高铁接触网无螺栓整体吊弦载荷谱编制与磨损失效损伤分析OA

As China's high-speed railways reach speeds of 350 km/h,the fatigue failure of catenary droppers under high-frequency vibration and cyclic stress has become critical.Traditional bolted droppers fracture due to stress concentration,yet the failure mechanisms and lifespan prediction of boltless droppers remain underexplored.This study employed pantograph-catenary dynamic simulation to analyze the dynamic response of boltless droppers under operational conditions.A novel fatigue load spectrum compilation method was proposed to characterize real-world load distributions,using adaptive kernel density estimation and Monte Carlo simulation.Fatigue tests were conducted,with fracture surfaces analyzed via scanning electron microscopy to reveal failure mechanisms.A wear model was developed to calculate the lifespan under various conditions,validated against the fatigue load spectrum.Results show the wear process comprises initial,stable,and severe wear stages,with failure occurring at an 8 mm upper wear thickness.An inverse power law model is fitted to experimental data,yielding a wear lifespan curve that correlates fatigue life with load variations.Furthermore,the cumulative wear damage derived from the fatigue load spectrum closely aligns with the damage induced by a single train passage,confirming the accuracy and practicality of the compiled spectrum.These findings can provide a scientific basis for reducing catenary maintenance costs and evaluating the lifespan of novel droppers.