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Research on Intelligent Fault Diagnosis and Fault-tolerant Control for Affine Nonlinear Systems

Author: HouPeng
Tutor: ChenXueBo
School: Liaoning University of Science and Technology
Course: Power Electronics and Power Drives
Keywords: affine nonlinear systems fault diagnosis neural network fault-tolerant control
CLC: TP13
Type: Master's thesis
Year: 2012
Downloads: 39
Quote: 0
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Abstract


: The reliability of control systems is the key to operate normally in the running of control systems. At present, the demands for plant reliability and safety are higher and higher, not only from the point of safety but also from economic benefit. However, these demands are satisfied difficultly because of existence of nonlinearity besides uncertainty and external disturbances in the practical engineering systems. So it is meaningful to study the problem of fault diagnosis and fault-tolerant control for nonlinear systems.The problems of fault diagnosis and fault-tolerant control for nonlinear systems are the advanced objectives, and this dissertation researches the problems of fault diagnosis and fault-tolerant control for a class of affine nonlinear system deeply, and the main work and contributions include: The problems of fault diagnosis and active fault-tolerant control for a class of affine nonlinear systems were discussed. Firstly, in different environment of relative degree, the design problem of the observer was proposed by means of diffeomorphism transformation. Secondly, the design method of the observer based on the fault function provided by RBF neural network was proposed for uncertain nonlinear systems with unmeasured states. At last, the design method of the active fault-tolerant controller was proposed by using fault function provided by RBF neural network. The reconfigured fault-tolerant controller can compensate for the influence of faults and keep closed-loop system to remain uniformly ultimately bounded in the case of failure. Simulation results indicate that the proposed methods are effective.

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CLC: > Industrial Technology > Automation technology,computer technology > Automated basic theory > Automatic control theory
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