... to the classical critical fluid flow region. The obtained results indicate that a large unsymmetrical and bending deformation appear to the riser, the riser vibrates with 9-order mode in in-line direction and 6-order mode in cross-flow direction. The maximum root-mean-square (RMS) vibration amplitudes are about...

... et al. (2014). The supporting frame was forced to oscillate harmonically. In Fig. 1, the direction parallel to the forced support motion is referred as the in-line direction , while that vertical to the in-line direction and the axial direction is referred as the cross-flow direction . METHOD...

... by current have an influence on tendon in both in-flow and cross-flow directions. In this work, we focus to study the response in cross-flow direction. When the occurrence frequency of VIV coincide with the natural frequency of tendon, the amplitude of VIV-induced response increases rapidly...

... for the difference between VIV (vortex-induced Motion) and VIM, this paper recorded and analyzed the vibration response such as the time-displacement curve, the trajectory, frequency and motion amplitude, both in the in-line and the cross-flow direction. Introduction In recent years, research on the VIV (vortex...

... 21-26, 2015 Copyright © 2015 by the International Society of Offshore and Polar Engineers (ISOPE) ISBN 978-1-880653-89-0; ISSN 1098-6189 www.isope.org NUMERICAL APPROACH Pipeline Motion Solver A deep water pipeline can be modeled as a tensioned beam in the in- line and cross-flow directions...

... the probability of riser collision are presented. vibration cylinder artificial intelligence oscillation amplitude interaction cross-flow direction experiment circular cylinder coefficient engineering riser diameter collision interference downstream cylinder upstream cylinder arrangement...

... subsea system amplitude internal wave frequency inline direction test cylinder frequency upstream oil & gas stratified fluid horizontal force natural frequency vertical cylinder wave generator internal wave cross-flow direction 1 Investigation on the Dynamic Responses of Vertical...

... system mass coefficient equation cross-flow direction truss spar hydrodynamic force sway acceleration lift coefficient frequency phase angle fpso magnitude experiment stiffness floating production system Experimental Investigation on Lift Coefficient for a Truss SPAR Subjected to Vortex...

... ABSTRACT: In this study, a marine riser is subjected to excitations at its top with a certain period and amplitude in order to investigate the resultant vortexinduced vibration (VIV) effects. The strain in the inline and cross-flow directions of the riser is measured using a fiber Bragg...

... ABSTRACT: The object of this study is to develop the tool to analyze VIV(vortexinduced vibration) of a slender marine structure which may vibrate in inline and cross-flow directions due to the vortex shedding on the condition of top excitation with a period and an amplitude. KC(Keulegan...

... fatigue damage could be a main contributor under low reduced velocity and distinctly have a positive influence on that in cross-flow direction in the super-upper branch. INTRODUCTION The problems of vortex-induced vibration (VIV) have been paid more attention in recent years due to the demand...

... prediction model williamson bottom end riser drag coefficient riser model flexible riser lock-in event phase angle dynamic response modeling & simulation experimental data cross-flow direction vibration time history response displacement coefficient amplitude Dynamic Response...

... in an attempt to find an optimal strake configuration. The experiments were performed in a steady flow flume, with an elastically mounted rigid circular cylinder of 50 cm length and 5 cm outer diameter. The test cylinder was spring-supported in both the in-line and cross-flow directions. The measurements were...

... cross-flow motion diameter cross-flow diameter inline inline cylinder frequency inline motion motion trajectory flow speed motion magnitude motion frequency cross-flow direction water natural frequency Motion Trajectory of Bare and Suppressed Tubulars Subjected to Vortex Shedding at High...

..., the shedding process gives a vortex pattern in which the in-line excitation frequency is twice that in the cross-flow direction. A riser or a pipeline may be forced into resonant vibrations, as the natural frequency may coincide with the shedding frequency. Then the motion of the cylinder seems to control...