基于STL模型的散货船破损浮态计算

Ship Damage Floatation Calculation Based on STL Model

为计算散货船破损浮态,基于船舶外壳及所有舱室的STL模型探讨了一种浮态迭代算法。根据STL模型建立船舶三维数据库。采用"重量增加法"和"迭代法"计算船舶破损浮态。以散货船"DOLCE VITA"为例,计算了"压载进港"和"满载出港"载况下的5个货舱单舱破损情况,和船舶设计软件NAPA计算值相比,吃水差平均误差为0.013 6 m,横倾角平均误差为0.052°,进水量平均相对误差为0.28%,验证了算法的准确性。实验结果表明:STL模型来源于船舶设计数据,计算精度较高,应用前景较好;浮态迭代算法既可保证程序迭代次数,又能避免水线面要素求解,具有一定的工程应用价值。

In order to calculate the damaged floating state of bulk carrier, an iterative algorithm was discussed based on STL model of the ship shell and all the compartments. According to the STL model, the 3D database of ship was established, ＂weight Added method＂ and ＂iterative method＂ were used to calculate the floating state of the damage ship. Bulk carrier ＂DOLCE VITA＂ was taken as an example, ＂The normal ballast condition at arrival＂ and ＂Fully loaded with homogeneous cargo at departure＂ loading conditions were calculated, compared with calculated value of ship design software NAPA, the average error of trim is 0.012 3 m, the average error of heeling angle is 0.052° , and the average relative error of inflooded water is 0.28%. The accuracy of the algorithm was verified. Experimental results show that： STL model is derived from the ship design data, has high calculation accuracy, and has good application prospect. Floating state iteration algorithm, which can guarantee program iterations and avoid calculating the elements of water plane, has certain engineering application value.