Table Of ContentHYDROELASTICITY IN M ARINE TECHNOLOGY
OF THE INTERNATIONAL CONFERENCE ON HYDROELASTICITY
IN MARINE TECHNOLOGY ITRONDHEIM/NORWAY 125-27 MAY 1994
Hydroelasticity in Marine
Technology
Edited by
0. FALTINSEN, C. M. LARSEN & T. MOAN
The Norwegian Institute of Technology
K.HOLDEN
MARINTEK
N.SPIDS0E
SINTEF
Boca Raton London New York
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Hydroelasticity i n Marine Technology, Faltinsen et a l. (eds) © 1994 B alkema, Rotterdam, ISBN 9 0 54103876
Table of contents
Preface IX
Risers
Prediction o f vortex-induced o scillation o f cylinders i n o scillatory f low 3
P.W.Beannan, XW.Lin & P.R.Mackwood
Hydroelasticity o f tensioned b uoyant p latform t ethers at low and negative tension 17
MHPatel, G1Lyons & T.Wilne
Vortex-induced v ibrations in a s heared f low: A n ew p redictive m ethod 31
MS. T riantafyllou, MA Grosenbaugh & R. G opalkrishnan
Riser r esponse to vertical c urrent p rofiles and regular w aves 39
s.
1 M N iedzwecki, G T horesen & Remseth
Response analysis of slender d rilling c onductors 47
H Nedergaard, E Bendiksen & K KAndreasen
Collision c riteria f or d eep-sea T LP r iser a rrays 55
EHuse
Response c alculation u sing an e nhanced m odel for structural d amping i n flexible risers 63
compared w ith f ull scale m easurements
T. D. Hanson, A Otteren & N. S(>dahl
A s tudy of the dynamics o f hanging m arine r isers 75
K Matsunaga & M O hkusu
Risers c ables a nd pipelines
Dynamic a nalysis of mooring underwater c able l ines 85
lWauer
Vortex shedding i nduced o scillations d uring p ipe laying 97
R. Bruschi, LE Malacari, E Torseletti & L Vitali
Vortex shedding i nduced o scillations o n p ipelines resting o n v ery uneven s eabeds: 115
Predictions and c ountermeasures
RBruschi, P .Simantiras, L Vitali & V.Jacobsen
v
Vortex-induced v ibrations o f structural m embers i n u nsteady w inds 131
Chen-Yang Fei & 1 K im Vandiver
Ships
Bending m oment o f ship h ull g irder c aused b y p ulsating b ubble o f underwater e xplosion 149
B S miljanic, N. Babanac & 1 Senjanavic
Speed d ependence o f the n atural m odes o f an e lastically s caled s hip m odel 157
K R iska & T. Kukkanen
Characteristics o f hydrodynamic l oads d ata f or a n aval c ombatant 169
B H ay, 1 B aume, A Engle & R. Rubel
Slamming a nd w hipping o f ships
Wave-induced s pringing a nd w hipping o f high-speed v essels 191
P F riis-Hansen, 1 J uncher J ensen & PTemdrup P edersen
Slamming l oads o n w etdecks o f multihull v essels 205
1 K Wllsvald & Q M F altinsen
Structural r esponse a nalysis o f cylinders u nder w ater i mpact 221
T. Shibue, A Ita & E N akayama
Springing o f ships
Hydroelastic analysis o f a S WATH i n waves 231
w.G Price, PTemarel & Al Keane
Hydroelastic r esponse a nalysis o f a h igh s peed m onohull 245
QA H ermundstad, MingKang. W u & T. Maan
Hydrodynamic a dded m ass o f a f loating vibrating s tructure 261
A N estegard & M M ejlcender-Larsen
Flexible c ontainers
Fabric a s construction m aterial f or m arine a pplications 275
G W land & 1 V .Aarsnes
Hydroelastic a nalyses o f a l ong f lexible t ube i n w aves 287
Rang Zhaa & M T riantafyllau
Computation o f wave i nduced m otions o n a f lexible container 301
D.EFathi, Chang-HaLee &IN.Newman
Skirt a nd b ag s ystems
Hydroelastic a nalysis o f surface e ffect s hip (SES) seals 311
PKaplan
VI
Hydroelastic b ehavior o f the f lexible bag s tern s eal o f a S ES 323
rVIstein & 0 Faltinsen
Effects o f combination m otions o n h ydrodynamic f orces induced o n b odies i n t he s ea 339
lMR.Graham, Y.D.Zhao, CY.Zhou & M1Downie
Floating airports
A p reliminary t o t he d esign o f a h ydroelastic m odel o f a f loating airport 351
Seok-WonLee & WCWebster
The m otions p erformance o f a m at-like f loating airport 363
P.Mamidipudi & WCWebster
Influence o f flexibility on t he m otions a nd d eflections o f an a irport-oriented f loating long 377
offshore structure
r H irayama, N Ma & S. Veno
Hydroelastic r esponse o f a f loating runway 389
R. C E rtekin, S. Q. Wang & HR. R iggs
Large f loating structures
Wave d rifting f orces on m ultiple c onnected f loating structures 403
M T akaki & Y.Tango
Hydroelastic a nalyses o f a s tructure s upported o n a l arge n umber o f floating legs 417
H Kagemoto & D. K P. Y ue
Dynamic r esponse o f flexible circular f loating islands s ubjected t o stochastic waves 433
and s eaquakes
rHamamoto
Author i ndex 446
VII
Hydroelasticity i n Marine Technology, Faltinsen et a l. (eds) © 1994 B alkema, Rotterdam, ISBN 9 0 5 410 3 876
Preface
Hydroelasticity is important t o many areas of m arine technology, such as offshore and deep water
systems, conventional and high-speed ships, floating airports, flexible containers of c oated fabrics
and fish farms. Analysis for design of s uch structures requires integration of h ydrodynamics and
structural m echanics a nd i nnovative u se o f theoretical and e xperimental t echniques. Often t here a re
experts on either hydrodynamics or s tructural mechanics while hydroelastic problems need to be
solved through a complete u nderstanding of b oth d isciplines. Also when d ealing with cases where
the environmental o scillatory l oads act q uasi-statically on a n elastic structure, increased interdisci
plinary e xpertise i n h ydrodynamics a nd s tructural m echanics s hould b e e ncouraged.
The p urpose o f the p resent c onference h as b een t o b ring t ogether e xperts on b oth h ydrodynamics
and structural dynamics from various fields of application and hence encourage exchange of
experience f rom d ifferent types o f hydroelastic p henomena.
One important application dealt with in t hese proceedings is the behaviour o f r igid and flexible
risers on f loating production platforms. The e ffect o f b oth oscillatory fluid motion and c urrent are
studied. Vortex-induced vibrations is one area of c oncern. Similar problems arise for cables and
pipelines. Impact loads due to waves (slamming) are considered both for conventional and
high-speed vessels. Both global and local hydroelastic effects are studied. The global effects are
called whipping. The l ocal hydroelastic effects due to slamming a re most pronounced f or wetdeck
slamming. The global steady state hydroelastic oscillations of s hips and Tension Leg Platforms
(TLPs) are called springing a nd a re dealt w ith in the proceedings. The i mportance o f s pringing for
ships i ncreases w ith i ncreasing s peed a nd/ or i ncreasing s hip l ength. Similar p roblems a re o f concern
for very large floating structures like floating airports. Hydroelastic behaviour o f membrane type of
structures like the seal bag system o f a Surface Effect Ship (SES) or f lexible containers is another
important t opic i n t he p roceedings.
NTH, M arch 1994
Odd F altinsen
IX
