Research purposes:Welded turnouts are one of the key technologies for continuously welded rail,and the intricate climate in plateau areas complicates their stress state.In order to ensure the safe operation of trains,it is necessary to conduct long-term real-time health monitoring on them.This paper constructs a real-time health monitoring system for welded turnouts in plateau areas and conducts online monitoring on a group of turnouts for two months.The corresponding analysis is carried out on rail temperature,displacement of switch point,and fracture of switch blade during the monitoring period.Research conclusions:(1)The trend of rail temperature changes is consistent with that of air temperature changes.The highest rail temperature always exceeds the daily maximum air temperature,with an average difference of 11.75 ℃.Generally speaking,the occurrence time of rail temperature is about 3 hours earlier than that of air temperature.(2)The minimum rail temperature is typically concurrent with the air temperature,usually occurring between 7:00 to 8:00 in the morning.(3)There is a strong linear relationship between rail temperature and air temperature,with the rail temperature changing by approximately 1.5 ℃ for every 1 ℃ change in air temperature.(4)The trend of longitudinal displacement at the switch point is consistent with the temperature changes in both air and rail,showing a linear relationship with air temperature.(5)This research can provide data support for the maintenance and repair of welded turnout in plateau areas.
关键词
高原地区/无缝道岔/健康监测/轨温变化
Key words
plateau area/welded turnout/health monitoring/rail temperature change
维普
万方数据