Volume 39, Number 1, February 2021
|Page(s)||167 - 174|
|Published online||09 April 2021|
An adaptive dynamic inversion control method based on improved piecewise constant for flight control system
School of Automation, Northwestern Polytechnical University, Xi'an 710129, China
2 Shaanxi Province Key Laboratory of Flight Control and Simulation Technology, Xi'an 710129, China
3 AVIC Xi'an Flight Automatic Control Research Institute, Xi'an 710076, China
To overcome the lack of robustness of the nonlinear dynamic inversion (NDI) control, a simple and practical adaptive NDI control method based on an improved piecewise constant is proposed in this paper to enhance its robustness to disturbances and improve the accuracy of response tracking. Firstly, reasonable assumptions and analyses are made for the system with the influence of disturbance. Secondly, an improved piecewise constant adaptive NDI control method suitable for general flight control systems is proposed. The stability of the control system with disturbance and the error convergence range of the improved piecewise constant adaptive control are proved and analyzed theoretically. Finally, taking into account the fighter actual control requirements, the angular rates control strategy is given, and the proposed method is applied to the angular rates flight controller design. Matlab simulations are carried out under the disturbance of the actuator failure and the sudden change of the center of gravity, and the robustness and dynamic performance of the controller designed based on the present method is compared and verified. The results illustrate that our present method has stronger robustness and higher control accuracy.
Key words: adaptive dynamic inversion control / improved piecewise constant / angular rate control / robustness / matlab simulation / flight control system / controller design
关键字 : 自适应动态逆控制 / 改进的分段常数自适应 / 角速度控制律 / 鲁棒性
© 2021 Journal of Northwestern Polytechnical University. All rights reserved.
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