Large scale testing for mooring line hydrodynamic damping
- University College London (United Kingdom)
Design of the mooring system required to hold a vessel within a specified watch-circle depends on an understanding of the imposed static and dynamic environmental loads. The low frequency excitation caused by random waves and wind loading results in resonant motion responses in the horizontal plane leading to high mooring line forces. Many of the loading mechanisms are well understood, however until recently the fluid induced forces acting on the moorings were assumed to have little influence on the vessel dynamic response. Recent work has shown that the mooring system may under certain circumstances provide up to 80% of the total damping available thus significantly reducing the peak line tensions, however design data is currently sparse. A severe drawback of much of the previous experimental work performed to measure line damping is associated with the relatively small geometric scale at which the model tests were performed (typically 1:100), and the fact that is difficult to apply the results to non-specific field scenarios. This paper presents continuing model testing work at University College London as part of a JIP study. The objectives of the testing are to provide added mass and drag contributions from the mooring line. The tests are being carried out at full to 1:3 scale on elements of line to ensure that the Reynolds number flow regime is as close as possible to that encountered at full scale. Line segments are tested at various inclinations and orientations to the flow to represent sections of single catenary mooring lines.
- OSTI ID:
- 449708
- Report Number(s):
- CONF-9606279-; ISBN 0-7918-1490-4; TRN: IM9714%%265
- Resource Relation:
- Conference: 14. international conference on offshore mechanics arctic engineering (OMAE), Florence (Italy), 16-20 Jun 1996; Other Information: PBD: 1996; Related Information: Is Part Of Proceedings of the 15. international conference on offshore mechanics and arctic engineering -- OMAE 1996. Volume 1, Part B: Offshore technology; Chakrabarti, S.K. [ed.] [Chicago Bridge and Iron Technical Services Co., Plainfield, IL (United States)]; Pontes, M.T. [ed.] [Inst. Nacional de Engenharia e Tecnologia Industrial, Lisbon (Portugal)]; Maeda, Hisaaki [ed.] [Univ. of Tokyo (Japan)]; Falzarano, J. [ed.] [Univ. of New Orleans, LA (United States)]; Schofield, P. [ed.] [W.S. Atkins, Surrey (United Kingdom)]; Morrison, D. [ed.] [Shell E and P Technology Co., Houston, TX (United States)]; PB: 484 p.
- Country of Publication:
- United States
- Language:
- English
Similar Records
Coupled Mooring Analyses for the WEC-Sim Wave Energy Converter Design Tool: Preprint
Comparison of simulated and measured motions of a turret moored vessel