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Please use this identifier to cite or link to this item: http://eprint.iitd.ac.in/handle/2074/1138

Title: Nonlinear coupled dynamic response of offshore Spar platforms under regular sea waves
Authors: Agarwal, A K
Jain, A K
Keywords: Wave structure interaction
Offshore structural dynamics
Spar platform
Multicomponent catenary mooring with horizontal and vertical spring
Issue Date: 2003
Citation: Ocean Engineering, 30(4), 517-551
Abstract: Oil and gas exploration of large reservoirs in deep water has accelerated the need to explore structures suitable for these depths, which operate more economically in deep water. A Spar platform is one such compliant offshore floating structure used for deep water applications for the drilling, production, processing, storage and offloading of ocean deposits. The Spar is modeled as a rigid body with 6 degrees-of-freedom, connected to the sea floor by multi-component catenary mooring lines, which are attached to the Spar at the fairleads. The response-dependent stiffness matrix consists of three parts: (a) the hydrostatics provide restoring force in heave, roll and pitch; (b) the mooring lines provide the restoring force which are represented here by nonlinear horizontal; and (c) vertical springs. An unidirectional regular wave model is used for computing the incident wave kinematics by Airy’s wave theory and force by Morison’s equation. The response analysis is performed in time domain to solve the dynamic behavior of a moored Spar platform as an integrated system using the iterative incremental Newmark’s Beta approach. Numerical studies are conducted for several regular waves.
URI: http://eprint.iitd.ac.in/dspace/handle/2074/1138
Appears in Collections:Civil Engineering

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