模型参考自适应系统的稳健性

 本文证明飞机俯仰角速度的模型参考自适应控制系统(MRACS)对未建模的长周期模态的稳健性。将飞机纵向运动的传递函数经因式分解后,得出一种特定的状态方程,通过变换,可把长周期模态的影响变成只考虑短周期模态的近似系统的等效慢变化干扰作用。由于MRACS具有自动调节控制增益以克服被控对象参数慢变及抑制慢变干扰的能力,从而整个闭环系统的稳健性得到了保证。

POBUSTNESS ANALYSIS OF A MODEL REFERENCE ADAPTIVE CONTROL SYSTEM

The purpose of this paper is to prove the robustness of a scheme of model reference adaptive control system (MRACS) of pitching velocity to the unmodeled long period mode. A special form of state equation is deduced from a factorijed transfer function of longitudinal motion of aircraft. By means of transformation, the effect of the long period mode can be shown as an equivalent slowly varying disturbance acting on the approximate modle of the system considering only the effect of short period mode. By virtue of the performance of MRACS of accommodating the slow parameter perturbation of the plant and are suppre seed the slowly varying disturbances the robustness of the MRACS is to be assured.