Design Report Guided Missile Submarine SSG(X) - AOE - Virginia ...

SSG(X) Design – VT Team 3 Page 47
After design 44 was selected, the variant was re-optimized to achieve maximum efficiency. The reoptimization
was based on maximizing OMOE with cost as an Independent Variable (CAIV) and risk (OMOR) as
upper constraints, which restricted the variant to not increase in cost or risk from the initial design 44 optimization.
The discrete variables (i.e. TORP, VLS, PROPtype, etc.) were held constant. The new optimization varied only the
continuous variables (i.e. LtoD, Diameter, Depth, etc.) to find the highest OMOE. The re-optimization techniques
were consistent with the ones described in Section 3.5. In Figure 36 the re-optimization results are shown. Run
Number 5 was selected as the final optimized variant. Run number 3 was not selected because it violated some
feasibility constraints and cost 20 million dollars more than the original design 44. Constraint violations less than
5% were allowed by the optimizer.
3.7 Baseline Concept Design
Figure 36 - Re-optimization Results
The result of Design 44 with the Variant 2 re-optimization is summarized in Table 30 through Table 35.
The goal diving depth of 1000 ft was achieved while still maintaining high speed and endurance. The
propulsion system uses an Open Cycle Diesel (OCD) for transit and AIP while on station. The propulsor is a rimdriven
permanent magnet motors with low signature. A degaussing system and significant automation are present
onboard. The goal reconfigurable torpedo room, VLS option, and lockout chamber are also included in this design.