engleski

Static and dynamic analysis of marine riser

The analysis is concerned with static and dynamic behaviour of the explorational marine riser exposed to the sever environmental conditions. The most significant influence factors that can exert the loads on the riser structure are taken into account. The static analysis is based on a nonlinear mathematical model. The static equilibrium solution is used as an initial condition for the time domain dynamic analysis. Time domain analysis is based on a step-by-step numerical integration of the dynamic equilibrium equations. The wave load is given by the modified Morison equation. The frequency domain dynamic analysis is based on the linearised dynamic equilibrium equation at the static equilibrium position by application of stochastic linearisation of the hydrodynamic loading. Riser displacement, rotations, axial forces, bending moments, shear forces and natural modes and frequencies of free vibration are evaluated. Numerical procedure by the finite element method is utilized.

marine risers; hydroelasticity; sea current; sea waves; finite element method

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