Strength Analysis And Optimization Of Bogie Frame For Heavy Railcar

Heavy railcar is a professional vehicle engaged in railway line maintenance and rescue.With the continuous increase of railway mileage in China,the performance requirements of engineering vehicles are constantly improving.Under the background of energy saving and emission reduction,how to reduce vehicle weight has become increasingly important.Bogie is an important part of a vehicle.Its performance directly affects the performance of the vehicle.At the same time,reducing the weight of the bogie is helpful to control the weight of the vehicle and reduce energy consumption.The research object of this paper is the bogie frame of heavy railcar.The static strength,fatigue strength and modal of the frame are analyzed based on the finite element theory.And the structural optimization design of the frame is carried out,which is based on the analysis results.The specific work is as follows:(1)Reference to the frame design and test data of engineering vehicles,TB/T 2368-2005 is selected as the frame strength analysis standard.According to the standard,the load type is determined and the load size is calculated.The working condition combination of strength analysis is established.(2)According to the established working condition combination,the strength of the frame is calculated by using finite element analysis software HyperMesh and ANSYS.The fourth strength theory is used to evaluate the static strength of the frame,and the Goodman-Smith fatigue curve is used to evaluate the fatigue strength of the frame.It is found that the static strength and fatigue strength of the frame conform to the standard,but the stress in some parts of the frame is too high,which needs further optimization.(3)The first 10 natural frequencies and the first 6 modal modes of the frame are calculated by using the finite element software.The results show that the lowest natural frequency of the frame can effectively avoid the car body resonance,and the modal vibration mode is conducive to driving safety.(4)On the basis of the previous analysis,structural improvements and lightweight design of the frame are carried out.The structural stress of the frame is obviously reduced and the weight is reduced by 6.86%.Through verification,it shows that the strength of the optimized frame meets the requirements and the optimization design is reasonable.Through the structural strength analysis of the bogie frame of this type of railway engineering vehicle,the basis for the design,production and test of the frame is provided,which is helpful to avoid structural defects.The structure improvement and lightweight design of the frame provide ideas for improving the performance of the frame in the next step.