Study On Collision Simulation For GCY470 Shunting Locomotive

Subways are put into operation in many cities in our country,its operation safety has received considerable attention.Once subway vehicle collides,it will cause serious casualties and property losses due to the huge inertia of vehicle.The frequent collision accidents constantly remind people to study the crashworthiness of railway vehicles.Therefore,the crashworthiness of GCY470 subway shunting locomotive is analyzed by the finite element simulation method in this paper.Firstly,the finite element analysis model of locomotive collision is established according to the characteristics of vehicle body structure.Then ANSYS 19.0 software is used to simulate the frontal collisions with three different speeds.It also adopted to analyze the side collisions with four different positions and different speeds.The variation rules of vehicle body are concluded in the light of its deformations,collision interface force,acceleration and energy conversion during the collisions.The derailment behaviors of two locomotives are analyzed according to the wheel rising volume and wheelset lateral displacement.On the basis of the collision results,an additional energy absorption device is designed.The double-layer thin-walled tubes are selected as the basic energy absorption element for the devices.The analysis results show that:(1)In the frontal collision,the collision response of the locomotive increases with the enhance of collision speed.When the collision speed is 25km/h,the maximum deformation of cab is 231mm,the peak of collision interface force is 1754k N,and the maximum collision acceleration is 52084mm/s~2,respectively.The maximum deformation and collision acceleration of the vehicle body exceed the standard requirements,and the safety of driver is threatened.(2)When a side collision occurs between two locomotive cabs,the deformation mainly occurs at the side wall in the impacted locomotive cab.When the collision speed is 20km/h,the maximum deformation is 31mm.During the collision,two locomotives derail at 255ms and 360ms,respectively.The impacted locomotive derail firstly.(3)When a locomotive collides the middle part of another locomotive,the deformation caused by the collision mainly occurs at the middle side wall of the impacted locomotive.When the collision speed is 20km/h,the maximum deformation is 37mm.During the collision,the impacted locomotive did not derail,but it had a roll movement and the maximum rolling angle reached 5.7°.Another locomotive derails at the time of 275ms.(4)After installing the energy absorption device,the energy absorbed by the energy absorption device is up to the 76.3%of the total energy when the collision speed is 25km/h.At the same time,the peak of collision interface force and the maximum acceleration are reduced by 20.8%and 30.8%,respectively.After optimization,the crashworthiness of the locomotive meets the standard requirements.The crashworthiness of shunting locomotive is analyzed by the finite element numerical simulation method in this paper,it has certain theoretical reference for the crashworthiness design of locomotive in the future.