A Solution to the Inherent List on Nimitz Class Aircraft Carriers

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Calculations <strong>to</strong> Determine Maximum Ballast Weight:] Ship Motion Fac<strong>to</strong>rs: V:=1.2f Vertical A :- 0.11 Atiiwartship F := O.A Fore/Aft Resulting Pressure on Deck Plating: Compartment Dimensions: L := 20ft W := 4ft Area := L-W Area = 80ft^ H = 27.7ft Based on Maximum Equivalent Head or Design Load ^new '■' ^'Psw ^new ~ 12.388— in %_new ■" ^new'^^^ pN_new = 1-427x10^ lb Loading on Deck Plating: F — F N_new ~ ^V_new ^V new ~ ^"^Perma Vertical Load (Downward) N_new ^Perma '■- V ^Perma ~ 50.9681<strong>to</strong>r Weight of Perma Ballast® that cannot be exceeded 118
Calculations <strong>to</strong> Determine Strength Corrections: tjni„:=.5in Thickness of Plate, OS H = 27.7ft Head of Water K - .78 Assume AR remains 1 C := 350ft'^ b — < • K-VH For OS, 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" KH ^limit'' ■■ 42.629in 42.629" is <strong>the</strong> maximum distance that <strong>the</strong> stiffeners can be apart and have no elastic deformation <strong>to</strong> <strong>the</strong> .5 in plating. The current stiffeners are located 40 in apart. Therefore, according <strong>to</strong> <strong>the</strong> Navy Formula, adding a stiffener <strong>to</strong> <strong>the</strong> deck plating will not be required IF 50 I<strong>to</strong>ns or less of ballast is added. Results Ei<strong>the</strong>r less ballast must be added <strong>to</strong> <strong>the</strong> 4th deck tanks OR stiffening of <strong>the</strong> deck plating must occur <strong>to</strong> be less than design load. The design load is <strong>the</strong> calculated head of water for that deck. Similarly, adding a stiffener down <strong>the</strong> middle of <strong>the</strong> deck plating would alleviate any structural concerns. Adding a stiffener cannot, however, be done due <strong>to</strong> <strong>the</strong> positioning of <strong>the</strong> plating. Welding would be required on <strong>the</strong> bot<strong>to</strong>m deck plating and a watch would need <strong>to</strong> be stationed on <strong>the</strong> o<strong>the</strong>r side of <strong>the</strong> deck. The tank below this 4th deck tank is foam filled and a fire watch cannot be stationed. Therefore, <strong>the</strong> 4th Deck is no longer an option unless <strong>the</strong> ballast weight <strong>to</strong> be added be decreased <strong>to</strong> less than 50 I<strong>to</strong>ns. 119
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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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■ • s*; eo 1 CM ■
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■ E 1- < O Y < ^^ i SS! m c in in
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ON OC) 00 00 o o o ^ < ^ < o 00 o I
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«n < 1-H ON H ^ 0\ 1—1 i-( o ©
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Page 71 and 72: i V) H % * l-H
Page 73 and 74: % H o o o © s * < © © o i^ © H
Page 75 and 76: * * H o o o o o o o o o e o o O o o
Page 77 and 78: M t» c« * ft ft H ft 00 O 00 r- O
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Page 81 and 82: Vi ^■ ««■ -^ ^^ * * o o o o o
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Page 85 and 86: ^5- Q © © © © © © o o © ©
Page 87 and 88: "~" ~ 00 s ^ SS o s ■g Q ■* ja
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 117: Design of Plating for Surface Ships
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®
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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