基于微动理论的整体吊弦损伤机理及优化研究

Research on Damage Mechanism and Optimization of Integral Dropper String Based on Fretting Theory

基于高速铁路接触网整体吊弦的材料和服役工况,结合有限元分析以及试验分析,对整体吊弦的损伤机理进行分析。结果表明:整体吊弦钳压管的结构及压接方式存在不合理处,吊弦的断丝、断股是由于微动磨损和疲劳断裂共同造成的,其中微动磨损在吊弦的断裂中具有重要影响。经多方面考量,提出新型整体吊弦的优化方案,包括改进压接结构,增进吊弦线耐疲劳性,以及改进心形环的结构,避免与接触线吊弦线夹之间摩擦伤线,从源头上提升设计、施工、制造和运维质量,降低零部件失效概率,提高耐久性和可靠性。

Based on the material and service conditions of the integral dropper string of the high-speed railway catenary, as well as the finite element analysis and experimental analysis, the damage mechanism of the integral dropper string was analyzed. The results show that unreasonable points exist in the structure and crimping method of the integral hoisting tongs.The wire and strand breakage of the dropper string are caused by fretting wear and fatigue fracture, with the fretting wear having a great influence on the breakage of the dropper string. After multifaceted considerations, the optimization scheme of the new integral dropper string was proposed, including improving the crimping structure and the fatigue resistance of the dropper string, and improving the structure of the heart-shaped ring to avoid frictional damage between the contact wire clamp and the dropper string clamp, to improve design, construction, manufacturing and operation quality from the source,to reduce component failure probability, and to improve durability and reliability.