Reinforced Lyapunov controllers for low-thrust lunar transfers

IF 2.7 1区 物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS Astrodynamics Pub Date : 2024-09-05 DOI:10.1007/s42064-024-0212-x
Harry Holt, Nicola Baresi, Roberto Armellin
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Abstract

Future missions to the Moon and beyond are likely to involve low-thrust propulsion technologies due to their propellant efficiency. However, these still present a difficult trajectory design problem, owing to the near continuous thrust, lack of control authority and chaotic dynamics. Lyapunov control laws can generate sub-optimal trajectories for such missions with minimal computational cost and are suitable for feasibility studies and as initial guesses for optimisation methods. In this work a Reinforced Lyapunov Controller is used to design optimal low-thrust transfers from geostationary transfer orbit towards lunar polar orbit. Within the reinforcement learning (RL) framework, a dual-actor network setup is used, one in each of the Earth- and Moon-centred inertial frames respectively. A key contribution of this paper is the demonstration of a forwards propagated trajectory, removing the need to define a patch point a priori. This is enabled by an adaptive patch distance and extensive initial geometry exploration during the RL training. Results for both time- and fuel-optimal transfers are presented, along with a Monte Carlo analysis of the robustness to disturbances for such transfers. Phasing is introduced where necessary to aid rendezvous with the Moon. The results demonstrate the potential for such techniques to provide a basis for the design and guidance of low-thrust lunar transfers.

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用于低推力月球转移的强化李亚普诺夫控制器
由于低推力推进技术的推进剂效率高,未来的月球及月球以外飞行任务很可能采用这种技术。然而,由于近乎持续的推力、缺乏控制权和混乱的动力学,这些仍然是一个困难的轨迹设计问题。李亚普诺夫控制法则能以最小的计算成本为这类任务生成次优轨迹,适用于可行性研究和优化方法的初始猜测。在这项工作中,强化李亚普诺夫控制器用于设计从地球静止转移轨道到月球极地轨道的最佳低推力转移。在强化学习(RL)框架内,使用了双角色网络设置,分别在以地球和月球为中心的惯性框架内各设置一个角色。本文的一个主要贡献是展示了前向传播轨迹,无需事先定义补丁点。这得益于 RL 训练期间的自适应补间距和广泛的初始几何探索。文中介绍了时间和燃料最优转移的结果,并对这种转移对干扰的鲁棒性进行了蒙特卡罗分析。必要时还引入了相位调节,以帮助与月球会合。结果表明,这种技术有可能为低推力月球转移的设计和指导提供基础。
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来源期刊
Astrodynamics
Astrodynamics Engineering-Aerospace Engineering
CiteScore
6.90
自引率
34.40%
发文量
32
期刊介绍: Astrodynamics is a peer-reviewed international journal that is co-published by Tsinghua University Press and Springer. The high-quality peer-reviewed articles of original research, comprehensive review, mission accomplishments, and technical comments in all fields of astrodynamics will be given priorities for publication. In addition, related research in astronomy and astrophysics that takes advantages of the analytical and computational methods of astrodynamics is also welcome. Astrodynamics would like to invite all of the astrodynamics specialists to submit their research articles to this new journal. Currently, the scope of the journal includes, but is not limited to:Fundamental orbital dynamicsSpacecraft trajectory optimization and space mission designOrbit determination and prediction, autonomous orbital navigationSpacecraft attitude determination, control, and dynamicsGuidance and control of spacecraft and space robotsSpacecraft constellation design and formation flyingModelling, analysis, and optimization of innovative space systemsNovel concepts for space engineering and interdisciplinary applicationsThe effort of the Editorial Board will be ensuring the journal to publish novel researches that advance the field, and will provide authors with a productive, fair, and timely review experience. It is our sincere hope that all researchers in the field of astrodynamics will eagerly access this journal, Astrodynamics, as either authors or readers, making it an illustrious journal that will shape our future space explorations and discoveries.
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