散货船及油船垂向波浪载荷短期预报经验公式

Empirical formula for short-term forecast of bulk carriers and oil tanks' vertical wave loads

应用WALCS软件对6艘散货船及6艘油船进行了短期波浪载荷直接计算,依据计算结果分析了这两种船型在航速为0、迎浪、均匀满载及隔舱满载工况下的船舯垂向弯矩、L/4(L为船长)处垂向剪力、3L/4处垂向剪力的若干规律。根据这些规律,总结出了一套针对散货船及油船的垂向波浪载荷短期预报经验公式。依据此经验公式,在缺乏完备图纸资料的情况下,可以快速估计航行于海上的受损船舶的短期载荷情况,为评估其安全状态提供数值依据,为事故船东方做出安全可行的处理决策提供优质服务。

Direct calculations of the short-term wave induced loads are carried out for 6 bulk carriers and 6 oil tankers by WALCS software. The laws of the vertical mid-ship bending moment, the vertical shear fore at L/4（ L is ship length）and the vertical shear force at 3L/4 are analyzed for the two types of ships in the situations of 0 speed, head sea, uniform full loads and interval cabin full loads. According to these laws, a set of empirical formulas for short-term forecast of ships＇ vertical wave loads are given in this paper. By these empirical formulas, in the case of absence of complete information on drawing, they can quickly estimate wave load conditions of damaged ships on the sea and provide a numerical basis to assess their safety status for ship owners to make a strategic decision.