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OMAE2017-62584 Experimental Investigation of Power Umbilical Damping

OMAE2017-62584 Experimental Investigation of Power Umbilical Damping

Category
Part of a book/report
Abstract
Ocean currents may cause vortex induced vibrations (VIV) of deep-water umbilicals and cables. Since the VIV response may give significant contributions to the total fatigue damage it is important to know the structural damping for relevant curvature levels. A laboratory test has been performed on a 12.5 m long test specimen to determine the damping for a range of curvature levels that are in the vicinity of the stick-slip transition region. The energy input to maintain steady state oscillations with curvature amplitudes in the range 0.0002–0.001 m−1 was measured. The steady state energy input is consistent with damping ratios obtained using the free decay method. The structural damping depends on construction temperature and curvature and is less for typically low seawater temperature and low curvatures. The transition between the stick- and the slip regime is seen for typical seawater temperature.
Language
English
Author(s)
Affiliation
  • SINTEF Ocean / Energi og transport
Year
2017
Published in
International Conference on Offshore Mechanics and Arctic Engineering [elektronisk ressurs] : [proceedings]
ISSN
1523-651X
Publisher
ASME Press
Book
ASME 2017 36th International Conference on Ocean, Offshore and Arctic Engineering - Volume 5A: Pipelines, Risers, and Subsea Systems
Booklet
5A
ISBN
978-0-7918-5769-4