基于双向流固耦合的动车组水箱强度分析

Strength analysis of EMU tank based on two-way fluid-solid interaction

以高速动车组车下水箱为研究对象,采用双向流固耦合方法,对车载水箱箱体内液体冲击晃动问题进行了建模与数值分析.通过研究列车变速过程中水箱内气液两相分布状态,获得了采用单向耦合方法不能获得的水箱结构应力随时间的变化历程,实现了对水箱结构强度更为准确的分析.研究结果表明:箱体所受最大应力基本与充液比成正比,且最大应力位置基本相同;当充液比为0.9左右时,其应力值达到最大.通过单、双向耦合结果与试验数据对比分析表明,双向耦合方法比单向耦合方法更为准确可靠.本文为高速动车组水箱结构的设计提供了实用可靠的分析方法.

Taking the tank under high-speed EMU as the research object,a numerical simulation and modeling for the liquid sloshing in the process of speed changing was performed with the two-way fluid structure interaction method.The gas-liquid two-phase distribution and the time history of the water tank stress were obtained in the process of speed changing.Accurate analysis of the water tank structure strength was realized by determining the stress distribution of the tank.The results show that the max stress of the tank wall increases with the filling ratio and the positions of the max stress are basically the same.When the filling ratio is 0.9,the stress exerted on the whole tank has the maximum value.And it can also provide practical and reliable analysis for the design of tank structure under a high-speed EMU.