Decentralized fault-tolerant control for multiple electric sail relative motion at artificial Lagrange points
Decentralized fault-tolerant control for multiple electric sail relative motion at artificial Lagrange points
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DOI：
10.1016/j.ast.2020.105904
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发表时间：
2020-08
影响因子：
5.6
通讯作者：
Wei Wang-;G. Mengali;A. Quarta;H. Baoyin
中科院分区：
文献类型：
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作者：
Wei Wang-;G. Mengali;A. Quarta;H. Baoyin
本文建立了一种日地人工拉格朗日点处电子帆相对运动的分布式容错控制框架，能够考虑电子帆执行器的有效性损失和偏差误差等意外故障。在线性化动力学的基础上，建立了E帆相对运动问题的数学模型，通过适当调整帆的姿态和帆的轻度，实现了E帆的转向控制。所提出的控制策略有利于E-sail相对距离在一个有界的范围内发展，并同步收敛到期望值，同时确保碰撞避免的相对运动。特别是，本地共享的信息之间的电子帆被假定为其特征在于它们的相对距离，从而扩展了现有的结果，帆间通信能力是静态的。在集群飞行中分布多个E帆的概念对于像达尔文使命这样的深空编队任务是有用的，其中需要对空间环境进行多点测量。通过典型使命场景的仿真验证了该方法的有效性。
This paper establishes a distributed fault-tolerant control framework for E-sail relative motion at Sun-Earth artificial Lagrange points, capable of accounting for unexpected E-sail actuator fault like effectiveness loss and bias error. The E-sail relative motion problem is formulated on the linearized dynamics, and the steering control is conducted by suitably adjusting the sail attitude and sail lightness number. The proposed control strategy facilitates the E-sail relative distances to evolve within a bounded range and to synchronously converge to the desired values, while collision avoidance of the relative motion is ensured as well. In particular, the locally shared information among the E-sails is assumed to be characterized by their relative distances only, thus extending the existing results where the inter-sail communication capability is static. The concept of distributing multiple E-sails in cluster flight is useful for the deep-space formation missions such as the DARWIN mission, in which a multi-point measurement of the space environment is required. Illustrative examples show the validity of the proposed method in a typical mission scenario.