A Solution to the Inherent List on Nimitz Class Aircraft Carriers

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5) <strong>the</strong> latest estimates for next overhaul, 6) <strong>the</strong> latest Availability FYOl Planned Incremental Availability (PIA), and 7) LCS at 50%. A Lightship Condition of 81,450.69 I<strong>to</strong>ns and a Combat Load Condition of 104,263.10 I<strong>to</strong>ns were obtained from <strong>the</strong> CVN 72 Weight and Moment Baseline report and used for modeling purposes. These values are from before <strong>the</strong> latest correction for unknown growth was applied. Included in Table 1 are <strong>the</strong> current CVN class predictions with <strong>the</strong> most recent unknown growth corrections applied. This is an extremely important chart because it shows each carrier's delivery data and class predictions for displacement, KG, and list. The VCG, LCG, TCG, and volume of each tank being analyzed was <strong>the</strong>n checked and modified if necessary <strong>to</strong> ensure accurate stability and analytical results. These naval architecture parameters were checked against <strong>the</strong> compartment and access database for CVN 70. Normally, one would use <strong>the</strong> ship's lines drawings and develop <strong>the</strong> hull up <strong>to</strong> <strong>the</strong> bulkhead and freeboard decks (i.e. <strong>the</strong> highest level <strong>to</strong> which <strong>the</strong>re will be watertight/structural salvage operations). On <strong>the</strong> basis of this modeling, one checks <strong>the</strong> hydrostatics and curves of form against <strong>the</strong> builder's documents <strong>to</strong> determine if <strong>the</strong> hull has been modeled correctly. Any freely flooding area above <strong>the</strong> freeboard deck will generally be left off <strong>the</strong> hull model unless <strong>the</strong> deck is a strength deck (i.e. part of hull girder bending). The 2"'' deck sponson voids had <strong>to</strong> be added <strong>to</strong> <strong>the</strong> model because <strong>the</strong>y were not included previously and POSSE is normally only utilized <strong>to</strong> model what is inside <strong>the</strong> ship's hull. Builder's lines drawings were not used, however, because salvage and hydrostatic work was not needed for purposes of this project. Instead, weights and centers were input <strong>to</strong> model <strong>the</strong> CVN 72 data <strong>to</strong> determine and correct <strong>the</strong> ship's list. After careful accounting 28
of each tank's location was added, verified, or corrected, <strong>the</strong> file was imported in<strong>to</strong> <strong>the</strong> POSSE program so that a combat load could be applied. The combat load condition was <strong>the</strong>n modified <strong>to</strong> reflect <strong>the</strong> current CVN 72 baseline combat load data mentioned previously as constants in <strong>the</strong> POSSE plan that was newly created. This includes a correction for: 1) crew and effects, 2) aviation ammunition, 3) ship ammunition, 4) provisions and s<strong>to</strong>res, 5) general s<strong>to</strong>res, 6) lube oil, 7) potable water, 8) reserve and emergency feed water, 9) oxygen and nitrogen production plant, 10) JP-5 aviation fuel, ll)gasohne, 12) aircraft, 13) aviation yellow gear, 14) aviation lube oil, 15) onboard discharge s<strong>to</strong>rage tanks, and 16) bilge and oily water. Then, <strong>to</strong> reflect CVN 71 AOC results, a miscellaneous weight correction fac<strong>to</strong>r was added at <strong>the</strong> combat load condition TCG, VCG, and LCG. Now, <strong>the</strong> combat load condition was 29
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: was successfully performed and <str
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 and 40: 2.4.1 Structural Modifications 2.4.
Page 41 and 42: Main Deck Shell FR 165 - FR 180 Tra
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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structural Analysis for Compartment
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Resulting Pressure on Sponson Plati
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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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Calculations to De
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Calculations to De
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Stress Calculations: Stiffening k =
Page 123 and 124:
Resulting Pressure on Shell Plating
Page 125 and 126:
Calculations to De
Page 127 and 128:
Stress Calculations for 227 I<stron
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Resulting Pressure on Inner Longitu
Page 131 and 132:
Calculations to De
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Stress Calculations k = coefficient
Page 139 and 140:
Resulting Pressure on Transverse Bu
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Calculations to De
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A Solution to the Inherent List on Nimitz Class Aircraft Carriers

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