空天飞行器再入姿态模糊切换多模型控制

针对多模型切换控制在切换边界处的不平滑性,提出了一种模糊切换多模型控制。将其输入空间划分为若干个模糊区域以使区域边界模糊化,在各区域内设计局部T-S模型和控制器。根据所选定的变量将相应的区域控制器切换为全局控制器,由于控制器切换是在模糊了的区域边界处进行的,故保证了切换过程中系统状态轨迹的平滑性。利用该控制方案为空天飞行器设计了再入姿态飞行控制系统,高超声速飞行条件下的仿真实验证明了方法的有效性。

Fuzzy switching multi-model control for the aerospace vehicle''''s re-entry attitude

To solve the problem of unsmooth switching of multi-model control at switching boundaries,a fuzzy switching multi-model control method is proposed.Firstly,the input space is divided into multiple fuzzy regions to blur boundaries,and local T-S models and controllers are designed in each region.Secondly,a region controller,which is chosen according to selected variables,is switched to the whole controller.For the switching is made on fuzzy boundaries,the smoothness of the system state travactory is ensured.Finally,the proposed method is used to design the flight control system for the aerospace vehicle's re-entry attitude.In the high supersonic velocity flight condition,simulation results show the effectiveness of the method.