舱内气体爆炸载荷下CNG运输船货舱结构动态响应研究

摘要

压缩天然气(CNG)运输船是以高压气瓶的形式进行天然气运输的一种新型船舶,在长时间的运输过程中有可能会因各种不良因素引发气体爆炸,从而对船舶结构构成威胁.文章针对世界上第一艘CNG运输船,开展了在舱内气体爆炸载荷作用下的货舱结构动态响应研究.根据该船特点确定了风险源、爆源位置和泄露量,应用MSC.PATRAN/DY-TRAN软件进行了有限元仿真计算,分析比较了舱室中不同结构的应力、变形和吸能状况.得出了舱内气体爆炸载荷下最危险的工况,并对此工况提出了相应的结构加强方案.%Compressed natural gas (CNG) carriers are a new type of ship capable of natural gas trans-portation in the form of high-pressure cylinders, which may pose a threat to ship structures due to various adverse factors that lead to gas explosions during long periods of transportation. In this pa-per,the dynamic response of the cargo hold structure of the first CNG carrier in the world under the gas explosion load is studied. According to the characteristics of this ship, the risk source, source location and leakage amount are determined. The finite element simulation by MSC. PATRAN/DY-TRAN software is used to analyze the stress,deformation and energy absorption of different struc-tures in the cargo hold. The most dangerous condition of the gas explosion load in the hold is ob-tained,and the corresponding structural strengthening scheme is put forward.