Structural Optimization Design For Tank Carried By EMU Based On Fluid-Solid Interaction

Underslung water tank carried by EMU is a necessary part and it can provide drinking water and domestic water for passengers. So it’s very important to insure its safety and reasonable structure. With speed of train increasing highly, the problem of water shaking becomes more prominent.In order to reduce the weight of the tank and distribute the tank stress reasonably, the baffle aperture and the tank thickness are optimized, which is more and more important. In this paper, based on the700L underslung water tank carried by CRH2EMU, the tank under the accelerating work condition is researched with the One-way fluid structure interaction method. The process and method of the structure optimization design are explorered.The main works been finished are as below:1.Establishing the parametric geometry model of water tank. Using the Solidworks software to complete the tank structure and fluid model. the geometry model is quickly established by modifying the parameters in the model.2. Establishing the parametric grid model. Using the meshing tool Hypermesh and ICEM to parameterized the fluid-structure analysis model.we can complete to calculate the modified fluid grid and generate a certain quality of the fluid-structure finite element model quickly.3. Static simulation data and experimental data is basicly consistent. Compare the Static simulation data and experimental data show that the fluid-structure analysis model is reasonable.4. Lateral impact stress is greater than the allowable stress. The results showed that:the positive impact of the maximum stress has exceeded the allowable stress range, which is located at the left side of plate and angle steel connections. Observeing the liquid pressure distribution diagram and the three baffle stress distribution map shows that:the baffle could reduce the impact loading of the liquid on the tank walls and baffle,and baffle stress and deformation distribution law with the pore diameter size.3. Establishing the optimization design process with iSIGHT,we could get reasonable diameter and plate thickness,which make the stress of the tank lower and the overall weight of the tank fell about8.2%.By the study in this paper, the tank structure design ideas and analysis methods is provided for a reference.