Simulation of Ringing in Offshore Systems under Viscous Loads
Publication: Journal of Engineering Mechanics
Volume 124, Issue 5
Abstract
In recent years, significant interest has been shown in identifying the nonlinear mechanisms that induce ringing in complex offshore structural systems. This high-frequency transient-type response has been observed in offshore systems, particularly in tension leg platforms (TLPs). Given the implications of this behavior on the fatigue life of TLP tendons, it is essential that ringing be considered in the overall response evaluation. This study uses a simplified structural model exposed to viscous-type loading to demonstrate several of the salient features observed in higher-order potential–type wave–induced loads. Ringing response in pitching mode caused by viscous-type loading is simulated on a cylinder piercing the water surface, and significant mechanisms reponsible for inducing ringing are delineated. Results clearly indicate that, under certain conditions, ringing-type response characteristics are captured under viscous-type loading. The cylinder characteristics are varied to ameliorate the system performance by altering the conditions conducive to ringing.
Get full access to this article
View all available purchase options and get full access to this article.
References
1.
Davies, K. B., Leverette, S. J., and Spillane, M. W. (1994). Ringing of TLP and GBS platforms. BOSS, McGraw-Hill, Inc., New York, N.Y.
2.
Faltinsen, O. M., Newman, J. N., and Vinje, T.(1995). “Nonlinear wave loads on a slender vertical cylinder.”J. Fluid Mech., Cambridge, U.K., 289, 179–198.
3.
Gurley, K., and Kareem, A. (1996). “Numerical experiments in ringing of offshore systems under viscous loads.”15th Int. Conf. on Offshore Mech. and Arctic Engrg., ASME, New York, N.Y.
4.
Gurley, K., Kareem, A., and Tognarelli, M.(1996). “Simulation of a class of non-normal processes.”Int. J. Non-Linear Mech., 31(5), 601–617.
5.
Hasselmann, K.(1962). “On the nonlinear energy transfer in a gravity wave spectrum, part I.”J. Fluid Mech., Cambridge, U.K., 12, 481–500.
6.
Hudspeth, R. T., and Chen, M.(1979). “Digital simulation of nonlinear random waves.”J. Wtrwy. Port Coast. and Oc. Div., ASCE, 105(1), 67–85.
7.
Jefferys, E. R., and Rainey, R. C. T. (1994). Slender body models of TLP and GBS “ringing.” BOSS, McGraw-Hill, Inc., New York, N.Y.
8.
Kareem, A. (1995). “The next generation of tuned liquid dampers.”Proc. of the First World Conf. on Struct. Control, Calif. Inst. Assn. for Struct. Control, Los Angeles, Calif.
9.
Kareem, A., Hsieh, C. C., and Tognarelli, M. A. (1994). “Response anal-
10.
ysis of offshore systems to nonlinear random waves part I: wave field characteristics.”Proc. of the Spec. Symp. on Stochastic Dyn. and Reliability of Nonlinear Oc. Sys., ASME, New York, N.Y., 39–54.
11.
Mo, O., and Moan, T.(1985). “Environmental load effect analysis of guyed towers.”J. Energy Resour. Technol., ASME, 107(1), 24–33.
12.
Natvig, B. J. (1994). “A proposed ringing analysis model or higher order tether response.”Proc., 4th Int. Offshore and Polar Engrg. Conf., ISOPE, Golden, Colo., 40–51.
13.
Stansberg, C. T.(1993). “Non-Gaussian properties of second-order sum frequency responses in irregular waves: a numerical study.”OMAE, Offshore Technology, ASME, 1, 481–489.
Information & Authors
Information
Published In
Copyright
Copyright © 1998 American Society of Civil Engineers.
History
Published online: May 1, 1998
Published in print: May 1998
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.