弹性飞行器低阶鲁棒飞行控制律综合

摘要

针对传统飞行控制律设计中没有充分考虑弹性运动,要优化飞行器控制系统,需解决气动伺服弹性稳定性的问题,提出了一种弹性飞行器综合飞行控制律设计方法.利用分支模态法建立弹性飞行器的综合ASE系统模型,对弹性飞行器的飞行动力学、结构动力学以及由各种振动引起的非定常气动力,用降阶方法降低综合模型的阶次,以简化控制律设计的难度.采用混合灵敏度H∞鲁棒控制方法,设计满足性能要求的低阶综合控制律.仿真实验表明,综合控制律既能提供稳定的动态品质,又能有效抑制伺服颤振的发生,为工程实现提供了有效方法.%A design method of integrated flight control law for elastic flight vehicle is devised in this paper. First,the ASE model of a certain elastic aircraft has been built using the branch mode method, which considers the interactions of flight dynamics, structure dynamics and aerodynamics. Then a reduction method has been applied in the integrated ASE to simplify control law designing. At last, a low - order robust flight control law has been designed by using the mixed sensitivity H∞ control theory. The result of simulation shows that the control law can restrain the servo - flutter effectively with good dynamic characters, and it is propitious to engineering practicality for the low order.