基于时变增益的临近空间飞行器鲁棒控制  

Robust Control for Near Space Vehicle via Time-varying Gain

作　　者：黄福山[1] 宗群[1] 田栢苓[1] 曾凡琳[1] 

机构地区：[1]天津大学电气与自动化工程学院,天津300072

出　　处：《控制工程》2013年第1期124-127,共4页Control Engineering of China

基　　金：国家自然科学基金(91016018);国家自然科学基金(60874073);天当真市应用基础及前沿技术研究计划(11JCZDJC25100);教育部科学技术研究重大项目(311012)

摘　　要：临近空间飞行器具有多输入多输出、非线性、强耦合及参数不确定等特点,针对传统滑模控制方法应用于临近空间飞行器模型时存在的控制抖振问题,设计了一种可削弱控制抖振的非线性鲁棒控制方法。该控制方法利用滑模控制设计思路,针对速度及高度输出,结合动态逆方法分别设计解耦滑模面,同时利用Lyapunov稳定性概念设计时变的反馈增益,代替传统滑模控制方法中不连续的符号函数,有效的削弱了控制量抖振。仿真结果表明,该方法能够在削弱控制量抖振的同时,达到良好的跟踪性能和鲁棒性能,具有较好的应用价值。A nonlinear robust control law is designed for a near space vehicle because the traditional sliding mode control can bring the chattering of the control inputs while applying to this vehicle. The vehicle model is multi-input/multi-output, nonlinear, and includes strong coupling and uncertain parameters. The concept of sliding mode control and dynamic inversion are used to design the decoupling sliding mode surface for velocity output and height output. A time-varying feedback gain is derived according to the concept of Lyapunov stability instead of the discontinuous sign function in traditional sliding mode control. The chattering of the control inputs is mitigated effectively. Simulation studies are conducted to demonstrate that the proposed control law possesses good tracking performance and ro- bustness and can mitigate chattering.

关 键 词：临近空间飞行器 滑模控制 非线性鲁棒控制 时变反馈增益 

分 类 号：TP27[自动化与计算机技术—检测技术与自动化装置]