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fixed appendix

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aj 2021-01-10 18:38:17 +00:00
parent 7511a96f56
commit 07f0ab8caa
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final report/report.lyx
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@ -6148,7 +6148,7 @@ noprefix "false"
about 20 minutes. about 20 minutes.
This was modelled by having the input power move in discrete steps as cells This was modelled by having the input power move in discrete steps as cells
are turned on and off. are turned on and off.
This step value was defined as 200kW, the most efficient state for a single This step value was defined as 200 kW, the most efficient state for a single
fuel cell. fuel cell.
\end_layout \end_layout
@ -6168,28 +6168,24 @@ Power Out
\begin_layout Standard \begin_layout Standard
In order to model the load draw from the propulsion and hotel load, a random In order to model the load draw from the propulsion and hotel load, a random
differential was applied each second. power load delta was added or subtracted each second.
This was done in order to provide a dynamic environment, were the load This was done in order to provide a dynamic environment, were the load
power to stay the same the battery would either charge or discharge entirely power to stay the same the battery would either charge or discharge entirely
and then stay in this state. and then stay in this state.
A random change each second more closely matches the expected power requirement A random change each second more closely matches the expected power requirement
s as the wind and currents are also dynamic. s as the wind and currents required a dynamic load to be drawn.
\end_layout \end_layout
\begin_layout Standard \begin_layout Standard
The max load differential was defined as 10 kW. The max load delta was defined as 10 kW.
This means that each second the load could change by a maximum of This means that each second the load could change by a maximum of ±10 kW
\begin_inset Formula $\pm$ with a random number between -1 and 1 used as a scale factor.
\end_inset
10kW as a random number between -1 and 1 was generated and used as a coefficient.
\end_layout \end_layout
\begin_layout Standard \begin_layout Standard
The different stages of a mission were defined as having a maximum and minimum The different stages of a mission were defined as having a maximum and minimum
load power which the random function was able to fluctuate between. load power which the random function was able to fluctuate between.
When dynamic positioning it could be expected that more power would be When dynamic positioning, it could be expected that more power would be
used than when completing either the out or home-bound journey. used than when completing either the out or home-bound journey.
\end_layout \end_layout
@ -6215,6 +6211,10 @@ In terms of applicability, the model provides a good high-level approximation
For example, the model only increments or decrements the active fuel cells For example, the model only increments or decrements the active fuel cells
by one at each twenty minute interval when in reality many could be activated by one at each twenty minute interval when in reality many could be activated
or deactivated simultaneously. or deactivated simultaneously.
The model was also entirely reactive, acting only on the current capacity
of the battery.
In practice, knowledge of other factors including the upcoming mission
stages and weather forecast would allow the system to be more pro-active.
\end_layout \end_layout
\end_body \end_body