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Investigations with a bandwidth measure for fatigue assessment of the Foinaven dynamic umbilical including VIV by F. Trarieux; G.J. Lyons; M.H. Patel is a Engineering article available to read on EtoBox.

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An innovative use of a method to detect Vortex Induced Vibration (VIV) bandwidth in the curvature data of subsea flexible risers and umbilicals is presented. The parameter epsilon gives a valuable estimate of the bandwidth of signals such as VIV as a single value which may be used to track the behaviour with time and against other measures such as current speed. The method is conveniently based on a peak counting approach originally used in a marine context by Cartwright and Longuet-Higgins. Low epsilon values close to zero indicate a narrow-band process whereas values near unity indicate a broad-band process. Curvature and environmental data were gathered by the Foinaven Umbilical Monitoring System (FUMS) installed on the Foinaven Petrojarl IV floating production unit located in the Atlantic margin, west of Shetland. The VIV frequency range owing to current excitation considered is that in the range 0.2-2 Hz. This paper presents analyses showing the correlation of the epsilon bandwidth parameter with standard deviation of curvature, current speed and spectral analysis results for extended periods measured on the Foinaven dynamic umbilical. Examination of the number of frequencies

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Author

F. Trarieux; G.J. Lyons; M.H. Patel

Publisher

Elsevier Science; Elsevier ; Elsevier Ltd.; Elsevier BV (ISSN 0141-0296)

Published

2006

Language

EN

Field

Engineering (Physical Sciences)