Detection and Estimation Research of High-speed Railway by Zhigang Liu

By Zhigang Liu

This e-book describes the wave features of touch strains taking wind into account and discusses new equipment for detecting catenary geometry, pantograph slide fault, and catenary aid glitches. It additionally introduces wire-irregularity detection equipment for catenary estimation, and discusses sleek spectrum estimation instruments for catenary.
It is prepared in 3 components: the 1st discusses statistical features of pantograph-catenary facts, resembling stationarity, periodicity, correlation, high-order statistical houses and wave features of touch traces, that are the root of pantograph-catenary courting research. the second one half comprises geometry parameter detection and support-system fault detection in catenary, in addition to slide-fault detection in pantographs, and provides a few new detection algorithms and plans. the ultimate half addresses catenary estimation, together with detection of contact-line cord irregularities and estimation of catenary in line with spectrum, and offers detection equipment for contact-line irregularity and sleek spectrum estimation instruments for catenary.

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Extra info for Detection and Estimation Research of High-speed Railway Catenary

Sample text

2 Stationarity Test Methods of Pantograph-Catenary Contact Pressure According to European Standard EN50318, EN50367 and China Railway Standard, the technical indicators of performance evaluation for pantograph-catenary contact pressure mainly include the contact pressure average value Fm , standard deviation r, statistical minimum value, statistical maximum value, etc. These indicators can be computed directly using the sampled time series, which practically mean that the sampled data of contact pressure is stationary and has the ergodicity.

J Sound Vib 303 (3):405–427 54. Wang H, Liu Z, Han Z et al (2014) Feature extraction of pantograph-catenary contact force power spectrum of electrified railway. J China Railway Soc 36(11):23–28 55. Kusumi S, Fukutani T, Nezu K (2006) Diagnosis of overhead contact line based on contact force. Q Rep RTRI 47(1):39–45 56. Rønnquist A, Nåvik P (2015) Dynamic assessment of existing soft catenary systems using modal analysis to explore higher train velocities: a case study of a Norwegian contact line system.

The results showed that the random data of magnetic levitation track vertical irregular signal has high non-stationarity. In [2], the round test method was adopted to check the track irregularity of Qinhuangdao-Shenyang Passenger Railway of China. The results showed that the majority of rail irregular samples were smooth or weakly stationary and could be approximately treated as stationary random process. In [3], the round test method was adopted to check the irregular samples of the welded joint rail surface in Jingshan Line and Guangshen Line of China.

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