She did. Now I'm done!
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Much work has been performed recently to utilize the increasingly viable technology of
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low-thrust electric propulsion systems on missions of interplanetary scope. This thesis analyzes
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a technique for the initial analysis of feasibility of utilizing a combination of low-thrust
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propulsion systems and natural gravity flybys for missions to the outer planets. First, a method
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for finding local optima by utilizing an interior-point linesearch algorithm to directly
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optimize the entire trajectory as a Non-Linear Programming problem is presented. Then, a
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Monotonic Basin Hopping algorithm is utilized to traverse the search space, improve the local
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optima determined by the internal optimizer, and determine the global optima. This allows for a
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medium-fidelity, fully automated global optimization of the low thrust controls and flyby
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parameters for a given mission objective.
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a technique for designing trajectories for spacecraft with a low-thrust propulsion system that
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also use natural gravity flybys for missions to the outer planets. Often, the goal is to find
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feasible solutions that also minimize propellant mass requirements. First, locally optimal
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solutions are constructed by using an interior-point linesearch algorithm, along with multiple
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shooting techniques for optimization. Then, Monotonic Basin Hopping is utilized to traverse the
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search space, improve the local optima determined by the internal optimizer, and determine the
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global optima. This approach allows for a medium-fidelity, fully automated global optimization
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of the low thrust controls and flyby parameters for a given target destination. As an
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application of this method, two sample trajectories to Saturn are analyzed.
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}
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