面向宽域飞行的组合动力空天飞行器切换控制

Switching control of combined power aerospace vehicles for wide-area flight

针对组合动力空天飞行器宽域爬升过程存在的模态转换、气动参数未知以及外界时变干扰等问题,研究了一种基于飞行包线模态划分的切换控制方案.对飞行器六自由度模型和发动机推力模型进行气动和推力特性分析,给出了模态划分结果和模态转换过渡过程.基于切换信号设计建立了空天飞行器切换系统,设计终端滑模软切换控制策略来保证模态的平稳转换,并利用神经网络和非线性扰动观测器协同处理系统不确定性和外界时变干扰.通过多Lyapunov函数方法对闭环切换系统的稳定性进行了分析,且仿真结果验证了所提方法的有效性.

A switching control scheme based on the modal division of the flight envelope is studied in this work,which aims to address the problems of modal transition,unknown aerodynamic parameters,and external time-varying interference in the wide-area climbing of combined power aerospace vehicles.The results of modal division and the process of modal transition are obtained through the analysis of the aerodynamic and thrust characteristics of aircraft.The aerospace vehicle switching system is established on the basis of switching signal design.Then,the terminal sliding mode soft-switching control strategy is designed to ensure the smooth modal transition,wherein the neural network and nonlinear disturbance observer are used to address system uncertainty and external time-varying disturbance.The stability of the closed-loop switching system is analyzed by using the multi-Lyapunov function method,and the effectiveness of the proposed method is verified by simulation results.