Research On Lightweight Structure Optimization Of Metro Bogie Frame

As an important part of the railway vehicle structure,the bogie mainly plays the role of supporting the car body,bearing and transmitting various loads between the car body and the wheel rail,ensuring the smooth running of the vehicle on straight and curved tracks,and determining the safety and comfort of the vehicle Sex.With the development of modernization,the requirements for the speed and energy consumption of rail trains have increased.As the main structure of the vehicle,bogies need to be optimized to reduce the weight of the bogies but at the same time ensure the bogies.Structural reliability,so the optimal design of the lightweight direction of the bogie is of great significance.This paper selects the B-type subway bogie frame as the object,analyzes the frame strength and mode,determines the structural optimization design space,and completes the research on the lightweight structure optimization of the frame under the premise of ensuring the structural reliability.The main research work is as follows:(1)Import the three-dimensional model of the bogie frame into the finite element software Hyper Mesh for finite element simulation modeling.According to the UIC615-4standard of the International Railway Union,the static strength analysis of the frame is carried out by selecting the working conditions to simulate the operation of the vehicle,and the modal analysis of the frame.The analysis shows that the bogie frame meets the strength requirements.(2)Use Opti Struct software to analyze the sensitivity of the bogie frame,calculate the stress sensitivity and displacement sensitivity of each part of the frame,and select the main structural part of the side beam as the design variable in the optimization.(3)Opti Struct software is used to optimize the size and topology of the steering structure.Displacement and stress are used as optimization constraints.Minimize the weight of the structure as the optimization goal to obtain the results of lightweight optimization of the structure.The size optimization is carried out through 7 iterations.The final optimized design reduced the weight of the structure by 11.6%,and the topology optimization finally reduced the weight of the structure by 4.7% after 10 iterations.Both optimized designs achieved the goal of lightening.(4)Re-establish a finite element model of the optimized bogie frame,select common working conditions for static strength check,and calculate low-order modes and fatigue strength of welded parts,and the static strength and modulus of the frame after size optimization and topology optimization Both the state frequency and fatigue strength meet the structural reliability requirements,and the optimization effect of the structure before and after optimization is compared.The size optimization design has a higher degree of lightness but has a partial impact on the structure strength,but the topology optimization design is completed and has little effect Strength and improve the low-order modal frequency of the structure,the structure stress distribution in the topology optimization method is more reasonable,and the material utilization rate is higher.Both optimization schemes achieve the purpose of lightweighting under the premise of ensuring structural reliability.The research in this paper provides a reference for the optimization of the lightweight structure of the bogie frame.