Dynamic response of snow-removal process at the front end of EMU and resistance formation mechanism
To analyze the relationship between the snow characteristic and snow-removal resistance and design the obstacle deflector with high-efficiency snow-removal capacity,the dynamic response of the obstacle deflector and the law of snow movement under the impact loading were analyzed by using the SPH(smooth particle hydrodynamic)simulation method and the elastoplastic constitutive defined by the Drucker-Prager failure criterion.The influence of snow depth,characteristics,and the operating boundary on snow-removal resistance was studied.A snow-removal resistance mapping model based on mass conservation and the D'Alembert principle was constructed to reveal the formation mechanism of snow-removal resistance.The results show that the obstacle deflector with the snow-removal resistance is in the elastic response and presents no plastic failure.When the snow depth is 10-410 mm,the snow density is 160-480 kg/m3 and the speed is 80-160 km/h,snow-removal resistance is linearly positively correlated with snow depth and density,and is quadratic positive correlated with snow discharge speed.The theoretical model of snow-removal resistance can accurately predict the numerical calculation results.Compared with the friction resistance and cutting resistance,the change of snow motion state after electric motor units(EMU)impact is the main reason for the formation of snow-removal resistance.
electric motor unitsobstacle deflectorsnow-removal resistancedynamic response
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