A Solution to the Inherent List on Nimitz Class Aircraft Carriers

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Resulting Pressure on Sponson Plating: Compartment Dimensions: L:=96ft Ht:= 15.13ft Area := L • Ht Area = 1.452x 10^ ft^ p P := P = 1.242x 10^ — P = 8.622— Area 2 .2 It m ^95% -"^ %erma_fill' ^ ^95% = ^ •179x 10 — Based on 95% Fillable Volume ft^ ^95% H := H = 18.315ft Equivalent Head Psw In accordance with CVN 76 Specs, sponson plating aft of Frame 88 shall be designed for 1000 psf. Therefore, less ballast must be added <strong>to</strong> <strong>the</strong>se sponson voids. 1179 psf > 1000 psf 110
Design of Plating for Surface Ships, lAW General Specs (Section 100) Panels of plating shall be proportioned so as not <strong>to</strong> exceed <strong>the</strong> breadth-thickness ratios found below: b := 26in a := lidn AR := - AR =: 0.108 a ^actual '•= -251" Thickness of Plate, HTS H = 18.315ft Head of Water K := 1 For AR = 0.108, 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 = 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 t K-VH H = Head of salt water (feet) l^.^ ■- —12t—'.— Note: The stiffeners are assumed <strong>to</strong> be spaced evenly across "^imn Q <strong>the</strong> sponson shell plating with 6 stiffeners spanning 15.13'. t^„ = 0.278in The minimum thickness calculated for this section of plate <strong>to</strong> meet Navy Structural Standards with no set is .28 in. The actual plate thickness is .25 in. Therefore, <strong>the</strong> 2nd deck shell plating must ei<strong>the</strong>r be stiffened or have less ballast added. It should be noted, however, that some structural margin exists within <strong>the</strong>se calculations and that .28 is close enough <strong>to</strong> .25 in. As a result, it is possible that stiffening is not required for <strong>the</strong> 2nd deck shell sponson plating. t min > t actual 111
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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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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 109: 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 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®
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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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