Three Dimensional Analysis Of A Marine Riser With Large Displacements

A formulation to analyse the large displacement problem of a marine riser with two unequal principal moments of inertia of cross sections in three dimensional space is presented. The method involves the utilisation of the equilibrium equations in the axial direction and the stationary condition of an energy functional. The stationary condition of an energy functional. The co-ordinates X and Y, twisting angle F, and tension T are the four dependent variables, while the arc length s in the equilibrium state is the independent variable which is changed to depth Z in the numerical implementation. A finite element method was developed to solve the problem of a riser with equal principal cross sectional moments of inertia. An example is given.