Nonlinear aircraft robust control method considering actuator saturation

A control method and non-linear technology, applied in the field of flight control, can solve problems such as limited processing effect, achieve the effect of reducing design difficulty, simple and flexible design, and good trajectory tracking effect

Inactive Publication Date: 2021-10-15
NORTHWESTERN POLYTECHNICAL UNIV +1
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Problems solved by technology

However, the processing effect of this indirect processing method is limited, and a better choice is to adopt the direct method, that is, consider the saturated nonlinearity, and use the nonlinear control theory to design the nonlinear controller
This method can achieve better control effect, but it needs to completely abandon the classic linear controller often used in engineering

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  • Nonlinear aircraft robust control method considering actuator saturation
  • Nonlinear aircraft robust control method considering actuator saturation
  • Nonlinear aircraft robust control method considering actuator saturation

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Embodiment Construction

[0049] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

[0050] The aircraft model for which the present invention considers actuator saturation is as follows:

[0051]

[0052] in, is the state of the aircraft system, and the system output is The control input is is the system matrix, is the input matrix, is a nonlinear function vector related to x, is the output matrix, is an unknown disturbance, and the expected output is denoted as y d , the ...

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Abstract

The invention relates to a nonlinear aircraft robust control method considering actuator saturation, and belongs to the field of flight control. The method comprises the following steps: decomposing an aircraft model into a linear main system considering all interferences and uncertainty and a nonlinear auxiliary system considering actuator saturation; designing an observer to estimate the state of the auxiliary system and the output of the main system; designing the controllers for the main system and the auxiliary system respectively, and after the controllers of the main system and the auxiliary system are designed, obtaining the controller of the original system by integrating the controllers of the main system and the auxiliary system. According to the method, the influence of nonlinear information, uncertainty and interference of the system is fully considered, and a good trajectory tracking effect can be obtained; the influence of actuator saturation on system control performance is fully considered, and the classical linear control method can be still adopted in the main system through compensation of the auxiliary system. The method is simple, effective and high in flexibility and reliability.

Description

technical field [0001] The invention relates to an aircraft control method, in particular to an aircraft robust tracking control method considering actuator saturation, and belongs to the field of flight control. Background technique [0002] In the field of aerospace, due to the limitation of physical characteristics, the operating range of the aircraft actuator is limited. When the control signal given by the controller exceeds the maximum operating capacity of the actuator, the actuator will be saturated, such as in hypersonic aircraft. , the operating range of the elevator deflection angle is δ e ∈[-15°,15°], the working range of throttle valve opening is Φ∈[0.05,1.2]. Actuator saturation is a strong nonlinearity that affects system stability and dynamic performance. Therefore, the influence of actuator saturation must be considered in the controller design process to ensure the stability and performance of the system. [0003] A simple way to deal with actuator satur...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B13/04
CPCG05B13/042
Inventor 任锦瑞许斌梁小辉马波唐勇
Owner NORTHWESTERN POLYTECHNICAL UNIV
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