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

Volume

1

fYear

1996

fDate

23-26 Sep 1996

Firstpage

505

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;

fLanguage

English

Publisher

ieee

Conference_Titel

OCEANS '96. MTS/IEEE. Prospects for the 21st Century. Conference Proceedings

Conference_Location

Fort Lauderdale, FL

Print_ISBN

0-7803-3519-8

Type

conf

DOI

10.1109/OCEANS.1996.572841

Filename

572841