A Solution to the Inherent List on Nimitz Class Aircraft Carriers

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Stress Calculations: b^2 a := k-Pl — I k = coefficient that depends on <strong>the</strong> plate edge conditions, aspect ratio (AR) of <strong>the</strong> panel, and position of point being considered p = pressure based on 1000 psf on sponson shell plating b = panel width a = panel length t = plate thickness 'Siniply_supported '■= ■'^- "^lamped •= -^ ^ ^^'"^^ ^""^ "1°^' conservative a := 34.Sn b := 24in based on no stiffener addition P = 30.934— . 2 in t := .SOn *^max_allowable~ 40,000— I AW with <strong>the</strong> General Specs (Section 100) 2 in ^simply_supported ' *Simply_supported '^l b^2 '^simply_supported ~ "o in 2 ... b ^clamped " '^clamped ^clamped = 35636-^ in Maximum Allowable Stress for HTS is 40,000 psi. The calcuated stresses falls between that of simply supported and that of clamped. Simply supported and clamped structural cases are idealizations of structural member support illustrating zero stiffness and infinite stiffness, nei<strong>the</strong>r of which exists in any real-world structural system. On board ship, structural systems can be conveniently approximated by one or <strong>the</strong> o<strong>the</strong>r case, but in fact have stiffness between one or <strong>the</strong> o<strong>the</strong>r. Navy structural analysis is based off clamped ends, <strong>the</strong>refore <strong>the</strong> stress should be well below maximum allowable. '^clamped*^'^ ^max_allowabl( 108
structural Analysis for Compartment 2-180-6-V: Shell Plating Perma Ballast® Data PPerma^=200-^ ft ^"Perma_fill •= •^- Density of Perma Ballast® Based on 95% Fillable Volume Conversion Fac<strong>to</strong>rs I<strong>to</strong>n := 224ab 'sw : 64.4 lb ft Compartment 2-180-6-V Volume := 6272ft^ Wperma==56a<strong>to</strong>n Density of Seawater Volume of Compartment Weight of Permanent Ballast Ship Motion Fac<strong>to</strong>rs: V := 1.2f Vertical a := asin r n.5 15.13 A := 0.7f F := 0.4 Athwartship Fore/Aft P := asin f 9.83 15.13 a = 49.47 Ideg P =40.519deg Loading on Shell Plating: Wperma = ^■254x 10^ lb Weight of Perma Ballast® Fy := V • Wpgrma F^ :- A • Wpgj.j^g Fp := F • Wpgj.jjjg Fv=1.568x 10 lb F^ =9.408x 10^ lb Fp = 5.018x 10^ lb Vertical Load (Downward) Athwartship Load (Port) Fore/Aft Load F^ := Fy • cos(p) + F^ ■ cos(a) Fj^ = 1.803x 10^lb Normal Force 109
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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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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 107: 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 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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A Solution to the Inherent List on Nimitz Class Aircraft Carriers

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