Strength Analysis And Test Verification On Bogie Frame Of70%Low Floor Train

With the development of economy in our country, the quantity of urban population increase, the pressure of urban traffic also increase. It’s urgent need for people to build green, convenient and efficient traffic. So it produces low floor and light rail vehicles. In order to ensure that trains run safely and reliably, the strength of train structure is very important.With the truck frame of70%low floor bullet trains as the object, the thesis use the software of HyperMesh to build the finite element model of the frame. According to standards of "UIC615-4" and "EN13749", it can determine the computational load. Static strength and fatigue strength are analyzed by finite element calculation of the frame with ANSYS. To verify the validity of the simulation analysis, the calculated values of big stress and the results of the bench test are analyzed with different working conditions, also the causes of error are discussed.Fatigue reliability analysis of the framework is inseparable from the line dynamic stress testing in the actual condition. Referring to the data from simulation and bench scale test, the fatigue control parts of the frame can be found. The dynamic stress data collected by experiment was processed to change the strain signal to stress signal. Then the stress amplitude is converted into equivalent stress amplitude. And according to fatigue criterion, the fatigue strength of the frame is determined. Different conditions are analyzed by typical waveform and spectrum diagram, then One-dimensional stress spectrum was done. The distribution function of the stress spectrum is got by mathematical statistics. The damage and life of each measuring point was estimated by S-N curves and Miner linear cumulative damage theory. Then it is determined that the train can run for30years.