海浪非线性行为的参数化表征

Parametric indication of sea wave's nonlinearity behaviours

针对实际海浪具有多方面非线性效应的特点,文章综合提出了描述非线性海浪特征的几种指标,包括频谱/方向谱、二阶谱和高阶谱、波高分布形式(偏度)、波面信息熵、局域小波能谱、Hilbert时频谱、主分量谱图、最大Lyapunov指数等,并对各种指标的概念及计算作了简单介绍,为实际海浪模拟及实船摇荡运动预报打基础。

Aiming at nonlinear effects of sea wave, several kinds of indices were proposed to describe sea wave＇s nonlinear characteristics, including wave spectrum/directional wave spectrum, bispectra and high order spectrum, wave height distribution style （deviation）, information entropy of wave surface, wavelet energy spectrum, Hilbert time-frequency spectrum, primary component analysis spectrum, the largest Lyapunov exponent, and so on. Both of concepts and calculation methods of each index were briefly intro- duced. This paper will be lay the foundation for modeling sea wave and predicting ship oscillation.