Research and Prospect on High-Speed Catenary Component Failure
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摘要: 接触网零部件的失效会严重影响接触网系统的运行安全，接触网系统的服役可靠性是列车和线路安全运营的重要基础.为促进高速接触网装备技术的发展，在结合大量现场调研结果的基础上，系统分析并总结了我国高速铁路接触网零部件服役过程中出现的铝合金定位钩与定位支座磨损、吊弦线疲劳、螺栓连接松动、终端锚固线夹抽脱以及零部件腐蚀问题等五类典型失效问题及其产生的原因，指出微动损伤（微动磨损与疲劳）与恶劣的服役环境是导致接触网零部件典型失效的主要因素；介绍了国内外学者对微动磨损、微动疲劳、螺栓松动、应力腐蚀等相关失效机理的研究现状；展望了高速铁路接触网零部件的失效机理研究，冲滑复合磨损、多股绞线结构微动疲劳、螺栓松动、载流条件下疲劳和腐蚀疲劳这几个方面是今后需要重点研究的领域，并指出研究载流条件对疲劳损伤影响的重要性.Abstract: The failure of catenary components seriously affects the operational safety of a catenary system, and the reliability of the catenary system provides an important foundation for the safe operation of trains and railway lines. In order to promote the development of high-speed catenary equipment technology, the typical failures and causes of catenary components were systematically summarised and analysed based on the results of field research, including the wear of aluminium-alloy positioning hooks and supports, fatigue of droppers, bolt loosening, slipping of terminal anchoring clamps, and corrosion of parts. It was noted that fretting damage (fretting wear and fretting fatigue) and poor working conditions were the main factors behind the failure of catenary components. Then, the research status of fretting wear, fretting fatigue, bolt loosening, and stress corrosion in China and abroad were introduced. Moreover, research prospects were proposed for the damage mechanism of impact-sliding wear, fretting fatigue of multi-wire strands, bolt loosening, fatigue damage under the condition of current-carrying and corrosion fatigue, and the importance of a high current for studying damage was indicated.
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Key words:
- catenary /
- fretting damage /
- failure /
- research prospect
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图 3 定位钩与定位支座磨损表面SEM形貌以及EDX分析
Figure 3. SEM and EDX images of failure surface of positioning hook and support
图 6 定位线夹第一圈工作螺纹SEM形貌及EDX分析
Figure 6. SEM images and EDX analysis of the first working round thread of positioning clamp
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