average estimator in a fixed ***,an original observer is created to provide estimated values in a fixed time for external mismatched and matched disturbances as well as unmeasured velocities of ***,the authors propose a novel fixed-time anti-disturbance average-tracking protocol with the aid of the observer and a sliding mode *** the end,the feasibility of theoretical analysis is illustrated by some simulation experiments.

关键词： Average-tracking control fixed-time algorithm fixed-time observer mismatched distur-bances multi-agent systems velocity measurements

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Distributed fixed-time attitude coordinated control for multiple spacecraft with actuator saturation

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Chinese Journal of Aeronautics 2022年第4期35卷 292-302页

作者： Han GAO Yuanqing XIA Xiaopu ZHANG Guangchen ZHANG School of Automation Beijing Institute of TechnologyBeijing 100081China

This paper investigates the distributed fixed-time attitude coordinated control problem for multiple spacecraft subject to actuator saturation under the directed topology. First, a distributed fixed-time observer is presented for each follower spacecraft to estimate the leader spacecraft’s states. Compared with the commonly used fixed-time observer, the settling time of the proposed fixed-time observer can be easily adjusted by some free design parameters. Next, a distributed fixed-time control scheme is derived by using the estimates of the leader spacecraft’s states and the adding a power integrator technique. When considering actuator saturation, an auxiliary system is utilized to compensate the saturation. Further, a rigorous theoretical proof is provided to show that the practical fixed-time stability of the closed-loop system is ensured. Finally, simulation results illustrate the benefits and effectiveness of the developed control scheme.

关键词： Multiple spacecraft Distributed attitude control fixed-time observer fixed-time controller Actuator saturation

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fixed-time Stabilization of High-Order Uncertain Nonlinear Systems:Output Feedback Control Design and Settling time Analysis

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系统科学与复杂性学报:英文版 2023年第4期36卷 1351-1372页

作者： GUO Chaoqun HU Jiangping School of Automation Engineering University of Electronic Science and Technology of ChinaChengdu 611731China Yangtze Delta Region Institute(Huzhou) University of Electronic Science and Technology of ChinaHuzhou 313001China

This paper is devoted to stabilizing the high-order uncertain nonlinear system in a fixed time by output feedback ***,a novel settling time solution method is proposed by establishing an indirect double system and using the comparison *** a fixed-time observer and a neural networked based adaptive law are constructed to estimate the state and the unknown disturbance for the high-order uncertain nonlinear ***,a fixed-time output feedback controller is proposed via the homogeneity *** upper bound of the settling time is analyzed for the closed-loop system under the proposed output feedback ***,simulation examples are given to illustrate the effectiveness of the theoretical results.

关键词： fixed-time observer high-order uncertain system homogeneity approach output feedback control settling time

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