Nonlinear aircraft robust control method considering actuator saturation

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...

AI Technical Summary

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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