ABSTRACT

The purpose of the study is to include a spatial statistical correlation between sea states that ship encounters during a voyage to improve wave scatter diagram for the analysis of ship structures. The methodology consists of computation of system reliability of a series of partially correlated events, representing sea states that ship encounters along the sailing route. The North Atlantic wave scatter diagram is modified to account for such spatial correlation and new scatter diagrams for partially correlated sea states are constructed. Based on such “correlated scatter diagrams”, long-term distribution of vertical wave bending moments is performed and compared to the results following from an “uncorrelated scatter diagram”. It was found that a spatial correlation may considerably reduce extreme vertical wave bending moments. Verification of the methodology is performed by simulating shipping route in the North Atlantic using ERA5 wave database.

摘要

该研究的目的是包括船舶在航行期间遇到的海况之间的空间统计相关性，以改进用于分析船舶结构的波浪散布图。该方法包括计算一系列部分相关事件的系统可靠性，代表船舶沿航行路线遇到的海况。修改了北大西洋波浪散布图以说明这种空间相关性，并构建了部分相关海况的新散布图。基于这种“相关散点图”，执行垂直波浪弯矩的长期分布，并与“不相关散点图”的结果进行比较。发现空间相关性可以显着减少极端垂直波浪弯矩。