A Solution to the Inherent List on Nimitz Class Aircraft Carriers

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Table 3: Required Structural Modifications for 2-165-8-V Ship Structure Structural Modiflcations Sponson Shell Plating Add 7 vertical stiffeners (5" X 4" X 7.5# X T) (MS) Max Panel Plating Size: 13" X 181.56" Ship Shell Plating (Inner Longitudinal Bulkhead) No modifications required Transverse Bulkheads (Frames 165,170,175, and 180) No modifications required The sponson shell plating required <strong>the</strong> addition of 7 vertical stiffeners due <strong>to</strong> its thinner plating on <strong>the</strong> sponsons. The sponson shell plating is only 10.2# (.25") plate. The inner longitudinal bulkhead, which is really <strong>the</strong> ship shell plating, is 30.6# (.75") and <strong>the</strong> transverse bulkheads are 20.4# (.5"). Similarly, <strong>the</strong> transverse bulkheads are extensively stiffened, and <strong>the</strong> longitudinal stiffener has one large horizontal stiffener running down <strong>the</strong> center of <strong>the</strong> bulkhead. As a result, modifications <strong>to</strong> <strong>the</strong>se bulkheads were not required. A cross-sectional view of <strong>the</strong> transverse bulkhead at Frame 165 is shown in Figure 3. 40
Main Deck Shell FR 165 - FR 180 Transverse Bulkheads 20.4# (.5") 11.5' > Stringer #6 Girder 13 7/8" X 6 3/4" Tee- Ship Shell Plating 30.6# (.75") fr Sponson ^Plating 10.2 #(.251 2nd Deck Stringer #1 Shell Figure 3: 2 Deck Compartment 2-165-8-V, transverse section 4 th 2.4.1.2 Modifications <strong>to</strong> <strong>the</strong> 4" Deck As mentioned previously, <strong>the</strong> only structural analysis performed for <strong>the</strong> 4"^ deck void was on its deck plating. Once it was determined that deck stiffening would be required, <strong>the</strong> 4 deck tanks were taken out of consideration as a possible location for placing this ballast. The 4' deck voids do not have any stiffened plating. Although adding a stiffener down <strong>the</strong> middle of <strong>the</strong> deck plating would alleviate any structural concerns, welding <strong>to</strong> <strong>the</strong> deck plating could not be performed due <strong>to</strong> <strong>the</strong> foam filled void below and <strong>the</strong> inability <strong>to</strong> station a fire watch <strong>the</strong>re. Table 4, however, shows <strong>the</strong> structural modifications <strong>to</strong> <strong>the</strong> deck plating that would be necessary for ith 41
Page 1 and 2: A Solution <strong
Page 3 and 4: A Solution <strong
Page 5 and 6: Table of Contents Abstract 3 Acknow
Page 7 and 8: 1.0 Introduction 1.1 Motivation Air
Page 9 and 10: class. Changes to
Page 11 and 12: classified into fo
Page 13 and 14: o Control the KG g
Page 15 and 16: the intact stabili
Page 17 and 18: for ships propulsion, respectively.
Page 19 and 20: combined with the
Page 21 and 22: 1.3.7 Ballast Addition 1.3.7.1 Wate
Page 23 and 24: 2% entrained air (by volume) in <st
Page 25 and 26: Tank name Tank volume Ballast type
Page 27 and 28: was successfully performed and <str
Page 29 and 30: of each tank's location was added,
Page 31 and 32: 2.3 Preliminary Decision-Making Cos
Page 33 and 34: All further costin
Page 35 and 36: 2.4 Structural Analysis One tank on
Page 37 and 38: this pressure. This resulted in a r
Page 39: 2.4.1 Structural Modifications 2.4.
Page 43 and 44: 2.4.1.3 Modifications to</s
Page 45 and 46: 3.1 Final POSSE Results The minimum
Page 47 and 48: Table 6: Final Cost, Weight Additio
Page 49 and 50: Corrosion coupons are placed in all
Page 51 and 52: 5.0 Recommendations 1. As can be se
Page 53 and 54: References [I] Design Data Sheet 07
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Resulting Pressure on Sponson Plati
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Calculations to De
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Stress Calculations: k = coefficien
Page 97 and 98:
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FR 165 - FR 180 Transverse Bulkhead
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Design of Plating for Surface Ships
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Main Deck Shell FR 165 - FR 180 Tra
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Calculations to De
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structural Analysis for Compartment
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Calculations to De
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Calculations to De
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Stress Calculations: Stiffening k =
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Resulting Pressure on Shell Plating
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Calculations to De
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Stress Calculations for 227 I<stron
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Resulting Pressure on Inner Longitu
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Calculations to De
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Stress Calculations k = coefficient
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Resulting Pressure on Transverse Bu
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Calculations to De
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MATERIAL WORK SHEET PERMA BALLAST®
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A Solution to the Inherent List on Nimitz Class Aircraft Carriers

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