Structure Strength And Reliability Analysis Of CRH380B Bogie Frame

Bogie is one of the key components of railway vehicles,which is the main receiving component of rail excitation in the operation process of the vehicle.The frame is the base of the other parts of the bogie,and transfers alternating loads from all directions.Whether the frame design is reasonable or not directly affects the safety,stability and reliability of train operation.With the increase of the EMU speed,the fatigue damage of the frame increases significantly,causing serious economic losses and threatening the safety of driving.Taking the CRH380 BL bogie frame as the research object,on the basis of summarizing the domestic and foreign scholars' research,the paper puts forward the research contents and methods.According to the relevant drawings,Using Solidworks 3D modeling software to solid modeling,and simplifying the model.The finite element model of the frame is established by Abaqus finite element analysis software.Static strength analysis and fatigue strength evaluation based on UIC615-4 standard.Analysis results show that,the static strength of the frame meets the strength requirement under the condition of abnormal load and simulated operation load.Using Goodman-Smith fatigue limit diagram to evaluate the fatigue strength of the frame,all the check points are located inside the closed curve,the fatigue strength of the frame meets the requirements.Using Brown-Miller multiaxial fatigue damage model based of critical plane method,Morrow formula to modify the mean stress,and the analysis of fatigue life prediction based on Fe-Safe software.Estimated results show that,the minimum life of the frame is 1396 million times,which appears at the lower cover plate and round hole over place of the air spring seat,greater than the 1000 million times of UIC615-4 standard.The fatigue life of the frame meets the design requirements.The reliability and sensitivity analysis of the frame is carried out by using the ANSYA probabilistic reliability module.Finally,the reliability of static strength is 1,the frame is safe and reliable.The allowable stress of the frame material has the greatest influence on the reliability of the static strength,the influence of vertical and lateral loads are second.Based on the p-S-N curve,the fatigue life of the frame is estimated.The estimated result of frame's fatigue life is 1365 million times,greater than the 1000 million times of UIC615-4 standard.The relative error between the results and the 1396 million times estimated by Fe-safe fatigue analysis software is about 2.2%.The fatigue life of the frame meets the design requirements.Model analysis was conducted on the frame,extracting the 1~8 order modal shapes of the bogie frame.The lowest frequency is obtained in the first order mode,the value is 32.3Hz,which is higher than the line frequency and the natural frequency of the body parts and so on,which avoids the occurrence of resonance and meets the requirements of the standard.