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 bulkhead is trapezoidal in shape with 3 vertical stiffeners at Frames 225 and 230 respectively. The transverse bulkhead is evenly divided in<strong>to</strong> 4 rectangular panels so that a cylindrical plate bending analysis can be performed on each panel. base := 30in Dimensions of small triangle ht=26.341in ht := sin(p)-base b := 3{)in a^ := 114in AR^ := — AR^ = 0.263 ^A aB:=114in-ht ag = 107.415iii ARg := — ARg = 0.279 aQ-a^-ht ac = 100.82CHn ARp :=— ARp = 0.298 ^D '•'= ^C ~^^ ^D = 94.244in AR^ := — AR^ =0.318 ^D ^actual -^ •^^^" Thickness of Plate, HTS H = 37.587ft Head of Water K := 1 For AR < 0.5, lAW with Table I of <strong>the</strong> General Specs (Section 100) C := 400ft' For HTS, No Set, I AW with Table I of <strong>the</strong> General Specs (Section 100) b — /Hb Vin = 0.46in The minimum thickness calculated for this section of plate <strong>to</strong> meet Navy Structural Standards with no set is .46 in. The actual plate thickness is .375 in. Therefore, <strong>the</strong> 8th deck transverse plating at Frame 225 must be stiffened. t_min »t actual 140
Calculations <strong>to</strong> Determine Strength Corrections: tj^„:= .37511 H = 37.587ft K:= 1 C := 400ft'^ b — < K-VH Thickness of Plate, HTS Head of Water (With new head of water calculated using maximum allowable ballast addition) Assume AR remains less than .5 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 K = coefficient that depends on <strong>the</strong> aspect ratio (AR) of <strong>the</strong> panel H = Head of salt water (feet) *'limit • min b = 30in ^=15in 2 KH ■'limit'' 24.466in 24.466 in is <strong>the</strong> maximum distance that vertical stiffeners can be located apart and have no deformation occur <strong>to</strong> <strong>the</strong> .375 in plating. The transverse bulkhead plating has 3 vertical stiffeners It is recommended that a stiffener be placed between <strong>the</strong>se existing vertical stiffeners. Therefore, adding 4 stiffeners <strong>to</strong> <strong>the</strong> transverse bulkhead plating will put b at approximately 15 in and meet <strong>the</strong> 24.466 in requirement^ ^ 141
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A Solution <strong
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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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O CO ■*. CM d CVI d CVI d CO d CO
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1
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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 and 106: 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: Resulting Pressure on Transverse Bu
Page 149 and 150: __ — __ — """ " *c; 1— ai S s
Page 151 and 152: o ON H 00 ^ ^ o > o -o B u H r^ 00
Page 153 and 154: MATERIAL WORK SHEET PERMA BALLAST®
Page 155 and 156: *• en * 5fc M S 00 00 * yj c« 1/
Page 157 and 158: CO 5t CO 00 en St 0\ CO 5t o © St
Page 159: * CO * * vT 00 * in r4~ vT * cr C/l
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A Solution to the Inherent List on Nimitz Class Aircraft Carriers

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