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University of Texas – Austin

1. -9883-5836. Patched periodic orbits : a systematic strategy for low-energy trajectory and moon tour design.

Degree: Aerospace Engineering, 2018, University of Texas – Austin

The implementation of low-energy trajectories has opened a new paradigm in trajectory design, where, at the cost of long transfer times, low-fuel consumption missions opened a new world of routes for space exploration. Low-cost lunar missions and the exploration of the gas giant planetary satellite systems are one of the main applications of these fuel-efficient trajectories. However, the flexibility in applications that low-energy trajectories provide comes at the cost of high complexity in the design. In this dissertation a systematic strategy to simplify the design process of low-energy trajectories is developed. The method, called patched periodic orbits (PPO) is analogous to the patched-conics model in high energy regimes, where conic segments are used as building blocks to give rise to full complex trajectories. In the PPO model, the building blocks are precomputed three-body periodic orbits that are patched together to build transfer mechanisms in multi-body environments. To support the PPO model, a broad database of axisymmetric three-body periodic orbits for planets and main planetary satellites in the Solar System have been generated and provided online. The periodic orbit search is performed over 24 pairs of bodies that are well approximated by the circular restricted three-body problem, resulting in approximately 3 million periodic solutions. The database contains a new set of periodic solutions that approximate heteroclinic connections between other pairs of periodic orbits. These connecting orbits provide free escape/capture mechanisms as well as natural transfers between libration point orbits, among others. In order to efficiently converge the highly sensitive solutions the database is generated using a multiple grid search strategy and a robust differential corrector with a full second-order trust region method. Examples of point design applications for several different challenging trajectory problems are introduced, including transfers between the Galilean moons, alternative endgames of a Europa mission, and low-cost Earth-Moon transfers with ballistic lunar captures. Additionally, a strategy to compute landing trajectories at Europa with a broad surface coverage is presented. The strategy uses lissajous segments as staging orbits that allow to decouple the landing phase with the Europa approach. Combining the PPO model and the landing strategy, an end-to-end solution that connects the landing phase, the staging orbit, and a Ganymede-Europa moon tour is presented. Advisors/Committee Members: Russell, Ryan P., 1976- (advisor), Fowler, Wallece T. (committee member), Akella, Maruthi R. (committee member), Bettadpur, Srinivas V. (committee member), Lo, Martin (committee member).

Subjects/Keywords: Low-energy trajectory; Astrodynamics; Celestial mechanics; Circular restricted three-body problem; Periodic orbits; Mission design; Trajectory optimization; Galilean moon tours

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APA (6th Edition):

-9883-5836. (2018). Patched periodic orbits : a systematic strategy for low-energy trajectory and moon tour design. (Thesis). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/68679

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

-9883-5836. “Patched periodic orbits : a systematic strategy for low-energy trajectory and moon tour design.” 2018. Thesis, University of Texas – Austin. Accessed December 14, 2018. http://hdl.handle.net/2152/68679.

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

-9883-5836. “Patched periodic orbits : a systematic strategy for low-energy trajectory and moon tour design.” 2018. Web. 14 Dec 2018.

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

Vancouver:

-9883-5836. Patched periodic orbits : a systematic strategy for low-energy trajectory and moon tour design. [Internet] [Thesis]. University of Texas – Austin; 2018. [cited 2018 Dec 14]. Available from: http://hdl.handle.net/2152/68679.

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

-9883-5836. Patched periodic orbits : a systematic strategy for low-energy trajectory and moon tour design. [Thesis]. University of Texas – Austin; 2018. Available from: http://hdl.handle.net/2152/68679

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Not specified: Masters Thesis or Doctoral Dissertation

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