A Solution to the Inherent List on Nimitz Class Aircraft Carriers

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oard 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. This equation is used for all plates whe<strong>the</strong>r <strong>the</strong>y are long or not, and <strong>the</strong> coefficient k also accounts for <strong>the</strong> effect of <strong>the</strong> aspect ratio a/b. Again, b is <strong>the</strong> short dimension of <strong>the</strong> panel and t is <strong>the</strong> plating thickness. Figure 1 illustrates graphically <strong>the</strong> stresses in rectangular plates under uniform lateral pressure. — 050 -^ 0 225 Of Stress k P l-j- ) k Depends on : piatt edge conditions Plote side ratio — b Position of point considered These k values are calculated from Elastic Small - Deflection plote <strong>the</strong>ory j taking Poisson's rotio i) « 0-3 12 14 1-6 18 2 0 2 2 2 i Figure 1: Stresses in rectangular plates under uniform lateral pressure [2] 38
2.4.1 Structural Modifications 2.4.1.1 Modifications <strong>to</strong> <strong>the</strong> 2'"' Deck There were actually three port sponson voids modeled in POSSE on <strong>the</strong> 2° deck. Due <strong>to</strong> existing geometrical similarities between <strong>the</strong> tanks, only compartment 2-165-8-V was analyzed for possible structural modifications. Basic dimensions and tank geometry can be seen below in Figure 2. FR 175 FR 180 Main Deck 4^ 9.83' 6 3/4" 2nd Deck S Tees, spaced 25" apart {30#) Figure 2: 2°" Deck Compartment 2-165-8-V It was found that only 281 I<strong>to</strong>ns of ballast could be added <strong>to</strong> this compartment in order not <strong>to</strong> exceed <strong>the</strong> 1000 psf sponson shell plating maximum pressure criteria. Table 3 shows <strong>the</strong> required structural modifications for compartment 2-165-8-V for a 281 I<strong>to</strong>n ballast addition at 200 Ib/ft^. All calculations are located in Appendix E. 39
Page 1 and 2: A Solution <strong
Page 3 and 4: A Solution <strong
Page 5 and 6: Table of Contents Abstract 3 Acknow
Page 7 and 8: 1.0 Introduction 1.1 Motivation Air
Page 9 and 10: class. Changes to
Page 11 and 12: classified into fo
Page 13 and 14: o Control the KG g
Page 15 and 16: the intact stabili
Page 17 and 18: for ships propulsion, respectively.
Page 19 and 20: combined with the
Page 21 and 22: 1.3.7 Ballast Addition 1.3.7.1 Wate
Page 23 and 24: 2% entrained air (by volume) in <st
Page 25 and 26: Tank name Tank volume Ballast type
Page 27 and 28: was successfully performed and <str
Page 29 and 30: of each tank's location was added,
Page 31 and 32: 2.3 Preliminary Decision-Making Cos
Page 33 and 34: All further costin
Page 35 and 36: 2.4 Structural Analysis One tank on
Page 37: this pressure. This resulted in a r
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
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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 97 and 98:
Page 99 and 100:
FR 165 - FR 180 Transverse Bulkhead
Page 101 and 102:
Design of Plating for Surface Ships
Page 103 and 104:
Page 105 and 106:
Main Deck Shell FR 165 - FR 180 Tra
Page 107 and 108:
Calculations to De
Page 109 and 110:
Page 111 and 112:
Page 113 and 114:
Calculations to De
Page 115 and 116:
Page 117 and 118:
Page 119 and 120:
Calculations to De
Page 121 and 122:
Stress Calculations: Stiffening k =
Page 123 and 124:
Resulting Pressure on Shell Plating
Page 125 and 126:
Calculations to De
Page 127 and 128:
Stress Calculations for 227 I<stron
Page 129 and 130:
Resulting Pressure on Inner Longitu
Page 131 and 132:
Calculations to De
Page 133 and 134:
Page 135 and 136:
Page 137 and 138:
Stress Calculations k = coefficient
Page 139 and 140:
Resulting Pressure on Transverse Bu
Page 141 and 142:
Calculations to De
Page 143 and 144:
Page 145 and 146:
Page 147 and 148:
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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