Abstract
In this paper, a hybrid fault-tolerant control method with off-line design and online scheduling is proposed for NCS with actuator faults, random delay, and external finite energy disturbance. The problem of less conservatism of robust generalized H2/H∞ hybrid fault-tolerant control is studied. Firstly, a closed-loop fault model of the system with random delay parameters was established according to the Bernoulli 0-1 distribution; all possible prior faults are divided into a few intervals according to certain rules, and then an interval fault-tolerant controller is designed off-line according to the prior faults of each interval. Secondly, when the fault is estimated online, the corresponding interval fault-tolerant controller is called through the scheduling mechanism to achieve rapid fault tolerance of prior faults within the interval and mitigate the impact of other faults within the interval, which provides a guarantee for subsequent safe reconstruction control. Finally, the effectiveness of the proposed method is verified by Matlab simulation.
Highlights
With the development of science and technology, a networked control system (NCS) has been widely used in aerospace, chemical industry, and other fields due to its convenient operation and strong integrated control
As one of the important components of an NCS, the actuator is susceptible to the influence of the external environment and long-term operation, which will inevitably affect the normal operation of the system, resulting in poor product quality and even system collapse. erefore, fault-tolerant control for NCS actuator faults is a high concern in industry
An interval fault-tolerant control method with less conservatism is proposed based on the hybrid control idea
Summary
With the development of science and technology, a networked control system (NCS) has been widely used in aerospace, chemical industry, and other fields due to its convenient operation and strong integrated control. Passive fault-tolerant control (PFTC) [1,2,3] has been studied by a large number of scholars due to its advantages of simple design. The active fault-tolerant control (AFTC) [4,5,6] method, which can design the controller online for each fault, is discussed. In order to further improve the reliability of fault-tolerant control, in recent years a few scholars have proposed a hybrid fault-tolerant control method combining their respective advantages [7,8,9,10,11]. Jiang and Yu[7] compare the advantages and limitations of active and passive fault-tolerant control methods and verifies them in the UAV fault calculation example. Yu and Jiang [9] make use of the advantages of active and passive control to establish a hybrid control strategy for a UAV with control failure. e robustness of PFTC guarantees the stability of the system, and provides favorable conditions for fault detection and diagnosis
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