水下远场爆炸下船舶结构响应计算有限元建模方式影响分析

Ship Structural Response Analysis of Computational Modelling under Far-field Underwater Explosion

利用有限元软件ABAQUS,针对船舶结构和设备采用不同建模方式,建立4种水下远场爆炸载荷作用下全船结构冲击响应计算的有限元模型,对比分析船体结构局部与总体冲击响应。结果表明:船舶骨材结构与设备的建模方式对结构局部冲击响应如加速度、应力等影响很大,而对结构的总体响应如剖面弯矩等刚性安装设备采用质量点均摊的方式处理以减小建模的工作量。对于大型的弹性安装设备,需采用质量点和弹簧单元仔细建模。

Four different FE models of ship structure and equipments were established to analysis the structural response un -der far-field underwater explosion in ABAQUS .The local and the overall hull structural responses from the four models were com -pared.The results showed that in the case of far-field underwater explosion , the local hull structural responses , such as accelera-tion and stress , are greatly influenced by the modeling methods of stiffeners and equipment .For overall structural responses , such as section moments , stiffeners can be treated as distributed mass in the shell and rigid mounted equipment can be simplified as distributed mass element to reduce workload .The modeling method of flexible mounted equipment has influence on both local hull structure impulse response and overall hull impulse response , so they should be fine modeled using mass elements and con-nector elements .