Numerical research on dynamic response of naval equipments subjected to impact loads

When subjected to underwater explosion,the anti-shock performance of naval equipment is a key factor affecting the fighting capacity and safety of a war ship. For large-scale naval equipment,it is costly to do the shock test for its huge mass and large size. Consequently,the numerical research was carried our to study the shock resistance of the equipment. Taking turbo-charger set for example,its anti-shock performance was studied using software ABAQUS based on the time-domain shock analysis method presented in BV043 /85. According to the analysis results,shock response of typical regions is obtained,some regularity curves are concluded by analyzing the Mises stress of the typical regions,and the weak regions are found out. The study can provide some references on design of turbo-charger set.     

基于ABAQUS平台对球冠结构焊接变形的数值试验

球冠结构在焊接过程中产生的焊接变形是关系到结构安全性能的重要指标.为了保证球冠焊接构件的可靠性,准确推断球冠结构焊接变形,有必要针对球冠结构的焊接变形进行数值试验分析.基于大型有限元软件ABAQUS开发相应的焊接程序,对焊接过程中温度场、结构变形进行了数值模拟,并将模拟结果与相关理论值及试验值进行对比分析.结果表明,数值试验结果与理论结果基本吻合,满足工程要求.在此基础上,对球冠结构的焊接过程进行三维有限元分析,得到了球冠结构焊接变形随球冠壁厚、焊接坡口形式及焊接顺序的变化规律,为控制结构的焊接变形提供了依据.