Structural Optimization Design And Strength Analysis Of The New Type Suspended Monorail Vehicle Bogie Frame

Suspended monorail system has the characteristics of low cost,short construction period,flexible grouping and strong adaptability,the system can effectively alleviate the traffic congestion problem in the city,in recent years,more and more people pay attention to the system.In this context,this paper designs a new type suspended monorail vehicle bogie,then does structural optimization design and strength analysis on the bogie frame.This paper first introduces the characteristics and development status of suspended monorail system,analyzes the domestic and foreign research status of suspended monorail vehicle bogie frame,summarizes the existing research results,combined with the actual situation in our country,and references Japan Chiba and Germany Dortmund suspended monorail vehicle bogie technology,the main technical parameters of the vehicle are determined.Analyzing bogie structure characteristics and load transfer process,getting a new type suspended monorail vehicle bogie frame structure program,using CATIA software build the bogie’s 3D modeling,extracting frame structure to calculate the strength analysis,The structure of the frame model is imported into HyperMesh converting as discrete finite element model.Calculating the static strength for the bogie frame based on BS EN 13749:2011 standard and UIC 615-4:1993 standard,calculating 16 kinds of abnormal static load and 49 kinds of normal static load,doing the optimization design for the new type suspended monorail vehicle bogie frame by OptiStruct software in abnormal static load conditions,selecting the plate thickness as design variables.To achieve the purpose of weight reduction,calculating the static strength and modal analysis for the optimized frame.Finally calculating the fatigue strength analysis,according to the standard transforming multi axial stress into uniaxial stress,assess the fatigue strength of bogie frame using the modified Goodman curve.The results of this paper are as follows:1.The new type suspended monorail vehicle bogie with permanent magnet motor has more simple and compact structure,lower weight,higher efficiency,adding a suspension device can effectively improve the performance of the vehicle,the bogie meet the actual demand.2.The maximum stress does not exceed the material yield limit is constraint condition;the thickness of the steel plate structure is design variables,doing size optimization for the bogie frame.The frame quality decreased by 13.3%,improve the economic efficiency of frame manufacturing.3.Calculating the static strength for the optimized bogie frame,the calculation results shows that in the abnormal static loads and the normal static loads the maximum stress of the frame are less than the material allowable stress,the static strength of the frame meet the requirements.4.Calculating the fatigue strength for the optimized bogie frame,and the sampling points of the frame are all in the envelope of the material Goodman curve,to meet the design requirements of fatigue strength.