Active fault-tolerant control method for nonlinear electromechanical system

Abstract

The invention discloses an active fault-tolerant control method for a nonlinear electromechanical system. The active fault-tolerant control method comprises the following steps: establishing an uncertainty diagnosis bonding graph model of the system; deducing an analysis redundancy relation and a dynamic model of the system according to the uncertainty diagnosis bonding graph model; designing and optimizing an adaptive threshold based on a particle swarm optimization algorithm to improve the fault detection performance under the parameter uncertainty condition; based on a recursive terminal sliding mode theory, a recursive terminal sliding mode control law, namely a closed-loop control law, of the system is designed, and load position tracking of the system in a healthy state is achieved; aiming at a parameter fault of the system, estimating an unknown parameter fault item in real time by utilizing an adaptive fuzzy system, compensating an estimated value into a control law, and designing an adaptive fuzzy recursive terminal sliding mode control law, namely a fault-tolerant control law, of the system; and when a parameter fault occurs in the system, the closed-loop control law is switched to the fault-tolerant control law, so that active fault-tolerant control on the parameter fault of the system is realized.

Description

technical field [0001] The invention relates to the technical field of fault-tolerant control, in particular to an active fault-tolerant control method of a nonlinear electromechanical system. Background technique [0002] With the rapid development of industrial production, nonlinear electromechanical systems are widely used in aerospace, CNC machine tools, industrial equipment production and other fields as a complex system involving mechanical, electrical and other different energy domains. When the nonlinear electromechanical system is overloaded, over-temperature or external interference, the system parameters may fail. If the failure is not dealt with in time, it will have a great impact on the safe operation of the entire system. [0003] At present, the research on fault-tolerant control is mainly divided into passive fault-tolerant control and active fault-tolerant control. Passive fault-tolerant control considers the robustness of the controller, so that the syste...

AI Technical Summary

Problems solved by technology

Since the faults caused by parameter changes are unavoidable in the actual system operation, and serious parameter faults may lead to catastrophic consequences for the system, it is urgent to quickly and accurately realize active fault-tolerant control under parameter faults in nonlinear electromechanical systems of

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