Influence of current and seabed friction on mooring cable response: comparison between time-domain and frequency-domain analysis
Journal article, 1997

For a single mooring cable, the effect of current and seabed friction on mooring-cable tension and energy dissipation are studied in both the time domain and the frequency domain. In the time domain, all nonlinearities can be taken into account. In the frequency domain, the nonlinear drag forces can be linearized either by a direct integration method or by statistical linearization techniques; for sea-floor effects, a simple lumped stiffness model and the statistical linearization method based on friction-controlled slip are combined. Two example structures, one flexible riser and one deep water mooring, are analysed. The time-domain and frequency-domain results compare well. The findings of the effects of current and friction on mooring-cable responses are discussed, they show that the linearized frequency-domain solution can produce satisfactory results.

drag force

bottom friction

statistical linearization

cable dynamics

direct integration linearization

Author

Yungang Liu

Department of Hydraulics

Lars Bergdahl

Department of Hydraulics

Engineering Structures

0141-0296 (ISSN)

Vol. 19 11 945-953

Subject Categories

Civil Engineering

DOI

10.1016/S0141-0296(97)00176-4

More information

Created

10/8/2017