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

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SSG(X) Design – VT Team 3 Page 90 Weight (ltons) 800 700 600 500 400 300 200 100 Empty Aux2 Empty Aux3 Empty ATT Empty Aux1 Flood FTT SSG(X) Equilibrium Polygon Empty FTT Flood Aux1 Flood Aux3 Flood ATT Flood Aux2 0 -10000 -5000 0 5000 10000 15000 Moment (ltons-ft) 20000 25000 30000 35000 40000 Figure 91 - Initial Equilibrium Polygon with Loading Conditions Once the loading conditions were positioned on the plot with the polygon, the next task was to get all of the points inside of the polygon. The CGs of all of the components were moved to accomplish this task. The compensating fuel tank and the clean fuel tank were both moved so that their CGs were the same. This was done so that when all of the fuel was used, there would be no extra moment created by having salt water in the compensating diesel tank and an empty clean fuel tank. The amount and position of the lead was also altered to move all of the loading conditions inside of the equilibrium polygon. The position and size of all external tanks were also changed. 4.9.2 Final Weights The LCB of the ship was taken to be at the volumetric center of the buoyant volumes of the submarine. The LCB is 119 ft. from the bow. A summary of the weights by SWBS code and the lightships weight are listed in Table 58. The weights spreadsheet organized by SWBS (single and multi digit codes) is provided in appendix F. Table 58 – Final Lightship Weight Summary SWBS Group Weight (lton) VCG (ft) LCG(ft) (fwdLCB) 100 1220 -0.29 3.66 200 335 -2.55 -50.1 300 45.0 -2.40 -33.4 400 160 1.52 76.5 500 178 1.09 -0.62 600 58.0 0.73 9.52 700 50.0 0.55 32.0 8 (Lead) 315 -15.0 27.0 F10 3.11 0.00 -10.2 F20 87.0 0.28 33.8 F30 5.27 4.24 63.4 F40 841 -5.64 -13.3 F50 16.0 -20.0 -7.65 Total (LS+8) 2360 -2.34 3.80 Condition A 2360 -2.34 3.80 Condition A-1 2045 -0.39 0.23 NSC 3310 -3.18 0.28
SSG(X) Design – VT Team 3 Page 91 4.9.3 Final Loading Conditions The loading conditions used are the Normal Condition, Light #1, Heavy #1, Heavy #2 (mines), Heavy Forward #1, Heavy Forward #2, and Heavy Aft. A table of the final loading conditions can be seen in Appendix F. Figure 92 shows the final equilibrium polygon with all of the loading conditions inside of it. 4.9.4 Final Equilibrium Polygon The final calculations for the boundaries of the equilibrium polygon are shown in Table 59. Figure 92 shows the final equilibrium polygon. Table 59 – Construction of Polygon Boundaries Tanks Filled Volume (ft3) Weight (lton) Moment Empty 0 0 0 Forward Trim Tank (FTT) 1472 42.06 2861.08 FTT + Aux 1 (A1) 2615 74.71 4630.39 FTT + A1 + A2 7956 227.31 9708.66 FTT + A1 + A2 + A3 12490 356.86 10910.59 FTT + A1 + A2 + A3 + A4 22047 629.91 6481.15 FTT + A1 + A2 + A3 + A4 + A5 24765 707.57 3474.13 FTT + A1 + A2 + A3 + A4 + A5 + ATT 26091 745.46 1552.50 A1 + A2 + A3 + A4 + A5 + ATT 24619 703.40 -1308.57 A2 + A3 +A4 + A5 + ATT 23476 670.74 -3077.88 A3 + A4 + A5 + ATT 18135 518.14 -8156.15 A4 + A5 + ATT 13601 388.60 -9358.09 A5 + ATT 4044 115.54 -4928.64 Aft Trim Tank (ATT) 1326 37.89 -1921.63 Empty 0 0 0 Weight (ltons) 800 700 600 500 400 300 200 Empty Aux3 Empty Aux4 Empty Aux2 SSG(X) Equilibrium Polygon Empty FTT Empty Aux1 Flood ATT Flood Aux 5 Flood Aux4 Flood Aux3 Flood Aux2 100 Empty Aux 5 Flood Aux1 0 Empty ATT Flood FTT -15000 -10000 -5000 0 Moment (ltons-ft) 5000 10000 15000 Polygon Normal Condition Light Heavy Heavy (Mines) Heavy Forward #1 Havey Forward #2 Heavy Aft Figure 92 - SSG(X) Equilibrium Polygon
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Design Report Guided Missile Submarine SSG(X) - AOE - Virginia ...

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