Dual-scale topology optimization design of high speed train obstacle deflector structure coupling obstacle removal and energy absorption
The obstacle deflector is placed at the front end of the train and is used to clear obstacles on the track before the train body impacts them.The design requirements for the obstacle deflector structure differ in terms of stiffness and energy absorption characteristics when the train speed or obstacle size changes.To design a structure coupling obstacle removal and energy absorption,a dual-scale optimization design method that combined high overall stiffness(obstacle removal)with local structural reduction of impact force(peak shaving and energy absorption)was proposed.In the preliminary design of the overall structure,the deformation interval was determined with stiffness as the target,and then,in the serial route,the local structural optimization was conducted to guide the structural deformation,resulting in a new type of obstacle deflector.The results show that under the static load conditions according to standard EN 15227,the mass of the new obstacle deflector structure is reduced by 7%and obstacle deflection safety is improved.In the simulation of impact on a rigid wall,the peak force of the new obstacle deflector is reduced by 17.5%compared to that of the original obstacle deflector.Additionally,the optimized buffer beam structure transforms the bending deformation in the middle of the obstacle deflector into compressive deformation,effectively alleviating the squeeze of the obstacle deflector against the rear of the train body.
high speed trainobstacle deflectorequivalent static loads methodtopology optimization
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