A Solution to the Inherent List on Nimitz Class Aircraft Carriers

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Design of Plating for Surface Ships, lAW General Specs (Section 100)| The transverse plating at Frames 165, 170, 175, and 180 is stiffened by 3 vertical stiffeners and 3 horizontal stiffeners <strong>to</strong> include a vertical girder that runs from <strong>the</strong> Main Deck <strong>to</strong> <strong>the</strong> shell plating above stringer #6. The largest section of transverse plating that is unstiffened is approximately a 24"X34.5" section of plate. An assumption was made that all vertical stiffeners are spaced equally apart. All structural analysis was performed on this section of plate. b := 24in a := 34.Sn AR := - AR = 0.696 a Wual •= •^^" Thickness of Plate, HTS H = 69.168ft Head of Water K := .94 For AR = 0.696, lAW with Table I of <strong>the</strong> General Specs (Section 100) C := 400ft"^ For HTS, No Set, lAW with Table I of <strong>the</strong> General Specs (Section 100) b —
Calculations <strong>to</strong> Determine Strength Corrections t ■ := .Sttn Thickness of Plate, HTS H = 69.168ft Head of Water (With new head of water calculated using maximum allowable ballast addition) K := .94 Assume AR remains .696 C := 40Qft'^ For HTS, No Set b = short dimension of <strong>the</strong> panel (inches) t = thickness of <strong>the</strong> plate (inches) C = Coefficient that is a function of <strong>the</strong> plating material and <strong>the</strong> location of <strong>the</strong> plating on <strong>the</strong> ship b C " — < K = coefficient that depends on <strong>the</strong> aspect ratio (AR) of <strong>the</strong> panel K-VH H = Head of salt water (feet) ''limit- 24in '•mm j KH^ ''limit = = 25.583in 25.583 in is <strong>the</strong> maximum distance that longitudinal stiffeners can be located apart and have no deformation occur <strong>to</strong> <strong>the</strong> .5 in plating. The transverse plating at Frame 165 has 3 horizontal stiffeners and 3 vertical stiffeners. The current horizontal stiffener spacing is approximately 24" and within <strong>the</strong> limiting width between stiffeners. As a result, <strong>the</strong> transverse plating at Frame 165 does not need <strong>to</strong> be stiffened. Frames 170,175 and 180 are similar in design. 107
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A Solution <strong
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Table of Contents Abstract 3 Acknow
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1.0 Introduction 1.1 Motivation Air
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class. Changes to
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classified into fo
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o Control the KG g
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the intact stabili
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for ships propulsion, respectively.
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combined with the
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1.3.7 Ballast Addition 1.3.7.1 Wate
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2% entrained air (by volume) in <st
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Tank name Tank volume Ballast type
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was successfully performed and <str
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of each tank's location was added,
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2.3 Preliminary Decision-Making Cos
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All further costin
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2.4 Structural Analysis One tank on
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this pressure. This resulted in a r
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2.4.1 Structural Modifications 2.4.
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Main Deck Shell FR 165 - FR 180 Tra
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2.4.1.3 Modifications to</s
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3.1 Final POSSE Results The minimum
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Table 6: Final Cost, Weight Additio
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Corrosion coupons are placed in all
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5.0 Recommendations 1. As can be se
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References [I] Design Data Sheet 07
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Page 89 and 90: structural Analysis for Compartment
Page 91 and 92: Resulting Pressure on Sponson Plati
Page 93 and 94: Calculations to De
Page 95 and 96: Stress Calculations: k = coefficien
Page 99 and 100: FR 165 - FR 180 Transverse Bulkhead
Page 101 and 102: Design of Plating for Surface Ships
Page 105: Main Deck Shell FR 165 - FR 180 Tra
Page 121 and 122: Stress Calculations: Stiffening k =
Page 123 and 124: Resulting Pressure on Shell Plating
Page 127 and 128: Stress Calculations for 227 I<stron
Page 129 and 130: Resulting Pressure on Inner Longitu
Page 137 and 138: Stress Calculations k = coefficient
Page 139 and 140: Resulting Pressure on Transverse Bu
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Page 153 and 154: MATERIAL WORK SHEET PERMA BALLAST®
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A Solution to the Inherent List on Nimitz Class Aircraft Carriers

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