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Keywords: stiffness
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Proceedings Papers

Paper presented at the The Thirteenth ISOPE Pacific/Asia Offshore Mechanics Symposium, October 14–17, 2018
Paper Number: ISOPE-P-18-094
.... Fig. 1 shows the initiation and hand-over stages. regular wave load transfer 50 fpso tension transfer function stiffness subsea system truncation modeling numerical analysis diameter anchor point movement load transfer 0 top tension handover operation flexible riser riser...
Proceedings Papers

Paper presented at the The Thirteenth ISOPE Pacific/Asia Offshore Mechanics Symposium, October 14–17, 2018
Paper Number: ISOPE-P-18-008
... engineering different column corner radius column corner platform upstream oil & gas stiffness column corner radius vim Numerical Study of Column Rounded Corner Effects on Vortex-Induced Motions of Semi-Submersibles Siming Li, Weiwen Zhao, Decheng Wan* Collaborative Innovation Center...
Proceedings Papers

Paper presented at the The Twelfth ISOPE Pacific/Asia Offshore Mechanics Symposium, October 4–7, 2016
Paper Number: ISOPE-P-16-081
...-0.9 Hz. Designers must keep the first natural frequency of the OWT away from frequencies of all these external loads. rotation offshore wind turbine resistance renewable energy displacement wall thickness fundamental frequency dynamic response stiffness deflection wind load owt...
Proceedings Papers

Paper presented at the The Twelfth ISOPE Pacific/Asia Offshore Mechanics Symposium, October 4–7, 2016
Paper Number: ISOPE-P-16-166
... (Willis and West, 2001; Bridge and Willis, 2002; Bridge et al., 2003; Clukey et al., 2005; Hodder and Byrne, 2010). Experiments show that the riser- seabed interaction involves complex nonlinear process including trench profile, nonlinear soil stiffness, finite soil suction and breakaway of the riser from...
Proceedings Papers

Paper presented at the The Eleventh ISOPE Pacific/Asia Offshore Mechanics Symposium, October 12–14, 2014
Paper Number: ISOPE-P-14-005
... forces with the adjacent caissons. Further, it was also found that the larger the stiffness of the interlocking cable becomes, the larger wave dispersion effect. cable incident wave numerical analysis caisson breakwater breakwater caisson stability vertical direction tensile force...
Proceedings Papers

Paper presented at the The Tenth ISOPE Pacific/Asia Offshore Mechanics Symposium, October 3–5, 2012
Paper Number: ISOPE-P-12-082
... of hoisting system w/ and w/o passive heave compensator (kC : stiffness of crane wire, kH & bH: spring & damping of passive heave compensator) 55 Active Heave Compensator (AHC) An active heave compensator uses controlled winches, hydraulic pistons and reference signal. Active heave compensation systems...
Proceedings Papers

Paper presented at the The Ninth ISOPE Pacific/Asia Offshore Mechanics Symposium, November 14–17, 2010
Paper Number: ISOPE-P-10-014
... the relative angle between rotor and wind speed. This paper assumed that the tower is a cantilever and where the tower and spar- buoy connect is the fixed end. Table 3 shows the distributed tower bending stiffness of NREL 5MW wind turbine (Jonkman, Butterfield, et al, 2009). Because the tower is a beam...
Proceedings Papers

Paper presented at the The Eighth ISOPE Pacific/Asia Offshore Mechanics Symposium, November 10–14, 2008
Paper Number: ISOPE-P-08-037
... to find the nonlinear static configuration and large static strain. The natural frequencies and mode shapes are calculated by using the assumed-modes finite element method. The pipes/risers perform tensioned beam behavior when the bending stiffness dominates, and the stability of the pipes/risers reduces...
Proceedings Papers

Paper presented at the The Eighth ISOPE Pacific/Asia Offshore Mechanics Symposium, November 10–14, 2008
Paper Number: ISOPE-P-08-048
... system pile diameter nonlinearity local response strength pile nonlinearity engineering lateral load-displacement response soil nonlinearity pile length modeling soil-pile interaction stiffness interaction pile-soil system Modeling Soil-Pile Interaction for Nonlinear Analysis...
Proceedings Papers

Paper presented at the The Eighth ISOPE Pacific/Asia Offshore Mechanics Symposium, November 10–14, 2008
Paper Number: ISOPE-P-08-043
... but in many cases their rotational stiffness is hardly set free for the hinge connection. This paper integrates the analytical investigation and the design consideration for the effects of end supports on the free vibrations of a marine riser conveying fluid. It is well known that resonances of marine risers...
Proceedings Papers

Paper presented at the The Eighth ISOPE Pacific/Asia Offshore Mechanics Symposium, November 10–14, 2008
Paper Number: ISOPE-P-08-011
... ABSTRACT: This paper is concerned with the hydroelastic response of multiple floating beams connected together by mechanical joints with rotational spring stiffness under wave action. A frequency domain approach is developed for the hydroelastic analysis. The fluid is assumed...
Proceedings Papers

Paper presented at the The Sixth ISOPE Pacific/Asia Offshore Mechanics Symposium, September 12–16, 2004
Paper Number: ISOPE-P-04-005
.... Total capital expenditure is estimated at US$12.0 billion. stiffness dle topsides time history friction pendulum bearing installation strength bearing reservoir characterization foundation soil stiffness earthquake best estimate sle spectra subsea system fpb upstream oil...
Proceedings Papers

Paper presented at the The First ISOPE Pacific/Asia Offshore Mechanics Symposium, June 24–28, 1990
Paper Number: ISOPE-P-90-098
... of bouyancy from the c.g. of the ship Wave height ~ender or cable stiffness wave length Length of the ship Displacement mass of the ship Ajded mass of the ship Damping coefficient Reactive force in fender in x direct- ion r(t),r(t)Time depeDdent ship movement, velo- ,r(t) city and ~cceleration T Wave period W...
Proceedings Papers

Paper presented at the The First ISOPE Pacific/Asia Offshore Mechanics Symposium, June 24–28, 1990
Paper Number: ISOPE-P-90-152
... structure, a research program is carried out by the authors (1987,1989). classification impact load stiffness collided member modal synthesis deformation mode offshore structure vibration mode deformation equivalent stiffness time history substructure characteristic dominant mode...
Proceedings Papers

Paper presented at the The First ISOPE Pacific/Asia Offshore Mechanics Symposium, June 24–28, 1990
Paper Number: ISOPE-P-90-038
... analysis resistance constant normal stiffness shear displacement displacement pile displacement softening continuum upstream oil & gas strength normal stress stiffness increment randolph pile-soil interface contraction interface calcareous soil Proceedings 0/ the Ftrst Pacljic/Asla...
Proceedings Papers

Paper presented at the The First ISOPE Pacific/Asia Offshore Mechanics Symposium, June 24–28, 1990
Paper Number: ISOPE-P-90-096
... response of a IlDiel W1th bilinear stiffness is also d1scussed. KEYW)RDS: nonlinear wave-force, nonlinear stiffness, chaos, noise. 1. INl'RODtx:TION Nonl1near dynamic analysis 1S an essential part of the design of many offshore structures. Numerical analyses, inc1ud1ng nonlinear behav10r, are performed...
Proceedings Papers

Paper presented at the The First ISOPE Pacific/Asia Offshore Mechanics Symposium, June 24–28, 1990
Paper Number: ISOPE-P-90-039
... ABSTRACT: Shearbox tests under conditions of constant normal load and constant normal stiffness have been performed to investigate the interface response of piles in calcareous soil. Both monotonic and load and displacement controlled cyclic tests have been performed. Large displacement cyclic...
Proceedings Papers

Paper presented at the The First ISOPE Pacific/Asia Offshore Mechanics Symposium, June 24–28, 1990
Paper Number: ISOPE-P-90-040
... and piles of length 1.9 m with elastic springs are presented. The influence of soil stiffness in the dynamic response has been investigated. The point of virtual fixity at different depths of piles for different soil stiffness are discussed. Differences in natural frequency, mode shapes and maximum...
Proceedings Papers

Paper presented at the The First ISOPE Pacific/Asia Offshore Mechanics Symposium, June 24–28, 1990
Paper Number: ISOPE-P-90-097
... In the formulation the dynamic Interaction effects are estimated as hydrodynamic added mass hydrodynamic added damping and hydrodynamic added stiffness The response quantities are evaluated as root-mean squared values using a linear random vibration theory Numerical examples are presented to discuss the effects...

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