弹性飞行器运动耦合特性分析

本文由弹性飞行器纵向运动扰动方程,研究了刚体姿态运动与弹性振动的典型耦合机理及特点,给出了运动耦合的稳定准则,以及对应于非耦合系统的响应误差估计.并以实例给予了验证.

Coupling Characteristics Analysis of Elastic Vehicle

As is well known, aeroelastic effect must be carefully considered in analysis and design of modern flight control system. Especially, when the vehicle is regarded as object of control, there exist complex interactions between the flight control system and elastic freedom, including both aeroelastic and aeroservoelastic couplings. Needness to say, the investigation about these coupling motions are very valuable to understanding the stability and dynamic behaviour of vehicle motion. In this paper, we establish the dynamic modeling of elastic vehicle with rigid-body attitude motion considered. The stability of elastic vehicle is investigated by Nyquist loci of system return-difference matrix with coupling motion between rigid-body and elastic vibration motion taken into consideration; and an error estimation, which is based on the singular value theory, is derived for the case of open / closed-loop control to indicate interactions between system variables, e.g. attitude varibale, elastic vibration variables. control and observation variable, etc. At the end, a practical example is given to demonstrate the proposed method.