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首页> 外文期刊>Aerospace and Electronic Systems, IEEE Transactions on >A Robust Nonlinear Control Approach for Tip Position Tracking of Flexible Spacecraft
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A Robust Nonlinear Control Approach for Tip Position Tracking of Flexible Spacecraft

机译：挠性航天器尖端位置跟踪的鲁棒非线性控制方法

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摘要

In this paper, the problem of attitude control of a 3D nonlinear flexible spacecraft is investigated. Two nonlinear controllers are presented. The first controller is based on dynamic inversion, while the second approach is composed of dynamic inversion and $gamma$-synthesis schemes. The extension of dynamic inversion approach to flexible spacecraft is impeded by the nonminimum phase characteristics when the panel tip position is taken as the output of the system. To overcome this problem, the controllers are designed by utilizing the modified output redefinition approach. It is assumed that only three torques in three directions on the hub are used. Actuator saturation is also considered in the design of controllers. To evaluate the performance of the proposed controllers, an extensive number of simulations on a nonlinear model of the spacecraft are performed. The performances of the proposed controllers are compared in terms of nominal performance, robustness to uncertainties, vibration suppression of panel, sensitivity to measurement noise, environment disturbance, and nonlinearity in large maneuvers. Simulation results confirm the ability of the proposed controller in tracking the attitude trajectory while damping the panel vibration. It is also verified that the perturbations, environment disturbances, and measurement errors have only slight effects on the tracking and damping performances.
机译：本文研究了3D非线性柔性航天器的姿态控制问题。介绍了两个非线性控制器。第一个控制器基于动态反演，而第二种方法则由动态反演和$伽玛合成方案组成。当将面板尖端位置作为系统的输出时，非最小相位特性阻碍了动态反演方法向柔性航天器的扩展。为了克服这个问题，通过使用改进的输出重新定义方法来设计控制器。假设仅使用轮毂上三个方向的三个扭矩。在控制器的设计中也考虑了执行器饱和。为了评估所提出的控制器的性能，对航天器的非线性模型进行了大量的仿真。在名义性能，对不确定性的鲁棒性，面板的振动抑制，对测量噪声的灵敏度，环境干扰以及大机动中的非线性方面，对所提出的控制器的性能进行了比较。仿真结果证实了所提出的控制器在衰减面板振动的同时跟踪姿态轨迹的能力。还证实了摄动，环境干扰和测量误差对跟踪和阻尼性能的影响很小。

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