再入飞行器变结构姿态控制律设计与仿真  

Variable Structure Attitude Control Algorithm of Reentry Vehicle

作　　者：及鹏飞[1] 周军[1] 

机构地区：[1]西北工业大学精确制导与控制研究所,陕西西安710072

出　　处：《计算机仿真》2010年第4期53-56,共4页Computer Simulation

摘　　要：研究飞行器再入问题,以美国X-34技术验证机为对象,提出了一种再入飞行器变结构姿态控制算法。为提高姿态控制的精度,通过设计内外双环控制器,并选择适当的趋近律和符号函数连续化方法来解决由于变结构控制带来的抖振问题。同时基于X-34反作用控制系统(RCS)配置方案给出了一种RCS控制模式。由于RLV存在两套姿态控制执行机构与气动舵面,提出了一种基于动压调节的混合控制策略。最后通过Matlab/Simulink仿真计算验证了在标称状态与加入扰动时的控制算法的有效性,具有良好的跟踪性能和强鲁棒性。The sliding mode variable structure attitude control algorithm of reentry vehicle is presented in this pa- per. The design methodology combines the outer - loop and inner - loop variable structure control controller. The chattering that is brought by the variable structure control technique is eliminated by choosing a suitable reaching law and a continuous analogy of sign function. A simple control mode of reaction control system is presented based on the RCS scheme of American X - 34 technology demonstrator. During the reentry flight phase, two different attitude ef- lectors for attitude control, aerosurfaces and the RCS, are employed.. A composite control strategy based on the dy- namic pressure variety is presented. Analysis and nonlinear simulation results show that the sliding mode variable structure controller achieves performance objective and high robustness.

关 键 词：再入飞行器 姿态控制 变结构控制 反作用控制系统 

分 类 号：V412.41[航空宇航科学与技术—航空宇航推进理论与工程]