Singular perturbation decomposition-based ride quality control of elastic aircraft

基于奇异摄动分解的弹性飞机乘坐品质控制

¹ School of Automation, Northwestern Polytechnical University, Xi'an 710072, China
² AVIC Xi'an Flight Automatic Control Research Institute, Xi'an 710065, China

Received: 17 May 2023

Abstract

Considering the reduction of ride comfort under wind disturbance, the ride quality control method based on singular perturbation decomposition is proposed. For the dynamic model of elastic aircraft, the singular perturbation theory is used to decouple the model into the rigid-slow subsystem and the flexible-fast subsystem. Considering the additional time-varying disturbance and aerodynamic uncertainty of the rigid subsystem, the disturbance observer is designed to estimate disturbance effect and the neural network is used to deal with model uncertainty. The adaptive robust control is constructed using the composite estimation information as feedforward compensation and the tracking error of pitch rate and normal overload as feedback design. For the flexible subsystem, a nonsingular terminal sliding mode controller is designed to achieve active vibration suppression. The ride quality control law of elastic aircraft is obtained by combining the control inputs of the rigid and flexible subsystems, and the additional normal overload and elastic mode can be quickly restrained and converged. Based on Lyapunov stability analysis, the uniformly ultimate boundedness of the system is proved. The simulation results show that the proposed method can reduce the additional normal overload at the key positions of the aircraft under discrete gust and atmospheric turbulence, and the riding quality of elastic aircraft is effectively improved.

摘要

考虑弹性飞机在风干扰作用下乘客乘坐舒适性降低, 提出一种基于奇异摄动分解的乘坐品质控制方法。针对弹性客机动力学模型, 采用奇异摄动理论将模型解耦为刚性慢变子系统和弹性快变子系统。考虑刚性子系统的附加时变扰动和气动不确定影响, 设计干扰观测器估计扰动项并采用神经网络处理模型不确定性, 将复合估计信息作为前馈补偿并结合俯仰角速率和法向过载跟踪误差反馈给出自适应鲁棒控制策略。针对弹性子系统设计非奇异终端滑模控制, 实现振动主动抑制。综合刚弹子系统控制器设计形成弹性客机乘坐品质控制律, 实现附加法向过载和弹性模态的快速抑制收敛。基于李雅普诺夫稳定性分析证明了系统的一致终值有界。仿真结果表明, 在离散突风和大气紊流作用下所提出的控制方法能够降低客机关键位置处的附加法向过载, 有效提升弹性客机乘坐品质。