She did. Now I'm done!

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Connor
2022-03-15 22:20:45 -06:00
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\chapter{Sample Saturn Trajectory Analysis} \label{results}
\chapter{Application: Designing a Trajectory To Saturn} \label{results}
The algorithm described in this thesis is quite flexible in its design and could be used as
a tool for a mission designer on a variety of different mission types. However, to consider
a relatively simple but representative mission design objective, a sample mission to Saturn
was investigated.
To consider a relatively simple but representative mission design objective, a sample mission to
Saturn was investigated.
\section{Mission Constraints}
\section{Mission Scenario}
The sample mission was defined to represent a general case for a near-future low-thrust
trajectory to Saturn. No constraints were placed on the flyby planets, but a number of
The sample mission is defined to represent a general case for a near-future low-thrust
trajectory to Saturn. No constraints are placed on the flyby planets, but a number of
constraints were placed on the algorithm to represent a realistic mission scenario.
The first choice required by the application is one not necessarily designable to the
initial mission designer (though not necessarily fixed in the design either) and is that
of the spacecraft parameters. The application accepts as input a spacecraft object
containing: the dry mass of the craft, the fuel mass at launch, the number of onboard
thrusters, and the specific impulse, maximum thrust and duty cycle of each thruster.
initial mission designer (though not necessarily fixed in the design either) and is that of
the spacecraft parameters. The application accepts as input a spacecraft object containing:
the dry mass of the spacecraft, the fuel mass at launch, the number of onboard thrusters,
and the specific impulse, maximum thrust and duty cycle of each thruster.
For this mission, the spacecraft was chosen to have a dry mass of only 200 kilograms for
a fuel mass of 3300 kilograms. This was chosen in order to have an overall mass roughly
in the same zone as that of the Cassini spacecraft, which launched with 5712 kilograms
of total mass, with the fuel accounting for 2978 of those kilograms\cite{cassini}. The
dry mass of the craft was chosen to be extremely low in order to allow for a variety of
''successful`` missions in which the craft didn't run out of fuel. That way, the
delivered dry mass to Saturn could be thought of as a metric of success, without
discounting mission that may have delivered just under whatever more realistic dry mass
one might set, in case those missions are in the vicinity of actually valid missions.
For this mission, the spacecraft was chosen to have a dry mass of only 200 kilograms for a
fuel mass of 3300 kilograms. This was chosen in order to have an overall mass roughly in the
same zone as that of the Cassini spacecraft, which launched with 5712 kilograms of total
mass, with the fuel accounting for 2978 of those kilograms\cite{cassini}. The dry mass of
the spacecraft was chosen to be extremely low in order to allow for a variety of
''successful`` missions in which the spacecraft didn't run out of fuel. That way, the
delivered dry mass to Saturn could be thought of as a metric of success, without discounting
mission that may have delivered just under whatever more realistic dry mass one might set,
in case those missions are in the vicinity of actually valid missions.
The thruster was chosen to have a specific impulse of 3200 seconds, a maximum thrust of
250 millinewtons, and a 100\% duty cycle. This puts the thruster roughly in line with
@@ -308,6 +306,6 @@
\centering
\includegraphics[width=\textwidth]{fig/c3}
\caption{Plot of Delta IV and Atlas V launch vehicle capabilities as they relate to
payload mass \cite{c3capabilities} from a source from 2007}
payload mass \cite{c3capabilities} from Vardaxis, et al, 2007 }
\label{c3}
\end{figure}