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- -- - kt-1 ,*-I 0 3 6 9 12 15 18 21 24 27 30 WRVE FREOUENCY [Hz1 FIG. 7.61 TYPiCRL FFT EXPERIMENTRL RCCELERRTION SPECTRRL DENSITY DUE TO WRVE RCTION CINTRCT STRUCTURE: USING JDNSWRP INPUT WAVE SPECTRUM].
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NOTICE The quallty of this microfor
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I*I Et"" :lbL="*"" k.. bpilmsa7d Di
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Acknowledgements I should like lo t
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Abstract As a result of the increas
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Contents List of Figures xii List o
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4.6.3 Fnbrieatiox of tllc Rcduced M
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A Selected Algoilthma 278 A.1 Diago
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4.5 Member Configuration at level #
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7.21 Dynamic Mode # 6 (Intact Model
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7.49 Typical Measured lnput Wnve Sp
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7.66 hulls fmm Accelerometer A2 due
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D.ll DynamicMode # I (Intact Model)
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List of Tables 4.1 Symbols, Units a
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8.9 Pacent Changes in Resonant Frrq
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List of Symbols d(k) .i(k) A A(L1 1
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autosp~trni density of r(t) cms-spe
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0,1,2
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[@I a Pu. P. P:,," P.. o2(k) instan
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een recorded, then it is beneficial
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Associated with every vibration mod
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Such s model is called a dynamicall
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presenlcd. Chapter 3 contains the t
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al frequcncic. occurred when member
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detwM from the data roeorded (later
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y Duggan d a!. [a]. This study inve
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~~lidity of the results war rompsro
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nic~~~aan:immcdiateiyuseful, they a
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tlncayatem hehavior oftrusswork pla
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Chapter 3 Theoretical Modelling Tll
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3.2 Wave Theories Works by earlier
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F;-RY% WAVE THEORY) 1/20 I "w/Lw DE
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DIRECTION OF WAVE PROPAGATION FIG.
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liero, d and ita wlocity component
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and and a+ "=-. OY = wA~inl~IW(1+ s
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FIG.3.4 ARBITRARILY ORIENTED CYLIND
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~i n long c mtd wave is being conai
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inrther. Ultimately, the resulting
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equcncia and mode shapes, equalion
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Toestablish tho relationship betwee
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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
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The equation of motion for each ele
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From tho ~tatic dispiaeemont muita,
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instance, the non-dimensional equal
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functional relationship relating th
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whcre F, 't iinstantanmua force at
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Table 4.1 Symbols, Unit. and Dimens
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thc Buckinghm r-Thmrem (i.c., I2 te
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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.
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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
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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
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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,
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If bath aides of the dove cguntion
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Conversely, r(1) can be estimated b
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quires ahout N(M + 1) + 9Y1 arithme
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So equation (6.18) become: I, i = C
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At each resonant frequency, the hdl
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6.5 Impact Testing Impact testa wer
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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
Page 204: (i.o., at noder 6, 12, 18, 22 and 2
Page 208: 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 245 and 246: Table 7.10 MEM Damping Edirnate. fr
Page 248: 6 i I f DB1 011 09 0 03- OII- OBI-
Page 253: DEGREES -180 -110 -60 0 60 I80 (0 $
Page 258: w u computed. This may have rcnulte
Page 261: in7 It- @! 44z1 ..J ""l ifi s 8 ail
Page 264 and 265: ~h,: tranricnt to thc steady stale
Page 266 and 267: the rc:xllons* lavela lor thc non-l
Page 270 and 271: 8.2 Experimental Results 8.2.1 Tran
Page 272 and 273: theoretical results computd using t
Page 274 and 275: I Table 8.3 Mesaured Resonant FL.eq
Page 276 and 277: Table 8.7 Measured Resonant fiequen
Page 278 and 279: Table 8.8 Percent Chsngea in Resona
Page 280 and 281: Table 8.13 Percent Changer in Reson
Page 282 and 283: Momhv 70 Severed It may be recalled
Page 285 and 286: 'CISU XI01 31IH1--03AOU3U 85 OW OL
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Damping Estimates from the Force Re
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Baaed on the impact lent restalls a
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In all cases, tbe diserelmncics bct
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from a removnl of the stiffening co
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1. The methodsused in the design, m
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for the white noise and JONSWAP tes
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Finnily, it should be mentionad tha
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[9] 0. Loland A.C. Mnekenaie and R.
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1321 M.J. Bliss., "Multichannel Max
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(541 J. Peneirn and S. Tseng, "Thre
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Bibliography [I] 2. Yin 2. Chen and
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[26] D.E. Malen and E.A. Vaughnn "D
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1561 C.G. Salmon and J.E. Johnson,
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A.l Diagonalization of a Consistent
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A.2 Houbolt Algorithm This alg~rith
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- 1 ZJ = - At2(123 - *1t 4.1 tzd, .
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f - L(+ 16 ,-a + 6/,., + 8h + 3/j+,
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B.l Sample Calculations to Select M
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Appendix C Calibration Curve and In
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Appendix D Miscellaneous Thia appcn
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IIq I!" an$ gc:e "4": ii; $4- nl& 4
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US OZ OI 0 0,- OZ- IB- 081 OZ1 09 0
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P E a x I G 2.; 5 & "t I $2 $3 d a
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FIO. 0.27 RESULTS ATRCCELEROMETER R
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nble D.2 MEM Damping Enimates rrom
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