Title :
On multi-frequency vortex induced vibrations of long marine risers
Author :
Larsen, Carl M. ; Vikestad, Kyrre ; Vandiver, J. Kim
Author_Institution :
Dept. of Marine Structures, Norwegian Univ. of Sci. & Technol., Trondheim, Norway
Abstract :
The purpose of the present work is to improve the basic understanding of vortex induced vibrations of marine risers in a sheared current. More than one vortex shedding frequency will be seen along the riser, and interaction between frequencies is of particular interest. A new type of experiment with a circular cylinder supported by springs is described. The model is designed to identify damping and excitation for cases with more than one active frequency. Some results from the experiments are presented, and a discussion on how these results can be applied in a theoretical model for prediction of vortex induced vibrations is given
Keywords :
geophysical fluid dynamics; marine systems; oceanographic equipment; structural engineering; vibrations; vortices; circular cylinder; damping; excitation; flow oscillation; fluid dynamics; long marine riser; marine structure; marine technology; mechanical cable; multifrequency vortex induced vibration; ocean; oil drill pipe; petroleum industry; rope; sea; sheared current; spring supported; structural engineering; theoretical model; underwater pipe; vortex shedding frequency; Acceleration; Damping; Force measurement; Frequency; Hydrodynamics; Marine technology; Position measurement; Predictive models; Springs; Testing;
Conference_Titel :
OCEANS '96. MTS/IEEE. Prospects for the 21st Century. Conference Proceedings
Conference_Location :
Fort Lauderdale, FL
Print_ISBN :
0-7803-3519-8
DOI :
10.1109/OCEANS.1996.572841
