| 摘要: |
| 针对可重复使用运载器(RLV)再入飞行强非线性、快时变特性和多种控制模式给姿态控制器设计带来的困难和挑战，提出了一种双环滑模反作用控制系统（RCS）/气动舵复合控制器设计方案。首先建立了RLV再入飞行的数学模型，基于时标分离原理，设计了快、慢双环回路控制系统，并采用滑模控制律（SMCL）获得控制力矩指令；所设计的RCS/气动舵复合控制器，由控制分配将控制力矩指令分别映射成RCS推力器执行的开关指令和气动舵面偏转指令，采用链式递增融合协调气动舵与RCS的复合控制。仿真结果表明，双环滑模RCS/气动舵复合控制器能较好地完成姿态跟踪控制，有效地节省RCS燃料，实现了气动舵面与RCS的协调控制。控制方案也能用于再入飞行器或空天飞机的控制系统设计。 |
| 关键词: 再入 反作用控制系统 滑模控制律 控制分配 链式递增融合 |
| DOI： |
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| A RLV Dual-loop Sliding Mode RCS/Aerosurfaces Compound Controller Design |
| YU Guangxue,CHENG Xing,GENG Guangyou |
| (Beijing Institute of Astronautical Systems Engineering) |
| Abstract: |
| The reusable launch vehicle (RLV) features nonlinear, fast time-varying characteristics and multiple control modes, which challenge attitude control in task-adaptability greatly. A dual-loop sliding mode Reaction Control System(RCS)/Aerosurfaces compound controller scheme is presented. Firstly, the dynamic model was established for the RLV which is equipped with Reaction Control System (RCS) and aerosurfaces. Secondly, fast and slow loops control system was designed based on time-scale separate theory. Sliding Mode Control Law（SMCL） was implemented to generate control moment commands. Thirdly, the control moment commands were mapped into thrusters and aerodynamic effectors commands by control allocation module. Finally, daisy-chain combination method was applied to deal with the harmonization problem of the RCS and aerosufaces. Simulation result shows that the compound control scheme could meet the attitude tracking performance requirements. Moreover, it also shows that the dual-loop sliding mode RCS/Aerosurfaces compound controller could save RCS fuel effectively and achieves coordinated control between RCS and aerosurfaces. The control scheme can also be used in other reentry vehicles or aerospace planes. |
| Key words: Reentry Reaction Control System (RCS) Sliding Mode Control Law (SMCL) Control allocation Daisy-chain combination |