| As the running part of rail vehicle,bogie is one of the core components of rail vehicle.It carries various components on rail vehicle.The structural performance of bogie frame directly affects the stability,safety and riding comfort of the vehicle during operation.As the installation base of other components,the quality,modal characteristics and fatigue characteristics of the frame are mutually restricted.In this paper,CRH3 type power bogie frame as the research object,according to the relevant calculation standards of bogie frame,static strength and fatigue strength analysis,and based on Abaqus-Isight co-simulation method,the quality of the bogie frame and the first four modes of frequency optimization design research.This paper mainly does the following research work:(1)The finite element model of the CRH3 bogie frame was established with Hypermesh software.The finite element discretization of the frame was carried out in the form of combination of shell element and solid element,and the element quality analysis was carried out to ensure the accuracy of the calculation.(2)Abaqus software is used to establish the coupling constraints and boundary conditions of the finite element model.Based on UIC615-4,EN13749,JISE4207 and JISE4208 standards,various loads of the bogie frame are calculated,and the load condition table is established.According to the load and working conditions under each standard,the static strength and fatigue strength of the bogie frame are calculated,and the similarities and differences between the three standards are compared and analyzed.(3)The first four free modes of the bogie frame were calculated by using Abaqus software,and the natural frequency and vibration mode of the frame were calculated and analyzed.The overall performance of the finite element model is evaluated.Among them,the first-order modal frequency of the frame is 36.322 Hz,and the mode shape is the torsion deformation of the side beam.(4)With the wall thick Ness of the bogie frame beam,the thick Ness of the upper cover plate of the side beam,the thick Ness of the inner plate of the side beam,the thick Ness of the outer plate of the side beam and the thick Ness of the lower cover plate of the side beam as the design variables,the optimization design model of the bogie frame was established by using Isight and Abaqus software,and the sensitivity of the first four modal frequencies and the MASS of the frame to each design variable was calculated and analyzed.The sensitivity of each modal frequency and MASS to each design variable was obtained through 1024 simulation cycles using the full factor test method.The results of sensitivity calculation show that the design variable with the greatest influence on the first mode frequency is the thick Ness of the beam tube wall,which is up to 58.07%,which provides a theoretical basis for size optimization(5)According to the full factor test method and the results of sensitivity calculation,the response surface was constructed,and the error analysis of the approximate response surface was carried out with the R-squared value.An optimization mathematical model is established in Isight,and NLPQLP method is used to achieve the optimal design of the architecture.Multiple Pareto solution sets are obtained,and one of the non-dominant solutions is selected as the optimal solution.The results show that after optimization,the first order free mode frequency increases by 4.016 Hz,the increase proportion reaches 11.1%,the other orders free mode frequency also increases,but the frame MASS decreases by 26.7kg,and the optimized structural strength meets the UIC615-4 standard. |
