柔性航天器的H_(∞)状态反馈控制器设计

H_(∞) State Feedback Controller Design for Flexible Spacecraft

当柔性航天器工作时,由于液体燃料的晃动与重力梯度等外界环境干扰,导致航天器系统出现强非线性以及强耦合性等特点,因此如何控制其姿态偏转一直是极具难点的问题。为了解决此问题,设计了一种H_(∞)状态反馈控制器,重新定义了柔性航天器的动力学模型中的综合扰动项,结合运动学模型描绘了柔性航天器的数学模型表达式。将柔性航天器的数学模型改写成了H_(∞)状态反馈控制数学模型。使用数学理论验证了控制器理论可用性,通过仿真软件对处于H_(∞)状态反馈控制律下的柔性航天器数学模型进行仿真。结果表明,设计的H_(∞)状态反馈控制器可以有效地实现柔性航天器的姿态稳定,振动抑制,具有实际价值。

When flexible spacecraft operates,disturbances such as the swaying of liquid fuel and gravity gradients cause the spacecraft system to exhibit strong nonlinearity and coupling characteristics.Thus,controlling its attitude deflection has always been a challenging problem.To solve this issue,this paper designs a H.state feedback controller.The integrated disturbance term in the dynamic model of the flexible spacecraft is redefined,and combined with the kinematic model,the mathematical expression of the flexible spacecraft is formulated.The mathematical model of the flexible spacecraft is transformed into an H state feedback control mathematical model.The theoretical applicability of the controller is demonstrated by mathematical theory.The mathematical model of the flexible spacecraft under H_(∞) state feedback control is simulated by simulation software.The results show that the designed H_(∞) state feedback controller can effectively achieve attitude stabilization and vibration suppression of flexible spacecraft,showing practical value.