铁道科学与工程学报2026，Vol.23Issue(3)：1059-1070,12.DOI:10.19713/j.cnki.43-1423/u.T20250715
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
Compilation of load spectrum for boltless integral catenary dropper in high-speed railway and analysis of wear-induced failure damage
摘要
Abstract
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.关键词
接触网吊弦/弓网动力学/疲劳载荷谱/疲劳试验/寿命预测Key words
catenary dropper/pantograph-catenary dynamics/fatigue load spectrum/fatigue test/life prediction分类
交通工程引用本文复制引用
胡颢蓝,高仕斌,于龙,郑昕..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[J].铁道科学与工程学报,2026,23(3):1059-1070,12.基金项目
国家重点研发计划项目(2023YFB4302002) （2023YFB4302002）
国家自然科学基金资助项目(52177115) （52177115）
