Robust dynamic inversion control of flight control system based on L1 adaptive structure

基于L1自适应结构的动态逆飞行控制方法研究

¹ 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 Chengdu Aircraft Design and Research Institute, Chengdu 610091, China

Received: 8 January 2021

Abstract

Nonlinear Dynamic Inversion(NDI) control has excellent rapidity and decoupling ability, unfortunately it lacks the essential robustness to disturbance. From the perspective of enhancing the robustness, an adaptive NDI method based on L1 adaptive structure is proposed. The L1 adaptive structure is introduced into the NDI control to enhance its robustness, which also guarantees the stability and expected dynamic performance of the system suffering from the disturbance influence. Secondly, the flight control law of the advanced aircraft is designed based on the present method to improve the robustness and fault tolerance of the flight control system. Finally, the effectiveness of the flight control law based on the present approach is verified under the fault disturbance. The results showed that the flight control law based on L1 adaptive NDI has excellent dynamic performance and strong robustness to parameter uncertainties and disturbances.

摘要

非线性动态逆控制具有很好的快速性和解耦能力，但自身缺乏必要的鲁棒性。因此，从提高动态逆控制方法鲁棒性的角度出发，提出一种动态性能优异、强鲁棒的L1自适应结构的自适应动态逆控制方法。该方法通过引入L1自适应结构来增强动态逆控制的鲁棒性，并且保证系统在扰动干扰下的稳定性和动态性能。基于此方法设计了飞行控制律，旨在提高飞控系统的鲁棒性和容错能力。在故障干扰下验证了所设计控制器的有效性，仿真结果表明基于L1自适应动态逆设计的飞行控制器在参数不确定性等扰动具有强大的鲁棒性，能够保证系统在扰动下依旧达到期望的动态性能。