Modeling and Simulation of a Tension Leg Platform

In this paper, we present a non-linear 6 degree-of-freedom dynamics model for a tension leg platform type structure. The dynamics model and simulation presented here is different from other models in its derivation approach. Existing models are usually based on deriving stiffness coefficients from an analysis of single-degree-of-freedom perturbations of the platfonn. By contrast, we analyze the generalized platform motion, based on fundamental kinematic principles, and calculate the forces and moments resulting from this motion. Also included in this analysis are the effects of random wave forces and a method to calculate the buoyant righting moment.