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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。
Near-space vehicles are characterized by multi-input and multi-output, nonlinearity, strong coupling and uncertain parameters. Aiming at the problem of control chattering when the traditional sliding mode control method is applied to the near space vehicle model, The nonlinear robust control method. The control method uses sliding mode control design method to design the decoupled sliding surface for velocity and altitude output and dynamic inverse method respectively. In the meantime, the time-varying feedback gain is designed by Lyapunov stability concept instead of discontinuous in the traditional sliding mode control method The symbolic function effectively weakens the control volume chattering. The simulation results show that this method can achieve good tracking performance and robust performance while weakening the control chattering, and has good application value.