4 - Memorial University of Newfoundland DAI

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7.37 MEM Thcorclicai Acceleration Spectral Dmsitia due ta wave Induced Vibralion (Intact Structure: Uaing White Noire Spec- trum) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ,171 7.38 MEM Thmreticai Accoicration Spectral Densities due to w&ve induad Vibration (Damaged Slrueture: Member10 Removed- Using White Noise Spectrum) . . . . . . . . . . . . . . . . . . 172 7.30 MEM Theoretical Acaieration Spctrai Densities due to wave Induad Vibration (Damaged Structure: Memben 10 and 68 Removed-Using White Noise Spectrum) . . . . . . . . . . . . 173 7.40 MEM Theoretical Acceleration Spectral Densities due to wave Induced Vibration (intact Structure: Using JONSWAP Spec- trum) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ,174 7.41 MEM Theoretical Aceelerntion Spectral Dcnsitiesdue to wave induced Vibration (Damaged Structure: Member70 Removed- Uaing JONSWAP Spectrum). . . . . . . . . . . . . . . . . . . 175 7.42 MEM Theoretical Aceelerstion Spectral Densities due to wave Induced Vibration (Damaged Structure: Members 70 and 68 Romovod-Using JONSWAP Spectrum) . . . . . . . . . . . . 176 7.43 Varialion of Damping in the X Direction (In-Air Tests). . . . . 117 7.44 Variation d Damping in the Y Direction (In-Air Tests). . . . . 178 7.45 Average X and Y Direction Damping Ratio Variations (InAir Tata-Uaing the Logarithmic Decrement Technique). . . . . . 180 7.45 Variation of Damping in the X Direction (In-Water Tests). . . 182 7.47 Vnriation of Damping in the Y Direction (In-Water Tests). . . 183 7.48 Average X and Y Direction Damping Ratio Variations (In- Wnlcr Tata-Using the Loguithmic Decrement Technique). . 184
7.49 Typical Measured lnput Wnve Spectrum at Wnve Pmbc 1'1 (Measured White Noise Spectrum: Uaing Conventiounl FFr Pmeduru). ............................ La7 7.50 Measured Input Wave Spectra a1 Wave probes PI, P2 and 1'3 (Comparrd to theTheoretics1, Target, Whilc Noiso Spectrum- Uaing MEM). ........................... IRR 7.51 Typical Measured lnput Wave Spectrum at Wsvc Pcobe 1'1 (Measured JONSWAP Spectrum: Using Convontionnl IWT Pmceduru). ............................ 189 7.52 Measured lnput Wave Spectraat Wave pmbes PI, P2 and 1'3 (Compared to theThearelicnl,lhrgt. JONSWAI'Spcetntm- Uaing MEM). ........................... 190 7.53 Measured lnput WmImm PI and Oulput Accclcmlion Iab~s P4 (Results from the Regular Wave Tests). ........... 191 7.54 A Comparison Botwocn Experiment and Theory for thc Ilcg- ulsr Wave Tests (NB: Node 73 on tho Thmrctiml Modol Corresponds to the Position of Accelrrornoter Ad). ......... i9:I 7.55 Typical TimcDamain Accelerations Mcnsc~rrd With Accclcmon~- eten A1 to A4). .......................... 104 7.56 Typical FFT Experimentsl Aeeclcration Spectral Denlily dtna to Wave Induced Vibrations (intact Stnxctarc: Using Whilf Noiae Spectrum). ......................... 196 7.57 MEM Experimental Accelt-ation Spclral Dcnsitics d ~ lo c Wave Induced Vibrations (Intact Structure: Using While Noise Spectrum). ............................. 106
Page 5 and 6: NOTICE The quallty of this microfor
Page 7 and 8: I*I Et"" :lbL="*"" k.. bpilmsa7d Di
Page 9 and 10: Acknowledgements I should like lo t
Page 11 and 12: Abstract As a result of the increas
Page 13 and 14: Contents List of Figures xii List o
Page 15 and 16: 4.6.3 Fnbrieatiox of tllc Rcduced M
Page 17 and 18: A Selected Algoilthma 278 A.1 Diago
Page 19 and 20: 4.5 Member Configuration at level #
Page 21: 7.21 Dynamic Mode # 6 (Intact Model
Page 25 and 26: 7.66 hulls fmm Accelerometer A2 due
Page 27 and 28: D.ll DynamicMode # I (Intact Model)
Page 29 and 30: List of Tables 4.1 Symbols, Units a
Page 31 and 32: 8.9 Pacent Changes in Resonant Frrq
Page 33 and 34: List of Symbols d(k) .i(k) A A(L1 1
Page 35 and 36: autosp~trni density of r(t) cms-spe
Page 37 and 38: 0,1,2
Page 39 and 40: [@I a Pu. P. P:,," P.. o2(k) instan
Page 41 and 42: een recorded, then it is beneficial
Page 43: Associated with every vibration mod
Page 46 and 47: Such s model is called a dynamicall
Page 48 and 49: presenlcd. Chapter 3 contains the t
Page 50 and 51: al frequcncic. occurred when member
Page 52 and 53: detwM from the data roeorded (later
Page 54 and 55: y Duggan d a!. [a]. This study inve
Page 56 and 57: ~~lidity of the results war rompsro
Page 58 and 59: nic~~~aan:immcdiateiyuseful, they a
Page 60 and 61: tlncayatem hehavior oftrusswork pla
Page 62 and 63: Chapter 3 Theoretical Modelling Tll
Page 64 and 65: 3.2 Wave Theories Works by earlier
Page 66 and 67: F;-RY% WAVE THEORY) 1/20 I "w/Lw DE
Page 68 and 69: DIRECTION OF WAVE PROPAGATION FIG.
Page 70 and 71: liero, d and ita wlocity component
Page 72 and 73:
and and a+ "=-. OY = wA~inl~IW(1+ s
Page 74 and 75:
FIG.3.4 ARBITRARILY ORIENTED CYLIND
Page 76 and 77:
~i n long c mtd wave is being conai
Page 78 and 79:
inrther. Ultimately, the resulting
Page 80 and 81:
equcncia and mode shapes, equalion
Page 82 and 83:
Toestablish tho relationship betwee
Page 84 and 85:
Furthermore, from equation (3.56),
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lG.3.6 SIMULATED 3-D AND STICK MODE
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1. priam&tic heam members, 5. sir d
Page 92 and 93:
The equation of motion for each ele
Page 94:
From tho ~tatic dispiaeemont muita,
Page 97 and 98:
instance, the non-dimensional equal
Page 99 and 100:
functional relationship relating th
Page 101 and 102:
whcre F, 't iinstantanmua force at
Page 103 and 104:
Table 4.1 Symbols, Unit. and Dimens
Page 105 and 106:
thc Buckinghm r-Thmrem (i.c., I2 te
Page 107 and 108:
That is, equations (4.28) and (4.29
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C. Ilence, if the dynamic amplifica
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where (2) is the general gmmdric or
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the prolotype. Damping is dcfincd b
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2 LEVEL # 7 1 28956DO NOTE: ALL DIM
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Mataial= Structural Steel, E = 206.
Page 122 and 123:
LEVEL C6 NOTE: ALL DlMENStONS IN m
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Table 4.5 Relevant Materiel Propert
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FlG.4.9 COMPLETED STRUCTURE. 89
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Since the de& sertioo of the struct
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% FINITE ELEMENT ANALYSIS (COMPUTER
Page 136 and 137:
3 53 I CONTROL RM SECTION A-D. MEZZ
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I I SERVO CONTROLLER MODEL 408.1% j
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LEGEND FI B F2 FREE VlBllTlDN INITI
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5.1.4 Response Circuit Data acquisi
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I ~T.UG~U~E LEGEND: DYIIYT I., 10 A
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the basis upon which the irregular
Page 152 and 153:
then manipulated by the computer ro
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,.. G STRUCTURE IN STILL WATER STRU
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dter every set of hen wave excitati
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To gather spectral information fmm
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is the timelag between silrnplev~l~
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ics, with a lew notable exceptions,
Page 164 and 165:
If bath aides of the dove cguntion
Page 166 and 167:
Conversely, r(1) can be estimated b
Page 168 and 169:
quires ahout N(M + 1) + 9Y1 arithme
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So equation (6.18) become: I, i = C
Page 172 and 173:
At each resonant frequency, the hdl
Page 176:
6.5 Impact Testing Impact testa wer
Page 179 and 180:
Chapter 7 Theoretical and Experimen
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Table 7.1 Natural Wequeney Comparis
Page 188:
Therefore, with the natural freluen
Page 199:
Pi7 Be: kD! SF:& iid id . -5 i#@ Ba
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(i.o., at noder 6, 12, 18, 22 and 2
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tirne dntn;lis reprcsez~lnlioti of
Page 214:
-CUI~IW~~~ anstmr 9~1sn-mmu3n DL um
Page 218:
the posilivc and nogntivr peaks. Re
Page 224 and 225:
Table 7.7 X-Direction Results From
Page 226:
2 GEhEnnlEO FRDM TdE WrllTE hOISE l
Page 230 and 231:
FIG. 7.53 MEASURED INPUT WRVE FROM
Page 236:
'IUnU133dS 3SIR1 31IHI 9NISn--91 30
Page 244 and 245:
Table 7.9 MEM Damping Estimates fro
Page 246:
7.2.3 Impact Test Results In Chsptc
Page 252 and 253:
(K 01 0 01- OZ- DE- 0,- OBI (KI 09
Page 257 and 258:
Chapter 8 Discussion of Results In
Page 260 and 261:
of rnemhcr removal can he visually
Page 263 and 264:
emoved is a cancellation offecl, an
Page 265 and 266:
Force Variation Along the Jacket. P
Page 267:
fi~t on the lower rrequency end of
Page 271 and 272:
pond approximately to thasc which c
Page 273 and 274:
'Ikble 8.1 Measured Resonant Rsquen
Page 275 and 276:
Table 8.6 Measured Resonant Wequenc
Page 277 and 278:
After a close look at the measured
Page 279 and 280:
Table 8.11 Percent Changes in Reson
Page 281 and 282:
Table 8.16 Percent Changes in Reson
Page 283:
apprmiably. Since the tmnsa of the
Page 286 and 287:
'*~+12 \5 \8 h4 h7 $0 FREOUENCY IHz
Page 288 and 289:
8.2.4 Impact Test Results 'l'incobj
Page 293 and 294:
I able 8.20 Comparison of the Reson
Page 295 and 296:
'Phc invalidity of thc lumped mass
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Chapter 9 Concluding Remarks and Re
Page 299 and 300:
general agreement. 5. An investigat
Page 301 and 302:
mode, br example, might have been e
Page 303 and 304:
References K I'o,lnt~n~. 'A Sludy o
Page 305 and 306:
[21] .I.K. Vandiver, "Structo~ral D
Page 307 and 308:
1431 D.J. Kartewcg and G. d-Vria "O
Page 309 and 310:
1671 I..S. Marplo, "A NCW Autorepes
Page 311 and 312:
(111 J. Zhou "Ocean Wave Simulation
Page 313 and 314:
[Ill M.C. Ilallsm, N.J. Hcaf and L.
Page 315 and 316:
Appendix A Selected Algorithms Tllr
Page 317 and 318:
- M = the total mass of the slructu
Page 319 and 320:
Suhrtituting qualion (A.5) in equal
Page 321 and 322:
..3 Longuet-Higgins and Cokelet Smo
Page 323 and 324:
Appendix B Sample Calculations Typi
Page 325 and 326:
The dcnsity of ABS plsstic (p.,,) i
Page 327:
C.l Calibration and Instrumentation
Page 330:
D.l Mode Shape (Members 70 and 68 R
Page 340 and 341:
D.2 Results for an Impact Initiated
Page 343:
i W 4 P Li I 2: 5: E B '5 2- d :" i
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oa m 01 o or- QZ- oe- om Q Z ~ oo a
Page 353:
D.3 MEM Damping Estimates for the D
Page 357:
Table D.4 MEM Damping Estimate. fro
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4 - Memorial University of Newfoundland DAI

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