Nonlinear system fuzzy fault-tolerant control method based on adaptive observer

A nonlinear system, fault-tolerant control technology, applied in the direction of adaptive control, general control system, control/regulation system, etc., can solve the problem that the problem of fault-tolerant control of nonlinear system has not been fully studied

Active Publication Date: 2021-11-09
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

However, the problem of fault-tolerant control for nonlinear systems with state constraints has been understudied so far because it is more challenging to compensate for faults while maintaining the state constraints

Method used

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  • Nonlinear system fuzzy fault-tolerant control method based on adaptive observer
  • Nonlinear system fuzzy fault-tolerant control method based on adaptive observer
  • Nonlinear system fuzzy fault-tolerant control method based on adaptive observer

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Embodiment Construction

[0028] Specific embodiments of the present invention will be described below in conjunction with the accompanying drawings, so that those skilled in the art can better understand the present invention. It should be noted that in the following description, when detailed descriptions of known functions and designs may dilute the main content of the present invention, these descriptions will be omitted here.

[0029] figure 1 It is a principle schematic diagram of a specific embodiment of the fuzzy fault-tolerant control method for a nonlinear system based on an adaptive observer in the present invention.

[0030] Such as figure 1 As shown, the present invention relates to adaptive observer design, state estimator design and fuzzy fault-tolerant controller design for nonlinear systems.

[0031] Consider the following nonlinear system:

[0032]

[0033] where y∈R and u(t)∈R denote the output and input of the system, respectively, with Indicates the state of the system an...

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Abstract

The invention discloses a nonlinear system fuzzy fault-tolerant control method based on an adaptive observer, and relates to the design of an adaptive observer containing a nonlinear system, the design of a state estimator and the design of a fuzzy fault-tolerant controller. The invention designs an estimator based on a self-adaptive sliding mode for a fault problem in the non-linear system. Aiming at a state constraint problem of the nonlinear system, a logarithm-based Lyapunov function is constructed; in order to realize tracking control, a fuzzy fault-tolerant controller is designed. According to the method, the problems of fault and state estimation and tracking control of the nonlinear system under fault and state constraints can be effectively solved.

Description

technical field [0001] The invention belongs to the technical field of fuzzy fault-tolerant control, and more specifically relates to a fuzzy fault-tolerant control method for a nonlinear system based on an adaptive observer. Background technique [0002] In practical applications, almost all systems are nonlinear systems due to the inherent nonlinear characteristics of the system or the existence of nonlinear components. In recent years, nonlinear systems have attracted the attention of many researchers. Usually, in industrial control, the failure of actuators or sensors often occurs due to temperature changes, aging of system components, etc. Due to the existence of these failures, the performance of the control system may deteriorate or cause system instability. Especially in recent years, research on nonlinear system faults has also received attention. [“Decentralized adaptive NN output-feedback fault compensation control of nonlinear switched large-scale systems with ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B13/04
CPCG05B13/042
Inventor 李猛李露陈勇苗朕海刘越智
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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