Dynamic Analysis of Offshore Spar Platforms

Defence Science Journal

A.K. Agarwal¹  A. K. Jain¹ 

[1]Indian Institute of Technology Delhi, New Delhi

关键词: Offshore floating structure;    Spar platforms;    Hydrodynamic forces;    Floating structures;    Rigid bodies;   

DOI  :  

学科分类：社会科学、人文和艺术（综合）

来源: Defence Scientific Information & Documentation Centre

【 摘 要 】

Offshore spar platform is a compliant offshore floating structure used for deep water applications for drilling, production, processing, storage and offloading of ocean deposits. The offshore spar platform is modelled as a rigid body with six degrees-of-freedom (DOFs), connected to the sea bed by multicomponent catenary cables which consist of a mooring line, a clump weight, and an anchor line attached to the fairlcads. The response-dependent stiffness matrix consists of three parts: (i) the restoring hydrostatic force, and the stiffness due to cables. (ii) nonlinear horizontal springs, and (iii) nonlinear vertical springs. A unidirectional regular wave model is used for computing the incident wave kinematics by Airy's wave theory and  hydrodynamic force by Morison's equation. The response analysis is performed in timc domain using the iterative incremental Newmark's method. Numerical studies have been conducted for sea state conditions with and without coupling of DOFs.

【 授权许可】

Unknown