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arXiv 2308.03391math.SGmath.DS
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辛几何与空间任务设计

Symplectic geometry and space mission design

Cengiz Aydin, Urs Frauenfelder, Otto van Koert, Dayung Koh, Agustin Moreno

AI总结:

本文结合辛几何与数值方法研究木星—木卫二、土星—土卫二系统的周期轨道族及平面到空间分岔,并提出 Conley–Zehnder 指标计算算法,用于设计接近土卫二水羽流的任务轨道。

摘要:

利用辛几何方法,第二作者和第五作者已提供了理论基础与工具,旨在分析周期轨道、其稳定性及其在族中的分岔,以服务于空间任务设计。Broucke 稳定性图得到了改进,并且“Floer 数值不变量”被视为在分岔前后保持不变的数值,因此可用作所用算法的检验。这些工具随后被用于数值研究。在本文中,我们将通过对 Jupiter–Europa(木星—木卫二)和 Saturn–Enceladus(土星—土卫二)系统中轨道族的数值研究,进一步阐明这些方法,重点关注平面到空间的分岔,这些分岔源于第一作者所研究的 Hill 月球问题中轨道族的形变。我们还将给出一种数值计算 Conley–Zehnder 指标的算法;在实践中,这些指标对于确定哪些轨道族与哪些轨道族相连接非常重要。作为应用,我们使用这些工具研究一个周期轨道族,该轨道族以 29 km 的高度接近 Enceladus(土卫二),因此可用于未来访问水羽流的空间任务。

英文摘要:

Using methods from symplectic geometry, the second and fifth authors have provided theoretical groundwork and tools aimed at analyzing periodic orbits, their stability and their bifurcations in families, for the purpose of space mission design. The Broucke stability diagram was refined, and the "Floer numerical invariants" where considered, as numbers which stay invariant before and after a bifurcation, and therefore serve as tests for the algorithms used. These tools were later employed for numerical studies. In this article, we will further illustrate these methods with numerical studies of families of orbits for the Jupiter-Europa and Saturn-Enceladus systems, with emphasis on planar-to-spatial bifurcations, from deformation of the families in Hill's lunar problem studied by the first author. We will also provide an algorithm for the numerical computation of Conley--Zehnder indices, which are instrumental in practice for determining which families of orbits connect to which. As an application, we use our tools to study a family of periodic orbits that approaches Enceladus at an altitude of 29km, and therefore may be used in future space missions to visit the water plumes.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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