Structural Analysis And Optimization Of A New Type EMU Fuel Tank

Water tank and oil tank are important components to ensure the safety and stability of the train.In the course of train operation,the movement of the liquid inside the train tank produces shock sloshing.The excessive impact sloshing of the liquid may lead to the failure of the fuel tank structure,thus affecting the reliability and safety of the fuel tank structure.Therefore,it is necessary to analyze the static strength and transient state of the fuel tank,optimize the EMU structure and carry out the lightweight design under the premise of satisfying the structural strength.In this thesis,the static strength,modal and transient analysis of the fuel tank of a new type of EMU is carried out,which is based on static strength theory,fluid-solid coupling theory and finite element theory.The Ansys Workbench optimization platform is used to optimize the size of the baffle in the tank,so as to achieve the goal of improving the structural strength and lightening the structure of the fuel tank.Firstly,the working principle of the fuel tank is analyzed,and the preprocess of the fuel tank structure is performed,and the simplified finite element model of the fuel tank is established.Based on the static strength theory,the static strength of the fuel tank structure is analyzed,the stress and displacement deformation of the fuel tank structure with different number of baffle plates are calculated,and the modal analysis of the fuel tank structure is carried out.The results show that the fuel tank structure meets the design requirements.Secondly,the transient analysis of the fuel tank structure is carried out based on fluid-solid coupling theory,and the transient analysis of the fuel tank structure with 30%,50%,70%,and 90%oil levels are carried out successively.According to the analysis results,the maximum stress of the fuel tank is obtained when 90%oil is carried.Finally,according to the analysis results of fuel tank structure with 90%oil level,the fuel tank with two different baffle layout are designed and compared.One of the baffle layout with smaller stress is selected,which is further optimized to reduce the quality of the fuel tank under the Ansys Workbench platform,where the baffle thicknesses of in the Y direction is optimized.The result shows that the fuel tank with designed baffle layout can reduce the structural stress and lightweight of the fuel tank.According to the analysis of optimization results,it can be seen that the structural strength of the optimized fuel tank meets the design requirements,the maximum stress of the transient analysis of the tank is reduced,and the overall mass of the tank is reduced by 11.4%,achieving the purpose of structural optimization.The research provides a reference for the design of fuel tank structure.