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 := 0.7; Athwartship F := O.A Fore/Aft Resulting Pressure on Sponson Plating: Compartment Dimensions: L:=9fft Ht:=15.1Jt P := 1000- — ft^ Maximum pressure allowed for sponson shell plating lAW CVN 76 Specs Area := L • Ht Area = 1.452x 10^ ft^ %_new ■■= P • Area F^^gw = 1 •452x 10^ lb P H := H = 15.528ft New Equivalent Head Psw Loading on Shell Plating: f 11.5 a := asin 1 ■ a = 49.47 Ideg U5.13J 3:=asin^- P=40.519deg %_new = Fv_new ' cos(p) + F^_„g^ • cos (a) ^V_new = ^ ■ ^Perma Vertical Load (Downward) '^Ajew - A ■ ^Perma Athwartship Load (Port) %_new = V • Wperma • cos(3) + A • Wpg^ia " cos (a) N_new P^^^^(v.cos(p) + A.cos(a)) ^Perma ~ ^^ ^ ■0471<strong>to</strong>r Weight of Perma Ballast® that cannot be exceeded 112
Calculations <strong>to</strong> Determine Strength Corrections:! 25in ■^min" H = 15.528ft K:=l C := 400ff^ 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 — < K yfU 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 = 26in - = Bin 2 blimit = 25.377in K • H 25.377 in is <strong>the</strong> maximum distance that <strong>the</strong> stiffeners can be apart and have no plastic deformation <strong>to</strong> <strong>the</strong> existing .25 in plating. The current stiffeners are located 26 in apart. It is recommended that <strong>the</strong> stiffeners be placed less than maximum distance apart. Therefore, adding a vertical stiffener in <strong>the</strong> middle of each existing stiffener on <strong>the</strong> shell sponson plating will put b at 13 in and meet <strong>the</strong> 25.377 in requirement. Results A combination of Lesser Weight Addition <strong>to</strong> meet <strong>the</strong> lOOOpsf limit along with adding a stiffener in <strong>the</strong> middle of each existing stiffener will alleviate any structural concerns. 113
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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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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 111: 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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