A Solution to the Inherent List on Nimitz Class Aircraft Carriers

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Resulting Pressure on Transverse Bulkhead Plating: Compartment Dimensions: Ht := 114in Dimensions of rectangular section Width := 12an P := asm p = 12.68deg base := 120in Dimensionsof small triangle ht := sin(p)-base ht = 26.341in Area := Ht-Width - (.5-base ht) Area =1.21x 10* in^ P:=— P = 2.421x10^-!^ P = 16.81— Area 2 .2 It m P H := H = 37.587ft Equivalent Head Psw 144
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 := 30in a^ :- 114in ARA b ARA = 0.263 ^B = 114in-ht ^ = ag - ht ag = 107.415in a^ = 100.829in ARB ARQ b ^B b ARB = = 0.279 ARc = = 0.298 ^D := ac - ht aj) = 94.244in ARD b ^D ARD = 0.318 tactual := -31251 H = 37.587ft K:=l C:= = 400ft'^ Thickness of Plate, HTS Head of Water For AR < 0.5, lAW with Table I of <strong>the</strong> General Specs (Section 100) For HTS, No Set, lAW with Table I of <strong>the</strong> General Specs (Section 100) t c ■ K-VH 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) TTun K^Hb C ^min = 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 .3125 in. Therefore, <strong>the</strong> 8th deck transverse plating at Frame 230 must be stiffened. t min »t_actual 145
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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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structural Analysis for Compartment
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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 109 and 110: structural Analysis for Compartment
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
Page 143: structural Analysis for Compartment
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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®
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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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