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

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SSG(X) Design – VT Team 3 Page 46 with several visible knees (the circled designs). Knees in the curve are the top of a region where there is a substantial increase in effectiveness for a slight increase in cost. Design 44, a high risk, moderate cost, but very effective design is a knee in the curve, as indicated. Design 44 was chosen because of its dominance of effectiveness at a moderate cost. The design also contains higher risk systems that were more interesting and appealing. (Unlike program managers, students like risk). OMOE 0.95 0.9 0.85 0.8 0.75 0.7 0.65 0.6 0.55 Figure 34 - Non-Dominated Frontier. Run 44 Low Risk (
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.
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