\documentclass[defaultstyle,11pt]{thesis} \usepackage{graphicx} \usepackage{amssymb} \usepackage{hyperref} \usepackage{amsmath} \usepackage{amsfonts} \usepackage{float} \usepackage{xfrac} \title{Designing Optimal Low-Thrust Interplanetary Trajectories Utilizing Monotonic Basin Hopping} \author{Richard C.}{Johnstone} \otherdegrees{B.S., Unviersity of Kentucky, Mechanical Engineering, 2016 \\ B.S., University of Kentucky, Physics, 2016} \degree{Master of Science}{M.S., Aerospace Engineering} \dept{Department of}{Aerospace Engineering} \advisor{Prof.}{Natasha Bosanac} \reader{Kathryn Davis} \readerThree{Daniel Scheeres} \abstract{ \OnePageChapter There are a variety of approaches to finding and optimizing low-thrust trajectories in interplanetary space. This thesis analyzes one such approach, namely the application of a Monotonic Basin Hopping (MBH) algorithm to a series of Sims-Flanagan transcribed trajectory arcs and its applications in a multiple-shooting non-linear solver for the purpose of finding valid low-thrust trajectories between planets given poor initial conditions. These valid arcs are then fed into the MBH algorithm, which combines them in order to find and optimize interplanetary trajectories, given a set of flyby planets. This allows for a fairly rapid searching of a very large solution space of low-thrust profiles via a medium fidelity inner-loop solver and a well-suited optimization routine. The trajectories found by this method can then be optimized further by feeding the solutions back, once again, into the non-linear solver, this time allowing the solver to perform optimization. } \dedication[Dedication]{ Dedicated to some people. } \acknowledgements{ \OnePageChapter This will be an acknowledgement. } \emptyLoT \begin{document} \input macros.tex \input LaTeX/introduction.tex \input LaTeX/trajectory_design.tex \input LaTeX/trajectory_optimization.tex \input LaTeX/approach.tex \input LaTeX/results.tex \bibliographystyle{plain} \nocite{*} \bibliography{thesis} \appendix \end{document}