【摘要】 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。更多还原

【Abstract】 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 introduced. This paper will be lay the foundation for modeling sea wave and predicting ship oscillation.更多还原