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) Panels of plating shall be proportioned so as not <strong>to</strong> exceed <strong>the</strong> breadth-thickness ratios found below: b := 2fin a := 240in AR := — AR = 0.108 a âctual :== •25in Thickness of Plate, HTS H = 18.524ft 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 c ■ — /H 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) K-VHb ,, rr,, ... *min ■" "^ Note: The stirfeners are assumed <strong>to</strong> be spaced evenly across C <strong>the</strong> sponson shell plating with 6 stiffeners spanning 15.13'. ^min = 0.28in 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 92
Calculations <strong>to</strong> Determine Maximum Ballast Weight: Ship Motion Fac<strong>to</strong>rs: V:=1.2f Vertical A := 0.7f Athwartship F := 0.4 Fore/Aft Resulting Pressure on Sponson Plating: Compartment Dimensions: L := 60ft Ht := 15.13ft Area := L • Ht P ■= 1000- •— ft^ Area = 907.8ft^ Maximum pressure allowed for sponson shell plating lAW CVN 76 Specs FN_new == ? " Area FN_new = 9.078x 10^ lb p H := H = 15.528ft Psw New Equivalent Head Loading on Shell Plating: . f 11.5 a := asm U5-13 a = 49.47 Ideg P := asinf-^ I P = 40.519deg pN_new = Fv_new ' cos(p) + F^jiew " 'ôs(a) Py new = ^ ■ Wperma V^îcal Load (Downward) FA_new = ^ • Wp^^^ Athwartship Load (Port) % new = V • Wperma " cos(p) + A • Wp^^^ • cos (a) N_new ^P^^ ''^ (v.cos(p) + A.cos(a)) ^Perma = 281.9041<strong>to</strong>n Weight of Perma Ballast® that cannot be exceeded 93
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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.
Page 41 and 42: Main Deck Shell FR 165 - FR 180 Tra
Page 43 and 44: 2.4.1.3 Modifications to</s
Page 45 and 46: 3.1 Final POSSE Results The minimum
Page 47 and 48: Table 6: Final Cost, Weight Additio
Page 49 and 50: Corrosion coupons are placed in all
Page 51 and 52: 5.0 Recommendations 1. As can be se
Page 53 and 54: References [I] Design Data Sheet 07
Page 55 and 56: O CO ■*. CM d CVI d CVI d CO d CO
Page 57 and 58: 1
Page 59 and 60: ■ • s*; eo 1 CM ■
Page 61 and 62: ■ E 1- < O Y < ^^ i SS! m c in in
Page 63 and 64: ON OC) 00 00 o o o ^ < ^ < o 00 o I
Page 65 and 66: «n < 1-H ON H ^ 0\ 1—1 i-( o ©
Page 67 and 68: in -^J r-- OS H 00 ■* ri o F^^ ^
Page 69 and 70: =» * o o o o o o o § § < S , , s
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
Page 79 and 80: 1^ r-( 1-H M n
Page 81 and 82: Vi ^■ ««■ -^ ^^ * * o o o o o
Page 83 and 84: 4t S C/l r/i 00 * s M * o * < ly) C
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: Resulting Pressure on Sponson Plati
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 107 and 108: Calculations to De
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 and 144:
structural Analysis for Compartment
Page 145 and 146:
Design of Plating for Surface Ships
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Stress Calculations: k = coefficien
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__ — __ — """ " *c; 1— ai S s
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o ON H 00 ^ ^ o > o -o B u H r^ 00
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MATERIAL WORK SHEET PERMA BALLAST®
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*• en * 5fc M S 00 00 * yj c« 1/
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CO 5t CO 00 en St 0\ CO 5t o © St
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* 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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