A Solution to the Inherent List on Nimitz Class Aircraft Carriers
A Solution to the Inherent List on Nimitz Class Aircraft Carriers
A Solution to the Inherent List on Nimitz Class Aircraft Carriers
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Table 5: Required Structural Modificati<strong>on</strong>s for 8-225-6-V<br />
Ship Structure<br />
Structural Modiflcati<strong>on</strong>s<br />
Shell Plating<br />
Inner L<strong>on</strong>gitudinal<br />
Bulkhead (Shaft Alley<br />
Bulkhead #4)<br />
Outer L<strong>on</strong>gitudinal<br />
Bulkhead (Bulkhead<br />
#3)<br />
Transverse Bulkhead<br />
(Frame 225)<br />
Transverse Bulkhead<br />
(Frame 230)<br />
No modificati<strong>on</strong>s required<br />
Add 5 vertical stiffeners<br />
(5" X 4" X 7.5# X T) (MS)<br />
Max Panel Plating Size: 24" X 114"<br />
Add 5 vertical stiffeners<br />
(5" X 4" X 7.5# X T) (MS)<br />
Max Panel Plating Size: 24" X 87"<br />
Add 4 vertical stiffeners<br />
(5" X 4" X 7.5# X T) (MS)<br />
Max Panel Plating Size: 15" X 114"<br />
*Note-panel height is dependent <strong>on</strong><br />
trapezoidal geometry<br />
Add 4 vertical stiffeners<br />
(5" X 4" X 7.5# X T) (MS)<br />
Max Panel Plating Size: 15" X 114"<br />
*Note-panel height is dependent <strong>on</strong><br />
trapezoidal geometry<br />
3.0 Final Analysis and Results<br />
This project design spiraled <str<strong>on</strong>g>to</str<strong>on</strong>g>ward finding <str<strong>on</strong>g>the</str<strong>on</strong>g> most cost effective and advantageous<br />
solid ballasting soluti<strong>on</strong> for correcting <str<strong>on</strong>g>the</str<strong>on</strong>g> inherent list <strong>on</strong> <str<strong>on</strong>g>the</str<strong>on</strong>g> <strong>Nimitz</strong> class carriers. The<br />
preliminary decisi<strong>on</strong>-making cost estimati<strong>on</strong> proved that <str<strong>on</strong>g>the</str<strong>on</strong>g> 200 Ib/ft^ density was <str<strong>on</strong>g>the</str<strong>on</strong>g> most cost<br />
effective for <str<strong>on</strong>g>the</str<strong>on</strong>g> same amount of ballast weight. The 325 Ib/ft^ ballast was so much more<br />
expensive, that although <str<strong>on</strong>g>the</str<strong>on</strong>g> number of tanks required <str<strong>on</strong>g>to</str<strong>on</strong>g> ballast with 200 Ib/ft^ was higher, it was<br />
still more cost effective <str<strong>on</strong>g>to</str<strong>on</strong>g> use <str<strong>on</strong>g>the</str<strong>on</strong>g> 200 Ib/ft^ density ballast. Once <str<strong>on</strong>g>the</str<strong>on</strong>g> structural analysis was<br />
complete, <str<strong>on</strong>g>the</str<strong>on</strong>g> minimum ballasting weights that were found had <str<strong>on</strong>g>to</str<strong>on</strong>g> be analyzed in POSSE again.<br />
For this analysis, <str<strong>on</strong>g>the</str<strong>on</strong>g> 4'*' deck was eliminated completely due <str<strong>on</strong>g>to</str<strong>on</strong>g> its structural limitati<strong>on</strong>s.<br />
Similarly, any required structural modificati<strong>on</strong>s that were not already included in <str<strong>on</strong>g>the</str<strong>on</strong>g> cost<br />
estimati<strong>on</strong>s had <str<strong>on</strong>g>to</str<strong>on</strong>g> be taken in <str<strong>on</strong>g>to</str<strong>on</strong>g> account for both <str<strong>on</strong>g>the</str<strong>on</strong>g> 2"'' and S"' decks.<br />
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