She did. Now I'm done!
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\chapter{Sample Saturn Trajectory Analysis} \label{results}
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\chapter{Application: Designing a Trajectory To Saturn} \label{results}
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The algorithm described in this thesis is quite flexible in its design and could be used as
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a tool for a mission designer on a variety of different mission types. However, to consider
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a relatively simple but representative mission design objective, a sample mission to Saturn
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was investigated.
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To consider a relatively simple but representative mission design objective, a sample mission to
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Saturn was investigated.
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\section{Mission Constraints}
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\section{Mission Scenario}
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The sample mission was defined to represent a general case for a near-future low-thrust
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trajectory to Saturn. No constraints were placed on the flyby planets, but a number of
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The sample mission is defined to represent a general case for a near-future low-thrust
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trajectory to Saturn. No constraints are placed on the flyby planets, but a number of
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constraints were placed on the algorithm to represent a realistic mission scenario.
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The first choice required by the application is one not necessarily designable to the
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initial mission designer (though not necessarily fixed in the design either) and is that
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of the spacecraft parameters. The application accepts as input a spacecraft object
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containing: the dry mass of the craft, the fuel mass at launch, the number of onboard
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thrusters, and the specific impulse, maximum thrust and duty cycle of each thruster.
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initial mission designer (though not necessarily fixed in the design either) and is that of
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the spacecraft parameters. The application accepts as input a spacecraft object containing:
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the dry mass of the spacecraft, the fuel mass at launch, the number of onboard thrusters,
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and the specific impulse, maximum thrust and duty cycle of each thruster.
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For this mission, the spacecraft was chosen to have a dry mass of only 200 kilograms for
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a fuel mass of 3300 kilograms. This was chosen in order to have an overall mass roughly
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in the same zone as that of the Cassini spacecraft, which launched with 5712 kilograms
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of total mass, with the fuel accounting for 2978 of those kilograms\cite{cassini}. The
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dry mass of the craft was chosen to be extremely low in order to allow for a variety of
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''successful`` missions in which the craft didn't run out of fuel. That way, the
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delivered dry mass to Saturn could be thought of as a metric of success, without
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discounting mission that may have delivered just under whatever more realistic dry mass
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one might set, in case those missions are in the vicinity of actually valid missions.
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For this mission, the spacecraft was chosen to have a dry mass of only 200 kilograms for a
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fuel mass of 3300 kilograms. This was chosen in order to have an overall mass roughly in the
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same zone as that of the Cassini spacecraft, which launched with 5712 kilograms of total
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mass, with the fuel accounting for 2978 of those kilograms\cite{cassini}. The dry mass of
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the spacecraft was chosen to be extremely low in order to allow for a variety of
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''successful`` missions in which the spacecraft didn't run out of fuel. That way, the
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delivered dry mass to Saturn could be thought of as a metric of success, without discounting
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mission that may have delivered just under whatever more realistic dry mass one might set,
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in case those missions are in the vicinity of actually valid missions.
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The thruster was chosen to have a specific impulse of 3200 seconds, a maximum thrust of
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250 millinewtons, and a 100\% duty cycle. This puts the thruster roughly in line with
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@@ -308,6 +306,6 @@
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\centering
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\includegraphics[width=\textwidth]{fig/c3}
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\caption{Plot of Delta IV and Atlas V launch vehicle capabilities as they relate to
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payload mass \cite{c3capabilities} from a source from 2007}
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payload mass \cite{c3capabilities} from Vardaxis, et al, 2007 }
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\label{c3}
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\end{figure}
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