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

By Zhigang Liu

This publication describes the wave features of touch strains taking wind into account and discusses new equipment for detecting catenary geometry, pantograph slide fault, and catenary help glitches. It additionally introduces wire-irregularity detection tools for catenary estimation, and discusses glossy spectrum estimation instruments for catenary.
It is prepared in 3 components: the 1st discusses statistical features of pantograph-catenary information, resembling stationarity, periodicity, correlation, high-order statistical houses and wave features of touch traces, that are the foundation of pantograph-catenary dating research. the second one half contains geometry parameter detection and support-system fault detection in catenary, in addition to slide-fault detection in pantographs, and offers a few new detection algorithms and plans. the ultimate half addresses catenary estimation, together with detection of contact-line twine irregularities and estimation of catenary in response to spectrum, and offers detection equipment for contact-line irregularity and smooth spectrum estimation instruments for catenary.

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Contact pressure stationarity analysis for different distances The contact pressure signals from different distances are adopted for their stationarity analysis. 1. Because the signal’s time-frequency spectrum should be first computed using the surrogate data method, considering that the signal’s length can influence the estimation accuracy of time-frequency spectrum, the minimum length of contact pressure data is 400 points, and that is to say that the sampling distance is 200 m. 1 Contact pressure signal stationarity analysis for different distances Line name Sampling distance (m) Stationarity pass rate (%) Up line of Hukun Line 1000–3000 500–1000 200–500 1000–3000 500–1000 200–500 1000–3000 500–1000 200–500 1000–3000 500–1000 200–500 100 96 80 100 92 82 100 95 87 100 96 90 Down line of Hukun Line Up line of Jingguang Line Down line of Jingguang Line 3000 m is almost stationary.

Low pass filtering method The trend term of contact pressure is caused by low frequency vibration. Finite Impulse Response (FIR) filter can be adopted conveniently. The Z transform form of FIR filter is listed below. Ptend ðzÞ ¼ ðb1 þ b2 zÀ1 þ Á Á Á þ bnb þ 1 zÀnb ÞPðzÞ ð2:18Þ The trend term extraction with FIR filter is shown in Fig. 8. It can be found that the correlation between the trend term and data is strong, and the trend term is more sensitive to the data fluctuation. 3 Periodicity of Pantograph-Catenary Contact Pressure 37 Fig.

1. Because the signal’s time-frequency spectrum should be first computed using the surrogate data method, considering that the signal’s length can influence the estimation accuracy of time-frequency spectrum, the minimum length of contact pressure data is 400 points, and that is to say that the sampling distance is 200 m. 1 Contact pressure signal stationarity analysis for different distances Line name Sampling distance (m) Stationarity pass rate (%) Up line of Hukun Line 1000–3000 500–1000 200–500 1000–3000 500–1000 200–500 1000–3000 500–1000 200–500 1000–3000 500–1000 200–500 100 96 80 100 92 82 100 95 87 100 96 90 Down line of Hukun Line Up line of Jingguang Line Down line of Jingguang Line 3000 m is almost stationary.

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