Design And Research On Bogie Frame Of GCY300-YG Urban Rail Transit Engineering Vehicle

Bogie frame is the key component of the running part of urban rail transit vehicles,and also the framework for installing wheelset,axle box,shock absorber spring,gear box,foundation brake,center pin or center disc and side bearing.Existing engineering vehicle bogies use axle box lateral suspension to increase the frame width,which leads to the increase of wheel set and frame quality,and it is difficult to pass small radius curve track.At the same time,it also causes the shortcomings of large wheel-rail action force and poor operation performance.Aiming at the above problems,this paper takes the bogie frame of GCY300-YG urban rail transit engineering vehicle as the research object,designs an inner axle box suspension bogie frame to improve the running quality of the vehicle,carries out static strength,modal simulation analysis and optimization design of the bogie frame of the engineering vehicle by using finite element method,and mainly studies the following aspects:(1)Using the modular design method of the bogie,a steering frame with inner axle box suspension is designed.The geometric model of the bogie’s overall structure and frame is established by using the three-dimensional modeling software Solidworks.The design parameters of the bogie and the composition and function of each module are described.(2)According to the mechanical analysis of the bogie,four load conditions are determined.In order to meet the strength requirements of the bogie,the finite element method is used to carry out the static analysis of the bogie under the relevant load conditions.The results show that the maximum equivalent stress under each working condition is less than the allowable stress of the material,and the structural strength of the frame meets the design requirements.(3)In order to avoid resonance between vehicle and frame,the modal analysis of bogie frame is carried out,and the 12-order natural frequencies and corresponding modes of the frame under constraints are obtained.The excitation frequencies of urban rail lines are 1-3 Hz.The results show that the natural frequencies of the restrained modes of the frame are larger than the excitation frequencies of the urban rail lines,and there is no resonance phenomenon.All the modes meet the requirements of the rigidity of the frame.(4)In order to obtain better dynamic performance,lightweight design of the bogie frame is carried out.The optimal design object is the curve condition with the maximum equivalent stress from the four load conditions.The strength and modal validation of the optimized bogie frame model are carried out.The optimization results show that the quality of the frame is reduced by 4.3% on the original basis;the maximum equivalent stress of each working condition after optimization is less than the allowable stress of the material,which meets the strength requirements;the lowest natural frequency of the frame increases,and the vehicle running frequency is far away from the natural frequency of the frame,which will not produce resonance and meet the stiffness requirements.