A Control Method for Gust Mitigation of Fixed-wing Aircraft Combining Active and Passive

Abstract

The invention discloses an active and passive combined fixed-wing aircraft gust mitigation control method, which belongs to the technical field of aircraft control. First construct the two-dimensional coordinate system OZX, the wing is divided into the inner wing and the full-motion wingtip, discretize the wing in OZX, and list the vibration differential equations of the inner wing and the full-motion wingtip; through the aerodynamic coefficient matrix The aerodynamic force acting on the inner wing, and calculate the discrete gust; Substitute the model of aerodynamic force and gust into the vibration differential equation, eliminate the shear force and combine to obtain the dynamic equation of the whole machine in the form of a large matrix, and transform it into the aircraft gust response dynamics Equation; select the acceleration and displacement of the center of mass of the fixed-wing aircraft wing as the objective function of the optimal control design, calculate the deformation of the wing, and verify the efficiency of gust mitigation. The present invention reduces the required rudder deflection angle under the same gust strength and overload requirements, increases the efficiency of gust mitigation, and has a good weakening effect on the overload and deformation of the wing tip.

Description

technical field [0001] The invention belongs to the technical field of aircraft control, in particular to a control method for gust mitigation of fixed-wing aircraft combining active and passive. Background technique [0002] Fixed-wing aircraft are subjected to additional overload due to atmospheric disturbances and gusts during flight, among which vertical gusts are particularly serious. Gust overload will not only reduce the stability characteristics of the aircraft and destroy its flight quality, but also generate large dynamic structural loads and accelerate the fatigue damage of the structure. Therefore, gust mitigation control for fixed-wing aircraft is necessary. [0003] At present, the method of fixed-wing gust mitigation is mainly to use the control surface for active control: for general fixed-wing aircraft, the coordinated deflection of flaps or ailerons and elevators is usually used to reduce the overload caused by gusts. However, in order to meet the redunda...

AI Technical Summary

Problems solved by technology

However, in order to meet the redundancy requirements, this active control method generally requires a large weight, and at the same time, there may be problems such as insufficient control efficiency and time lag in feedback.

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