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Narrowing longitudinally coupled prefabricated slab track maintenance duration with field data analysis of slab deformation under high temperature
Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit ( IF 2 ) Pub Date : 2021-01-10 , DOI: 10.1177/0954409720986266
Zai-Wei Li 1 , Xiao-Zhou Liu 2 , Hong-Yao Lu 1 , Yue-Lei He 1
Affiliation  

The deformation of longitudinally coupled prefabricated slab track (LCPST) due to high temperature may lead to a reduction in ride comfort and safety in high-speed rail (HSR) operation. It is thus critical to understand and track the development of such defects. This study develops an online monitoring system to analyze LCPST deformation at different slab depths under various temperatures. The trackside system, powered by solar energy with STM8L core that is ultra-low in energy consumption, is used to collect data of LCPST deformation and temperature level uninterruptedly. With canonical correlation analysis, it is found that LCPST deformation presents similar periodic variation to yearly temperature fluctuation and large longitudinal force may be generated as heat accumulates in summer, thereby causing track defects. Then the distribution of temperature and deformation data is categorized based on fuzzy c-means clustering. Through the distribution analysis, it is suggested that slab inspection can be shortened to 6 hours, i.e. from 10:00 am to 4:00 pm, reducing 14.3% track inspection workload from the current practice. The price of workload reduction is only a 2% chance of missed detection of slab deformation. The finding of this research can be used to enhance LCPST monitoring efficiency and reduce interruption to HSR operation, which is an essential step in promoting reliable and cost-effective track service.



中文翻译:

利用高温下板坯变形的现场数据分析缩小纵向耦合预制板坯的轨道维护时间

纵向耦合的预制平板轨道(LCPST)由于高温而变形,可能会导致高铁(HSR)操作的乘坐舒适性和安全性降低。因此,了解和跟踪此类缺陷的发展至关重要。本研究开发了一个在线监测系统,以分析在不同温度下不同板坯深度下的LCPST变形。轨道侧系统由太阳能和STM8L核心供电,具有极低的能耗,可用于不间断地收集LCPST变形和温度水平的数据。通过典型的相关分析,发现LCPST变形呈现出与逐年温度波动相似的周期性变化,并且随着夏季热量的积累,可能会产生较大的纵向力,从而导致轨道缺陷。然后基于模糊c均值聚类对温度和变形数据的分布进行分类。通过分布分析,建议将板坯检查的时间缩短至6小时,即从上午10:00到下午4:00,与目前的做法相比,可减少14.3%的轨道检查工作量。减少工作量的代价是错过检测板坯变形的机会只有2%。这项研究的发现可用于提高LCPST的监测效率并减少高铁运营的中断,这是促进可靠和具有成本效益的轨道服务的重要步骤。3%跟踪当前实践中的检查工作量。减少工作量的代价是错过检测板坯变形的机会只有2%。这项研究的发现可用于提高LCPST的监测效率并减少高铁运营的中断,这是促进可靠和具有成本效益的轨道服务的重要步骤。3%跟踪当前实践中的检查工作量。减少工作量的代价是错过检测板坯变形的机会只有2%。这项研究的发现可用于提高LCPST的监测效率并减少高铁运营的中断,这是促进可靠和具有成本效益的轨道服务的重要步骤。

更新日期:2021-01-11
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