Twice Expansion Analysis Method in Time-Domain for Wave-body Interaction

摘要

Significant drift phenomenon of platform with mooring system is often observed in deep sea. It would be incorrect if the traditional perturbation expansion method was adopted to investigate the wave-body interaction directly. In order to solve the problem, a twice expansion method in time-domain is proposed here. The analysis method is applied for forced motion of truncated cylinder and couple motion of a Spar platform in bichromatic waves. The numerical results show the correctness of the theory and the necessity of the present method.