Active and passive combined fixed-wing aircraft gust alleviation control method

Abstract

The invention discloses an active and passive combined fixed-wing aircraft gust alleviation control method, and belongs to the technical field of aircraft control. Firstly, a two-dimensional coordinate system OZX is constructed, a wing comprises an inner side wing body and a full-moving wing tip, the wing is discretized in the OZX, and a vibration differential equation of the inner side wing bodyand the all-moving wing tip is listed; aerodynamic force acting on the inner side wing body is obtained through an aerodynamic force coefficient matrix, and discrete gust is calculated; the aerodynamic force and a model of the gust are substituted into the vibration differential equation, shear force merging is eliminated to obtain a kinetic equation in a complete machine large matrix form, and the kinetic equation is converted into an aircraft gust response dynamics equation; the acceleration and displacement of the wing mass center of a fixed-wing aircraft are selected as an objective function of the optimal control design, the deformation of the wing is worked out, and the efficiency of gust alleviation is verified. According to the method, under the same gust intensity and overload requirements, a required rudder deflection angle is reduced, the efficiency of the gust alleviation is improved, and a good weakening effect on the overload and deformation of the wing tip is achieved.

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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