基于NAPA软件的渔业船舶完整稳性分析

为验证NAPA软件在渔业船舶应用上的可行性和采用船舶静力学原理计算完整稳性的精确性,根据南海海域49.5 m金枪鱼延绳钓船的特定作业工况,分别采用NAPA软件和表格进行计算。计算结果表明,两种计算方法的偏差在2%左右,能够满足工程应用的精度要求。对气象衡准计算,分别采用了渔业船舶规则和国际海事组织(IMO)规则,由于算法不同,其偏差较大。通过比较发现,渔业船舶规则对气象衡准的要求高于IMO规则的要求。在没有条件使用大型船舶计算软件,且船舶处于平浮状态时,采用船舶静力学原理的计算结果是精确的。采用了船舶静力学原理并建立了NAPA计算模型,通过实例计算表明,NAPA软件具有在渔业船舶应用上的可行性和采用船舶静力学原理计算完整稳性的精确性,该结论可为船舶设计人员选取不同计算方法时提供参考依据。

Analysis on the intact stability of the fishing vessel based on NAPA software

For the purpose of verifying the feasibility of NAPA software in fishing vessel and the accuracy of the stability calculation with the ship's hydrostatical theory , according to the special loading condition of the 49 .5 m tuna longliner ship , the NAPA software and the table calculation were used respectively . The calculation results showed that the deviation of the two methods was about 2%, which could satisfy the accuracy requirements of the engineering application .About the weather criterion calculation , the Fishing Vessel Statutory Inspection Rules and the International Maritime Organization ( IMO ) Codes were used respectively .Because of the method difference , the result deviation was a bit large .The comparison results indicated that the requirements of Fishing Vessel Statutory Inspection Rules to weather criterion was stricter than that of the IMO Codes .In the absence of using the large ship calculation software and the ship was untrimmed, the results using the ship's hydrostatical theory were reliable .As the large ship calculation software is used frequently by the designer , so the calculation principle of the NAPA software is necessary for analysis .The ship's hydrostatical theory was adopted and the NAPA calculation model was established . Through the real example calculation , the results showed the feasibility of NAPA software in fishing vessel and the accuracy of the stability calculation with the ship's hydrostatical theory .In addition , the results could provide reference foundation when the ship designer selects different calculation methods .