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A gofir-based adaptive feed-forward control method for aircraft gust mitigation

A feedforward control and feedforward controller technology, applied in the field of aircraft control, can solve the problems of high model order, the feedforward controller does not consider the dynamic characteristics of the controlled object, and the control efficiency is low.

Active Publication Date: 2017-06-06
CHINA ACAD OF AEROSPACE AERODYNAMICS
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Problems solved by technology

[0005] At present, the design of feed-forward controller is mainly based on FIR (finite impulse model), the model is as follows figure 1 As shown, the feedforward controller designed by this model does not consider the dynamic characteristics of the controlled object, the required model order is high, and the control efficiency is low

Method used

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  • A gofir-based adaptive feed-forward control method for aircraft gust mitigation
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  • A gofir-based adaptive feed-forward control method for aircraft gust mitigation

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Embodiment

[0150] Taking the gust mitigation of two-dimensional airfoil as an example, the steps and effects of using this method to control aircraft gust mitigation are described.

[0151] A two-dimensional airfoil model such as Figure 4 As shown in the figure, the half chord length of b in the figure, cb is the distance from the midpoint of the chord length to the rotation axis of the rudder surface, e.a. is the position of the elastic axis of the airfoil, c.g. is the position of the center of gravity of the airfoil, and a h is the ratio of the distance from the midpoint of the chord length to the elastic axis of the airfoil and b, x α The ratio of the distance from the elastic axis of the airfoil to the center of gravity of the airfoil and b, α is the pitch angle of the airfoil, h is the heaving distance of the airfoil, δ is the deflection angle of the rudder surface of the airfoil, K α and K ξ are the ups and downs stiffness of the airfoil and the torsional stiffness relative to t...

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Abstract

The invention relates to an aircraft gust alleviation self-adapting feedforward control method based on GOFIR. According to the present invention, the dynamic characteristics of a controlled object are injected into a GOFIR controller through the pole of an identified transfer function, the characteristic of the control system is obtained through an identification method and is represented by the pole of the transfer function, the GOFIR controller is designed by using the pole, and the coefficient of the GOFIR controller is obtained through a self-adapting algorithm; and with the method, the model order of the designed controller can be reduced, and the control efficiency of the controller can be improved.

Description

technical field [0001] The invention relates to a design method of an aircraft gust mitigation adaptive feedforward controller, in particular to a design method of an aircraft gust mitigation adaptive feedforward controller based on GOFIR (generalized orthogonal finite impulse response model), belonging to the technical field of aircraft control . Background technique [0002] In order to reduce the impact of the transport aircraft on the environment and improve the efficiency of the aircraft, the future solution is a light-weight aircraft with a large aspect ratio. For high-altitude and long-endurance UAVs, due to the high-altitude, low density and low wing load characteristics, it must adopt a large aspect ratio and low weight configuration. The rigid body motion frequency of these two types of aircraft is close to the structural elastic vibration frequency. When encountering a gust of wind, the vibration of its structure will be seriously excited, which will greatly redu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B64C13/16
Inventor 王永志李锋李志国李广佳
Owner CHINA ACAD OF AEROSPACE AERODYNAMICS
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