3种非线性波浪载荷计算方法介绍及其实船应用比较

Introduction of 3 Nonlinear Wave Load Calculation Methods and Results Comparison on Real Project

介绍3种预报非线性波浪载荷的时域方法,分别是规则波法、等效韦布尔法和极大波法。以第二代40万吨超大型矿砂船为例,分别使用此3种方法对中垂和中拱波浪弯矩做了预报,得到3种方法下的不同波浪弯矩值,并比较3种方法的优缺点。此3种方法,在实际工程中都可被船级社接受使用,但从目标船的计算结果看,最终的弯矩值有10%左右的差距。所以非线性波浪弯矩的计算结果,会根据计算方法的不同而有所不同,实际工程项目中可以根据需要合理选择计算方法。

3 time domain methods used for nonlinear wave load forecast are introduced.They are regular design wave method,equivalent Weibull probability method(EWP)and most likely extreme response method(MLER).Sagging and hogging vertical wave bending moments of the second generation 400000 DWT-VLOC are predicted by those 3 methods separately,the bending moments are obtained and the advantages and disadvantages of the 3 methods are compared.All of these 3 methods can be accepted and put in use in real projects by classification society.But in terms of the calculation results of 400000 DWT-VLOC,it can be found that there are 10%difference between these 3 methods.And this means that different calculation methods can lead to different calculation results of the wave bending moment.So in real projects,it is better to choose suitable calculation method according to needs.