Nonlinear adaptive flight control system:Performance enhancement and validation  

作　　者：Yue FENG Zonghua SUN Liaoni WU Yongshun WANG Bin XI Weng Khuen HO Yancheng YOU 

机构地区：[1]School of Aerospace Engineering,Xiamen University,Xiamen 361102,China [2]Department of Electrical and Computer Engineering,National University of Singapore,Singapore 117576,Singapore

出　　处：《Chinese Journal of Aeronautics》2023年第4期354-365,共12页中国航空学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.U21B6003);the China Scholarship Council(CSC,No.202006310096).

摘　　要：The problem of decreasing stability margins in L1 adaptive control systems is discussed and an out-of-loop L1 adaptive control scheme based on Lyapunov’s stability theorem is proposed.This scheme enhances the effectiveness of the adaptation,which ensures that the system has suffi-cient stability margins to achieve the desired performance under parametric uncertainty,additional delays,and actuator faults.The stability of the developed control system is demonstrated through a series of simulations.Compared with an existing control scheme,the constant adjustment of the sta-bility margins by the proposed adaptive scheme allows their range to be extended by a factor of 4–5,bringing the stability margin close to that of variable gain PD control with adaptively scheduled gains.The engineered practicability of adaptive technology is verified.A series of flight tests verify the practicability of the designed adaptive technology.The results of these tests demonstrate the enhanced performance of the proposed control scheme with nonlinear parameter estimations under insufficient stability margins and validate its robustness in the event of actuator failures.

关 键 词：Adaptive control systems Control engineering Flight control systems Nonlinear control systems Robustness stability 

分 类 号：V249.1[航空宇航科学与技术—飞行器设计]