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Extended State Observer Based on ADRC of Linear System with Incipient Fault
Xingxing Hua,Da-Rong Huang,Shenghui Guo 제어·로봇·시스템학회 2020 International Journal of Control, Automation, and Vol.18 No.6
Owing to the fact that it is difficult to find the incipient fault and it is hard to deal with the disturbance, an extended state observer (ESO), which is based on the linear time invariant system is designed and analyzed. This method can effectively separate incipient fault as a new state variable from the disturbance. By using coordinate transformations, the original system is decoupled into two subsystems. Especially, an adaptive observer of faulty system is designed for the one subsystem with the incipient fault but not relevant to the disturbance, and an extended state observer (ESO) based on active disturbance rejection control (ADRC) is designed for the other one which not only has the disturbance but also the incipient fault. Two simulation results are presented to show the effectiveness of the presented methods.
Fault Diagnosis and Optimal Fault-Tolerant Control for Systems with Delayed Measurements and States
Juan Li,Hong-Wei Gao,Peng Zhang,Da-Rong Huang 제어·로봇·시스템학회 2012 International Journal of Control, Automation, and Vol.10 No.1
This note deals with the problems of fault diagnosis and fault-tolerant control for systems with delayed measurements and states. The main contribution consists in two aspects. First, by solving the Riccati equation and Sylvester equation, an optimal fault-tolerant control law is designed for systems with delayed measurements and states. The existence and uniqueness of the optimal fault-tolerant control law are proved. Second, the physically unrealizable problem of the optimal fault-tolerant con-trol law is solved by proposing a novel fault diagnoser for systems with delayed measurements and states. Finally, a numerical example is given to demonstrate the feasibility and validity of the proposed schemes.