Safety Assessment Method of Collector Shoe-Rail Relationship in Urban Rail Transits

In order to realize the safety assessment of the relationship between the collector shoe and contact rail before the initial operation of urban rail transits, the laser imaging, ultraviolet photoelectric sensing, and fiber bragg grating strain sensor are used to measure the dynamic geometric parameters of the contact rail, arcing and dynamic contact force of the collector shoe-rail, and hard spots of the collector shoe. According to the characteristics of each test parameter, their evaluation standards are determined. Four parameters, which are contact rail operation height, contact rail offset, arcing rate and dynamic contact of the collector shoe-rail, are selected to establishe the evaluation function of contact rail quality index through Topsis evaluation method; then based on the above-mentioned evaluation standards and evaluation functions, a set of safety evaluation methods are proposed for the collector shoe-rail relationship before the initial operation of urban rail transits. The inspect device for the collector shoe-rail relationship is used to collect the data of the Zhenlongxi−Yuancun section on Guangzhou Metro Line 21. The results reveal that for the entire line, the deviation between the dynamic geometric parameters and their design values does not exceed ± 5 mm, maximum arcing time lasts 53 ms, maximum arcing rate is 0.025%, maximum and minimum average contact force is 135.6 N and 119.8 N respectively, maximum hard spot is 29.8 g, and the quality index score is bigger than 92.89 points.