Design Report Guided Missile Submarine SSG(X) - AOE - Virginia ...
Design Report Guided Missile Submarine SSG(X) - AOE - Virginia ...
Design Report Guided Missile Submarine SSG(X) - AOE - Virginia ...
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<strong>SSG</strong>(X) <strong>Design</strong> – VT Team 3 Page 96<br />
5 Conclusions and Future Work<br />
5.1 Assessment<br />
Work carried out in Concept Development has shown that the baseline design was a good start for <strong>SSG</strong>(X).<br />
With the added wave induced drag calculated for snorkel, an increase in diesel fuel was necessary to meet snorkel<br />
endurance. Obtaining the high AIP endurance required a large amount of variable ballast to compensate for the<br />
heavy hydrogen-iron hydride. Compensated tanks could not be used with the hydride so internal compensating (trim<br />
and aux) tanks were required. Overall, the final concept baseline shows a close agreement with the specifications of<br />
the ORD and the original concept baseline, as seen in Table 61.<br />
Table 61 - Compliance with Operational Requirements<br />
Technical Performance Threshold Goal Concept Exploration Final Concept<br />
Measure<br />
BL/ ORD TPM Development BL<br />
Advanced Advanced<br />
Advanced<br />
Mission payload<br />
Passive/Active<br />
ranging sonar, 6 OB<br />
torpedo tubes,<br />
countermeasure<br />
launchers, 688 Class<br />
Sail masts, 12 VLS<br />
cells<br />
Passive/Active<br />
ranging sonar, 6 IB<br />
torpedo tubes,<br />
countermeasure<br />
launchers, <strong>Virginia</strong><br />
Class Sail masts,<br />
degaussing, 4 man<br />
lock-out trunk, 24<br />
Passive/Active<br />
ranging sonar, 6 IB<br />
torpedo tubes,<br />
countermeasure<br />
launchers, <strong>Virginia</strong><br />
Class Sail masts,<br />
degaussing, 4 man<br />
lock-out trunk, 24<br />
Passive/Active<br />
ranging sonar, 6 IB<br />
torpedo tubes,<br />
countermeasure<br />
launchers, <strong>Virginia</strong><br />
Class Sail masts,<br />
degaussing, 4 man<br />
lock-out trunk, 24<br />
VLS cells<br />
VLS cells<br />
VLS cells<br />
Propulsion<br />
CCD, 2xCAT 3512<br />
V12, Lead Acid<br />
batteries<br />
OCD/AIP, 2xCAT<br />
3512 V12 +<br />
2x500KW PEM,<br />
Zebra batteries<br />
OCD/AIP, 2xCAT<br />
3512 V12 +<br />
2x500KW PEM,<br />
Zebra batteries<br />
OCD/AIP, 2xCAT<br />
3512 V12 +<br />
2x500KW PEM,<br />
Zebra batteries<br />
Snorkel Endurance (nm) 4000 6000 5160 5610<br />
Sprint Endurance (hr) 1 2 .95 1.00<br />
AIP Endurance (days) 20 30 26 25.7<br />
Snorkel Speed (knots) 12 12 12 12<br />
Sprint Speed Vs (knots) 15 22 22 22<br />
AIP Speed (knots) 5 5 5 5<br />
Crew size 29 29 29 29<br />
Diving Depth (ft) 500 1000 1000 1000<br />
5.2 Summary of Changes Made in Concept Development<br />
Concept Development for <strong>SSG</strong>(X) brought centered the balancing of the submarine at submerged and surfaced<br />
conditions. Main ballast tanks had to be moved forward and increased to create level trim and proper freeboard at<br />
the surfaced condition. The auxiliary ballast tanks were constantly moving and increasing to get all of the load<br />
points inside the equilibrium polygon. With the aft end of the ship predominantly heavy and creating a trim, the<br />
majority of the auxiliary tank space created was placed towards the stern to balance the weight. Change to the clean<br />
and compensating fuel tanks was on going because no moment difference had to be created when either full or<br />
empty. Internal and space arrangements were affected by the addition of two water tight bulkheads placed just<br />
forward of the MMR and just aft of the Torpedo room. The reasoning behind this addition was to isolate the<br />
hydrogen fuel and torpedoes. The MMR and AMR saw several variations to get the propulsion, hydraulic, and air<br />
systems together. Rearrangements were also made to allow for movement from one room or deck to another and for<br />
access to various pumps or equipment which may require maintenance.<br />
5.3 Future Work<br />
The following will be implanted on the <strong>SSG</strong>(X) the next time around the design spiral:<br />
• Shaping of the bow to delay transition from laminar to turbulent flow until aft of the sonar dome