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A Study on Motion Responses of Classic Spar Platforms Subjected to Short Crested Waves

Kurian, V.J. and Ng , C.Y. and Liew, M. S. (2013) A Study on Motion Responses of Classic Spar Platforms Subjected to Short Crested Waves. In: IEEE Business, Engineering & Industrial Applications Colloqium (2013), 7-9 April 2013, Langkawi.

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Abstract

Abstract— The wind generated seastate in the real sea condition is well represented by the short crested waves or the multidirectional waves. The short crested waves are identified as the linear summation of the randomly generatedlong crested waves that propagate to different directions. In this paper, experimental and numerical studies on the dynamic responses of the classic spar platforms subjected toshort crested waves are presented. The experimental study was performed in the Offshore Laboratory of Universiti Teknologi PETRONAS. In the study, the classic spar model was restrained by four mooring lines and subjected to short crested waves. A MATLAB code was developed to analyze the dynamic responses of the classic spar. The classic spar was modeled as a rigid body with three degrees of freedom in surge, heave and pitch motions. In each time step of the analysis, the mass, damping and stiffness matrices were computed. Newmark Beta method was employed to solve the dynamic equations of motion. Response amplitude operators (RAO) were estimated and compared with the measurements. The results compared well. Index Terms -Short crested waves; Model tests, Wave basin, Response amplitude operator, Dynamic responses

Item Type:Conference or Workshop Item (Paper)
Subjects:T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TC Hydraulic engineering. Ocean engineering
Academic Subject One:Academic Department - Civil Engineering - Structures, materials and construction
Departments / MOR / COE:Mission Oriented Research > Deep Water Technology
ID Code:10115
Deposited By: Prof Dr Kurian V John
Deposited On:25 Oct 2013 01:56
Last Modified:25 Oct 2013 01:56

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