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Robust adaptive fault-tolerant control system for non-affine nonlinear flight control system

A non-affine nonlinear, robust adaptive technology, applied in the field of flight control systems, can solve the problem of few research results on fault-tolerant control of non-affine nonlinear systems

Active Publication Date: 2017-02-22
SHANDONG JIELIER FERTILIZER CO LTD
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Problems solved by technology

[0005] The purpose of the embodiments of the present invention is to provide a robust adaptive fault-tolerant control system for non-affine nonlinear flight control systems, aiming to solve the problem that there are few research results related to fault-tolerant control of non-affine nonlinear systems

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  • Robust adaptive fault-tolerant control system for non-affine nonlinear flight control system

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specific Embodiment

[0096] 1. Problem description:

[0097] Consider the following non-affine nonlinear system:

[0098]

[0099] where: x∈R r is the state vector, u∈R n is the input vector, d∈R r is an unknown and bounded external disturbance vector, and f(.) is a nonlinear function. In this invention, the failure of the actuator is taken as the research situation. Without considering the dynamics of the actuator, the actuator failure of each input channel can be obtained from the previous chapters The latter fault model can be expressed as:

[0100]

[0101] where σ i is an unknown failure factor, The known failure factor σ defined by i The maximum and minimum values ​​of σ i = 1 means no fault occurs, so the control input has actuator failure fault can be expressed as:

[0102] u(t)=[u 1 (t), u 2 (t),...,u n (t)] T =Σu c (t) (5.3)

[0103] where Σ=diag(σ 1 ,…,σ n ), so the non-affine nonlinear system (5.1) under fault can be expressed as:

[0104]

[0105] Equation (...

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Abstract

The invention discloses a non-affine non-linear flight control system robust adaptive fault-tolerant control system used for a non-linear system with parameters in a non-affine mode. An observer has relatively idea robustness on the situation that the parameters change in a large range. Fault information and disturbance information are implied in the observer, and then a fault-tolerant controller is dynamically designed on the basis of the observer. Due to the non-affine non-linear system, the controller is not easy to design, the non-affine non-linear system approximates to an affine non-linear system with time-varying parameters, and the parameters needing to be known are estimated online through a filter. By means of the non-linear flight control system, effectiveness of a method is verified, and robust adaptive fault-tolerant control of the non-affine non-linear flight control system can be achieved. Robust adaptive fault-tolerant control of the non-affine non-linear flight control system is achieved and applied in the flight control system, and a simulation result displays effectiveness of the method.

Description

technical field [0001] The invention belongs to the technical field of flight control systems, and in particular relates to a robust adaptive fault-tolerant control system for a non-affine nonlinear flight control system. Background technique [0002] At present, model-based nonlinear control has made great progress in theory and application, such as feedback linearization, sliding mode control, inversion control, etc. Literature [155-156] made a corresponding summary and induction on some main nonlinear control methods at present. Because adaptive technology can estimate unknown parameters online, it is widely used in combination with many nonlinear control methods to design fault-tolerant control. However, adaptive control requires the estimated parameters and control inputs to be in the affine form, that is, the uncertain parameters and control inputs must be in the explicit form, or the relationship with the state variables is a linear relationship. In the flight contr...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B13/04G05D1/10G05D1/08
Inventor 周洪成胡艳陈存宝
Owner SHANDONG JIELIER FERTILIZER CO LTD
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