Nonlinear coupled dynamic response of offshore Spar platforms under regular sea waves |
| |
| Authors: | A K Agarwal A K Jain |
| |
| Institution: | Department of Civil Engineering, Indian Institute of Technology, Hauz Khas, New Delhi-110016, India |
| |
| Abstract: | Many innovative floating offshore structures have been proposed for cost effectiveness of oil and gas exploration and production in water depths exceeding one thousand meters in recent years. One such type of platform is the offshore floating Spar platform. The Spar platform is modelled as a rigid body with six degrees-of-freedom, connected to the sea floor by multi-component catenary mooring lines, which are attached to the Spar platform at the fairleads. The response dependent stiffness matrix consists of two 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 springs. A 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 the moored Spar platform as an integrated system using the iterative incremental Newmark’s Beta approach. Numerical studies are conducted for sea state conditions with and without coupling of degrees-of-freedom. |
| |
| Keywords: | Wave structure interaction Offshore structural dynamics Spar platform Multi-component catenary mooring |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
