Damaged Ship Motions And Wave Loads Based On 3-D Hydrodynamic Theory

The accurate analysis and prediction of wave loads of damaged ship are important for the assessment of residual strength. The 3-D hydrodynamic theory has been well applied in predicting ship motions and wave loads of integrated ship for many years, and also the strip theory has been applied in the damaged ship. However, strip theory is based on two-dimensional potential flow theory, which neglects the actual three-dimensional effects of ships, and therefore has some deficiency in the precision of computation.This paper is mainly about the damaged ship motions and wave loads based on 3-D Hydrodynamic Theory. The main contents are as follows:1) The floating condition and stability of damaged ship in still water are researched in this paper.2) A method of auto-generating three-dimensional grid of the wet surface of ships is presented in. this paper by second development of the language of MSC.PATRAN.3) The motion equations of ships advancing at a constant speed in regular waves of both shallow water and deep water are established with a three-dimensional hydrodynamic theory being utilized. And then the six-freedom steady responses of ship motions are obtained. The pulsating press responses along ship surface and wave-induced section loads are also computed.4) The short-tern prediction of the extremal distribution of wave loads in different sea conditions is also given in this paper.