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

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SSG(X) Design – VT Team 3 Page 62 Stability Data 250 200 150 100 Righting Arm (feet, feet^2, feet^3, long tons, deg) 50 0 24 24.5 25 25.5 26 26.5 27 27.5 28 28.5 Draft Figure 47 - Curves of form Normal Surface Condition 0.4 0.3 0.2 0.1 0 -6 -4 -2 0 2 4 6 -0.1 -0.2 -0.3 -0.4 Heel Angle (degrees) Figure 48 - Righting Arm Curves GMt GMl RM@1Deg Heel Trim Heel @ T = 24.201 Heel @ T = 24.701 Heel @ T = 25.201 Heel @ T = 25.701 Heel @ T = 26.201 Heel @ T = 26.701 Heel @ T = 27.201 Heel @ T = 27.701 Heel @ T = 28.201 4.3.8 Sail Figure 49 shows the sail with internal components labeled. The cross-section is a NACA 0020 airfoil, with the leading edge 70 feet aft of the nose of the submarine. The distance from the foremost point to the aftermost point (the chord) is 22 feet. The height of the sail is 15 feet. Section 4.10.2 presents further details about the sizing of the sail. The sail contains the snorkel, two photonics masts (AN/BVS-1), two AN/BRA-34 radars, two EHF/SHF HDR multibands, IEM, a AN/BPS-16 radar, and the Sea Sentry UAV. These items were determined from Concept Exploration.
SSG(X) Design – VT Team 3 Page 63 4.4 Structural Design and Analysis Figure 49 - SSG(X) Sail Structural analysis focuses on the pressure hull as it is the primary load bearer. The first phase involves determination of initial scantling values. Calculations are performed in ModelCenter using two MathCAD files – one for internal frames (Appendix G) and one for external frames (Appendix G) – to give values for the buoyancy factor, which is a measure of structural efficiency. Figure 50 shows the calculation of buoyancy factor for internal frames; Figure 51 shows the calculation of buoyancy factor for external frames. Figure 50 - Buoyancy Factor for Internal Frames Figure 51- Buoyancy Factor for External Frames The ModelCenter file (see Figure 52) is composed of seven modules: • Input: Provides common values of shell plating, flange and web thicknesses, flange width, and web height. • Mod1, Mod2, Mod3, Mod4: Calculate adequacy parameters and buoyancy factor for each module (see 4.4.1 for an explanation of module definition). These values differ between modules due to varying quantities for length between frames and length between bulkheads • BFwgtavg: Calculates an average buoyancy factor for the entire pressure hull weighted by the length of the module. • Optimizer: Minimizes structural weight by minimizing the weighted average buoyancy factor while maintaining sufficient adequacy parameters in each module. The values of web height, flange width, web thickness, and flange thickness are varied in order to optimize the structure. Figure 53 shows the dialog box in which options for the optimization are set.
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Design Report Guided Missile Submarine SSG(X) - AOE - Virginia ...

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