【摘要】 提出了一种改进的特征结构配置方法。采用输出反馈配置系统的闭环特征值和特征向量,引入前馈补偿器以满足系统期望的自然频率,以保证良好的稳定裕度,并提供良好的跟踪性能。再引入积分器来减少系统的跟踪误差并对建模误差和扰动都能提供附加的鲁棒性。用所提出的改进方法对某推力矢量飞机的纵向运动进行了数字仿真,仿真结果表明,所提出的改进特征结构配置方法不仅具有良好的快速跟踪特性,而且还具有良好的鲁棒性。更多还原

【Abstract】 Purpose.Existing eigenstructure assignment method,in our opinion,can be improved to make both its tracking capability and its robustness better.In the full paper,we explain in detail how to make the improvement we envisaged;in this abstract,we just give the two topics of our explanation:(A) brief introduction to eigenstructure assignment method;equations like eqs.(1) through(14) in the full paper can be readily found in the open literature;(B) design of feedforward compensator and integrator;Fig.1 in the full paper gives the schematic of feedforward compensator and integrator;eqs.(15),(16),and(17) derived by us are what we need in the design.Feedforward compensator is designed to obtain the desired natural frequencies of the system to ensure good stability margins and to provide good tracking response to pilot commands.Integrator is designed to reduce tracking errors and to provide additional robustness to modeling errors and disturbances.An aircraft with thrust vector is studied by using the presented method.Simulation results,shown in Figs.2 and 3 in the full paper,show preliminarily that the flight control system based on our improved eigenstructure assignment method not only provides good tracking capability but also has good robustness.更多还原