Sliding mode fault-tolerant control for manipulator based on predefined time extended state observers
Chunwu Yin1, Zilan Zhao1, Pei Yi1
1College of Information and Control Engineering, Xi'an university of Architecture and Technology, Xi'an, Shaanxi 710055, China.
Abstract:
Regarding the accurate and fast-tracking control problem of a multi-joint manipulator system under the multiple uncertainties of actuator faults, parameter perturbations, and external disturbances, this paper proposes fault-tolerant control scheme based on a predefined time Extended state observer. First, a novel extended state observer has been designed to estimate the time-varying composite disturbance within a predefined time. Second, a new predefined time integral sliding mode surface and Finite time prescribed performance constraint function are constructed, and a continuous function is introduced to reduce chattering. The Lyapunov stability theory is used to analyze the predefined time stability characteristics of the closed-loop system. Finally, numerical simulations verify the effectiveness of the proposed control method, and the system has strong robustness and high steady-state accuracy, and can withstand actuator failures and other uncertain influencing factors.
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