A coupled analysis of motion and structural responses for an offshore spar platform in irregular waves

A coupled numerical analysis has been carried out for the structural responses and motion behaviour of a classical spar structure subjected to irregular waves represented by JONSWAP (Joint North Sea Wave Project) spectrum. The motion of the floating body is restrained by the four catenary mooring li...

Full description

Saved in:
Bibliographic Details
Published in:Ships and offshore structures 2017-03, Vol.12 (sup1), p.S296-S304
Main Authors: Roy, S., Ghosh, V., Dey, S., Vimmadi, S., Banik, A.K.
Format: Article
Language:English
Subjects:
coupled dynamic analysis
directional spreading
mooring cable
Numerical analysis
Ocean engineering
Offshore
sensitivity study
Spar structure
time domain analysis
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:A coupled numerical analysis has been carried out for the structural responses and motion behaviour of a classical spar structure subjected to irregular waves represented by JONSWAP (Joint North Sea Wave Project) spectrum. The motion of the floating body is restrained by the four catenary mooring lines with the generation of tension due to change in their nonlinear profile. The surface of the spar is represented by hydrodynamic pressure panels while cables are discretised using a series of Morison elements. A comprehensive sensitivity analysis under two sea depths is carried out by changing (1) the length of mooring lines, (2) the vertical position of fairlead point, (3) incident angle of long crested unidirectional single spectrum, and (4) the number of short crested sub segmented spreading spectra. The effect of second-order hydrodynamic loading on the structure is also taken into account in the analysis procedure by using quadratic transfer function.
ISSN:1744-5302
1754-212X
DOI:10.1080/17445302.2016.1256183