Marine structures can experience loads coming from steep, non-linear waves. A transient response of the structure can be amplified in some circumstances due to phenomenon known as “ringing”. Exact conditions of the ringing response excitation are not well known and various definitions of what constitutes a ringing event appear in bibliography. This article aims at identification of ringing events for a slender marine structure subjected to the second order nonlinear irregular waves. Loads on the structure are calculated from Morison equation with extensions known as Rainey’s slender body theory. Consistent second order formulation for the flow kinematics above mean water level is employed. The excitation load is non-linear due to wave non-linearity, Morison equation’s drag term and non-linear inertia terms which can be found in Rainey’s formulation. The structure’s dynamic response is obtained by Finite Element calculations in time domain. Overall randomly-excited vibrations are analysed by statistical and spectral methods, and application of Continuous Wavelet Transform (CWT) is presented. The simulations show a number of sudden, high amplitude resonant events which can be classified as ringing.
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ASME 2011 30th International Conference on Ocean, Offshore and Arctic Engineering
June 19–24, 2011
Rotterdam, The Netherlands
Conference Sponsors:
- Ocean, Offshore and Arctic Engineering Division
ISBN:
978-0-7918-4438-0
PROCEEDINGS PAPER
Identification of Ringing Events for a Slender Tubular Marine Structure Available to Purchase
Bogdan Iwanowski,
Bogdan Iwanowski
FORCE Technology Norway AS, Sandvika, Norway
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So̸ren Astrup,
So̸ren Astrup
Talisman Energy Norge AS, Stavanger, Norway
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Marc Lefranc,
Marc Lefranc
FORCE Technology Norway AS, Sandvika, Norway
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Rolf Hansson
Rolf Hansson
FORCE Technology Norway AS, Sandvika, Norway
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Bogdan Iwanowski
FORCE Technology Norway AS, Sandvika, Norway
So̸ren Astrup
Talisman Energy Norge AS, Stavanger, Norway
Marc Lefranc
FORCE Technology Norway AS, Sandvika, Norway
Rolf Hansson
FORCE Technology Norway AS, Sandvika, Norway
Paper No:
OMAE2011-49511, pp. 419-432; 14 pages
Published Online:
October 31, 2011
Citation
Iwanowski, B, Astrup, S, Lefranc, M, & Hansson, R. "Identification of Ringing Events for a Slender Tubular Marine Structure." Proceedings of the ASME 2011 30th International Conference on Ocean, Offshore and Arctic Engineering. Volume 6: Ocean Engineering. Rotterdam, The Netherlands. June 19–24, 2011. pp. 419-432. ASME. https://doi.org/10.1115/OMAE2011-49511
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