Vibration Fatigue Analysis Of GCY470 Shunting Locomotives

Due to its wide application,subway shunting locomotives often work in a complex random vibration environment,and there is vibration fatigue damage at the various structures of the car body.The occurrence of this phenomenon can easily lead to serious operation accidents and cause a lot of economic and property losses.Therefore,based on the finite element fluidstructure coupling method,the modal analysis method and the frequency domain analysis method,this paper analyzes the five operating conditions(vertical load condition,longitudinal compression condition,longitudinal stretching condition,one-end lifting condition,vehicle lifting condition)of the GCY470 subway shunting locomotive in the conventional open-air environment,subway tunnel and snowstorm.First,vibration fatigue calculation is performed on the shunting locomotive body in a conventional open air environment: three-dimensional model of the subway shunting locomotive is established in Creo 3.0 software;the static strength analysis and modal analysis are performed in ANSYS 19.1 software as a front module for vibration fatigue and check the locomotive body according to the GB/T7928 standard;the sweep frequency analysis is performed to obtain the frequency response function of the locomotive body;according to the S-N curve of the material after the mean stress correction,the power spectral density Based on the standard and finite element results,the vibration fatigue analysis of the shunting locomotive body under conventional open-air working conditions is carried out using n Code software.Secondly,vibration fatigue calculation is performed on the shunting locomotive body in the subway tunnel: the subway tunnel shunting locomotive is established in CREO 3.0 software;the fluid-solid coupling analysis of the locomotive body is performed in Fluent module in ANSYS 19.1 software;modal analysis and harmonic response analysis are also performed on the results of fluid-solid coupling analysis,and vibration fatigue analysis of shunting locomotives in subway tunnels is performed through n Code software.Finally,vibration fatigue analysis is performed on the shunting locomotive body in snowstorm environment: fluid-solid coupling analysis of the locomotive is performed in Fluent module in ANSYS 19.1 in use of discrete phase model to simulate the impact of snowstorms on the body and the vibration fatigue analysis of the shunting locomotive is performed under the snowstorm environment in the same way.The results show that the maximum static pressure on the front of the shunting locomotive body in a snowstorm environment is 10000 Pa,and the maximum static pressure on the front side of the subway tunnel is 2020Pa;the vibration fatigue damage of the locomotive body in a snowstorm environment is greater than the other two operating environments;Under the five operating conditions of the locomotive,the vibration fatigue damage is the most serious under the lifting condition of the whole vehicle.The locomotive body does not reach the vibration fatigue limitation,but the maximum vibration fatigue damage is close to the critical value;the structure of the locomotive body with the vibration fatigue damage is mainly the side wall of the locomotive body,the top skin of the side wall,the channel steel,the doors and windows of the driver’s cab,coupler plate under longitudinal tension working condition and longitudinal compression working condition,one-end lifting hole and underframe bottom plate under oneend lifting working condition and vehicle lifting working condition.When driving in a snowstorm environment and in a subway tunnel,the vibration fatigue damage of the bottom locomotive does not change significantly.The research results of this article provide a certain reference basis for the vibration fatigue research of shunting locomotives and a certain theoretical basis for the design and research of shunting locomotives.