| There are a lot of nonlinear systems in practice, so the research of nonlinear system is very important. The modeling and prediction of nonlinear system is one of its applications. According to the characteristics of historical data estimate the ship motion after some time. Adjust ship posture ahead to keep the ship balance, this is conducive to ship navigation and crew's habitability.The shorted prediction for and control The ship longitudinal movement of shipping is essential to safe catapulting and efficient navigate and curb of vessel. Because of action of ocean wave,wind and the other interactions, shipping has complex movement in six degrees. So, it is very difficult for us to predict and control the movement attitude of shipping in a very short period and it needs further study whether in theory or real project. The problem solved in this paper is the tenth five-year plan national defense scientific research fund subsidization topic, having practical value.This paper selected ship longitudinal motion as researching subject, and did research on modeling and prediction of ship motion.Firstly, based on the strip theory, the hydrodynamic mathematical model was given for ship longitudinal motion forced by random sea. It was analyzed that the system stability of motion model.Applying spectrum fitting, it was given that forming filter of sea disturbance, which modeled for the disturbing force and moment of random sea. Forming filter of sea disturbance being part of ship longitudinal motion system, it was given that the ship augmenting longitudinal motion, analyzed latent Periodicity of ship longitudinal motion.Because wave disturbance was typical stationary random process, it could be described by a series of periodic sequence term. It studied Smooth Periodogram Algorithm modeling and prediction to predict wave disturbance and put up forecast simulation research and the result make out Smooth Periodogram Algorithm modeling and prediction was feasible. |
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