摘要
本文研究了非线性海洋波的统计预报问题。在窄带假定下,得到三阶非线性波峰谷概率密度函数,探讨了不同Stokes波模型的影响。导出了一个简捷的三阶非线性最大1/n峰值平均统计值的解析表达式。发现非线性波最大1/n平均不但依赖于一阶波幅的均方差,而且还依赖于一阶有义波倾系数。 文中提供了与线性波结果比较的算例,并与模拟统计样本作了比较,结果表明本文提供的方法具有一定的工程准确性。
A statistical prediction of nonlinear irregular waves is presented. Based on the narrow-band assumption, the probability density function of peak and trough distribution up to third-order approximation is obtained. Furthermore, the effects of different Stokes wave models on this function are also discussed.Using third-order nonlinear wave model, a simple analytical expression of highest l/n wave amplitude is derived. It is found that the highest l/n wave amplitude depends on not only the root-mean-square of first-order wave amplitude, but also the coeffcient of first-order significant slope.A numerical result is presented and compared with both the linear theory and the simulated statistical sample. It shows that the model presented by the authors is of satisfaction for engineering use.
出处
《中国造船》
EI
CSCD
北大核心
1990年第1期7-14,共8页
Shipbuilding of China
