Experimental Fatigue Evaluation of Bogie Frames on Metro Trains

Metro vehicles have always been known for their high passenger density, frequent traffic flow and strong alternating loads due to severe running environment. As the major support component, bogie frame suffers from fatigue damages receives a intensity of interest. In this work, theoretical model is presented between measured strain structural stress via multiple load identification, wherein recognition matrices evaluations are defined according locations found in finite element analysis (FEA). The validated through random loading FE simulation, deviation within 1.1 kN. A vehicle experiment was performed on second head car six-car metro train. signed von Mises (SVM) calculated at critical with proposed method compared what measured. excessive part no more than 14.97%, comparing reconstructed amounts. Stress spectra were developed utilizing rain-flow counting evaluated terms damage accumulation rule optimal groups determined convergence analysis. evaluation indicates that, when mileage increases full life cycle 3,960,000 km, maximum equivalent reaches 0.35 0.46 gear box base amounts, respectively. Research outcomes suggest that offers an alternative assessment maintenance strategies vehicles, as well other types rail-transit vehicles.