A Study on Mooring Systems of an Offshore Floating Platform for Different Configurations

Abstract:

Moored systemsof floating platforms typically have mooring lines in groups,attached to hull of the platform in different configurations.Study on therestoring behaviour of these systemsfor variousparameters of mooring lines gives an insight to decide on the preliminary design of platforms.This paper includesparametric study on the behaviour of mooring systems for various symmetric, asymmetric configurations of the lines. To compute the restoring forces of the mooring system,quasi-static analysis has been adopted and a MATLAB code named QSAML has been developed, validated with experimental tests and used for the parametric study.It has been observed that, the restoring capability of mooring system reduces whenthe lines are placed away from the wave heading.For any wave heading, the variation in restoring behaviour of mooring system with symmetric configurations is insignificant up to relatively small excursions of the platform.

• Periodical: Applied Mechanics and Materials (Volume 567)
• Pages: 197-203
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.567.197
• Online since: June 2014
• Authors: Anurag Yenduri, Montasir Osman Ahmed, V. John Kurian
• Keywords: Configuration, Mooring Line, Quasi-Static Analysis, Station-Keeping Systems

References

[1] A. K. Agarwal, A. K. Jain, Dynamic behaviour of offshore spar platforms under regular sea waves, Journal of Ocean Engineering 30 (2003) 487-516.

DOI: 10.1016/s0029-8018(02)00034-3

[2] Jason I. Gobat, Mark A. Grosenbaugh, A simple model for heave-induce dynamic tension in catenary moorings, Journal of Applied Ocean Research 23 (2001) 159-174.

DOI: 10.1016/s0141-1187(01)00013-x

[3] M. B. Rosales, C. P. Filipich, Full modelling of the mooring non-linearity in a two-dimensional floating structure, International Journal of Non-Linear Mechanics 41 (2006) 1-17.

DOI: 10.1016/j.ijnonlinmec.2005.04.007

[4] M. J. Downie, J. M. R. Graham, C. Hall, A. Incecik, I. Nygaard, An experimental investigation of motion control devices for truss spars, Journal of Marine Structures 13 (2000) 75-90.

DOI: 10.1016/s0951-8339(00)00010-1

[5] R. Pascoal, S. Huang, N. Barltrop, C. GuedesSoares, Assessment of the effect of mooring systems on the horizontal motions with an equivalent force to model, Journal of Ocean Engineering 33 (2006) 1644-1668.

DOI: 10.1016/j.oceaneng.2005.09.005

[6] R. Pascoal, S. Huang, N. Barltrop, C. GuedesSoares, Equivalent force model for the effect of mooring systems on the horizontal motions, Journal of Applied Ocean Research 27 (2005) 165-172.

DOI: 10.1016/j.apor.2005.10.002

[7] Russel J. Smith, Colin J. MacFarlane, Statics of a three component mooring line, Journal of Ocean Engineering 28 (2001) 899-914.

DOI: 10.1016/s0029-8018(00)00058-5

[8] S. A. Mavrakos, V. J. Papazoglou, M. S. Trintafyllou, J. Hatjigeorgiou, Deep water mooring dynamics, Journal of Marine Structures 9 (1996) 181-209.

DOI: 10.1016/0951-8339(94)00019-o

[9] ZhihuangRan, Coupled dynamic analysis of floating structures in waves and currents, Ph. D Thesis, Texas A&M University, Texas, (2000).