Structural Optimization For Tank Of200L Based On Two-way Fluid-solid Interaction

Underslung water tank carried by EMU is an essential part and it can guarantee the supply of drinking water and domestic water for passengers. Therefore, it’s extremely necessary and significant to insure the safety and reasonable structure of water tank. With the highly increase speed of EMU, the problem of liquid sloshing becomes more prominent during the acceleration, deceleration and braking of the train. In order to reduce the weight of the tank and distribute the tank stress reasonably, it’s more and more necessary to optimize the structure of the baffle aperture and the tank thickness. In this paper, take the200L water tank carried by the electric multiple units as the research object and study the tank under the static and accelerating work condition based on the Two-way FSI method. And complete the optimization of water tank by using the optimization software. The main works have been finished as below:(1) Establish the geometric model. Use the SolidWorks to build the tank structure and3d model of the fluid.(2) Establish the finite element model. Use the Hypermesh and ICEM CFD software to mesh the structure of solid and fluid respectively.(3) Set the solid boundary. Set constraint conditions, analysis type and boundary conditions of the solid domain, and the two-way coupling of fluid-solid interaction in Hypermesh and ANSYS.(4) The deformation of the grid. Set the control field of solid and fluid grid respectively in the Sculptor, and control the deformation of solid and fluid mesh by using control points. And realize the automatically deformation of grid by writing files.(5) Set the fluid boundary and two-way fluid-solid interaction. Set the fluid boundary conditions and two-way fluid-solid interaction platform in CFX software.(6) Analysis the static strength of water tank By using ANSYS, and analysis the water tank under the impact load condition based on two-way fluid-solid coupling by using CFX and ANSYS.(7) Analysis the optimization of the water tank structure. According to the design variables, constraints, objective functions and the multi-objective optimization algorithm, finish the optimization of water tank based on two-way fluid-solid interaction. And then the optimal solution and the optimal design parameters are obtained. The optimization reduces11.2%weight of water during the permission of the allowable stress.