Kurian, V.J. and Ng, C.Y. and Liew, M.S. (2013) Dynamic responses of truss spar due to wave actions. Research Journal of Applied Sciences, Engineering and Technology, 5 (3). pp. 812-818. ISSN 20407459
Full text not available from this repository.Abstract
Spar platforms have been used for drilling, production and storage of oil and gas in the offshore deepwater region. The structure is installed at the deepwater locations in the sea and is exposed to continuous action of wind, wave, current and other environmental forces. Wave force constitutes about 70 of the total environmental force and could be considered as the most significant force affecting the dynamic responses needed for the design of these structures. In this study, the dynamic responses of the truss spar due to wave actions including the wave force theories and wave propagation directions are investigated. Numerical simulations are developed to investigate the accuracy of the wave force theories i.e., Morison equation and Diffraction theory, for large structure such as truss spar. The investigation is further expanded to study responses of the truss spar due to variations directions of the wave propagated. The truss spar is modelled as a rigid body with three degrees of freedom restrained by mooring lines. In the simulation, the mass, damping and stiffness matrices are evaluated at every time step. The equations of motion are formulated for the platform dynamic equilibrium and solved by using Newmark Beta method. To compute the wave force for truss spar, which is large compared to the wave length, Diffraction theory was found to be more appropriate. The Morison equation was found applicable only at the high frequency range. Short crested waves resulted in smaller responses in all the motions than that for long crested waves. Hence, it would be appropriate to consider the short crested wave statistics for the optimum design. © Maxwell Scientific Organization, 2013.
Item Type: | Article |
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Additional Information: | cited By 5 |
Uncontrolled Keywords: | Deepwater drilling; Diffraction; Diffraction gratings; Dynamic response; Equations of motion; Offshore oil wells; Spar platforms; Stiffness matrix, Beta method; Crested waves; Deepwater locations; Deepwater regions; Diffraction theory; Environmental forces; High frequency; Large structures; Mooring line; Morison equation; Oil and gas; Optimum designs; Platform dynamics; Rigid body; Short-crested waves; Stiffness matrices; Three degrees of freedom; Time step; Truss spars; Wave actions; Wave force; Wave propagation direction, Trusses |
Depositing User: | Mr Ahmad Suhairi UTP |
Date Deposited: | 09 Nov 2023 15:52 |
Last Modified: | 09 Nov 2023 15:52 |
URI: | https://khub.utp.edu.my/scholars/id/eprint/4038 |