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Über dieses Buch

This book describes the wave characteristics of contact lines taking wind into consideration and discusses new methods for detecting catenary geometry, pantograph slide fault, and catenary support system faults. It also introduces wire-irregularity detection methods for catenary estimation, and discusses modern spectrum estimation tools for catenary.
It is organized in three parts: the first discusses statistical characteristics of pantograph-catenary data, such as stationarity, periodicity, correlation, high-order statistical properties and wave characteristics of contact lines, which are the basis of pantograph-catenary relationship analysis. The second part includes geometry parameter detection and support-system fault detection in catenary, as well as slide-fault detection in pantographs, and presents some new detection algorithms and plans. The final part addresses catenary estimation, including detection of contact-line wire irregularities and estimation of catenary based on spectrum, and presents detection methods for contact-line irregularity and modern spectrum estimation tools for catenary.

Inhaltsverzeichnis

Frontmatter

Chapter 1. Overview of Detection and Estimation of High-Speed Railway Catenary

The current collection quality of pantograph-catenary system directly determines the stability and safe operation of power supply in high-speed railway, and is also one of the key factors that determine the maximum running speed of the train.
Zhigang Liu

Chapter 2. Statistical Characteristics of Pantograph-Catenary Contact Pressure

In order to grasp the basic characteristics of pantograph-catenary interaction and study the influence of parameters of the pantograph and the catenary on each other, the analysis of pantograph-catenary dynamic coupling is very important. The statistical characteristics of pantograph-catenary data are the basis of pantograph-catenary relationship analysis.
Zhigang Liu

Chapter 3. Wave Motion Characteristic of Contact Line Considering Wind

For the dynamic performance study of pantograph-catenary system, the wave motion characteristic of contact line is one of key points. The wave motion velocity is the main measure index of wave motion performance of contact line. A large number of researches have shown that the wave motion speed is one of the most important factors that affect the train speed of electric railway.
Zhigang Liu

Chapter 4. Geometry Parameters Detection of Catenary Based on Image Processing

.In order to prolong the service life of electric locomotive’s pantograph in electric railway and make the pantograph sliding abrasion uniform, the contact line in catenary system is arranged by “zigzags”. If the stagger of contact line is too low, it cannot efficiently prolong the service life of electric locomotive’s pantograph. If the stagger of contact line is too high, the out-of-limit contact line may occur in extreme cases, which will result in accidents, such as scraping or hitting pantograph. Therefore, the stagger detection of contact line is very necessary to ensure the safe operation of catenary in electric railway. In addition, in order to keep the proper contact pressure and good contact between catenary and pantograph, the height of contact line should be in a certain range. Therefore, the height detection of contact line is also necessary.
Zhigang Liu

Chapter 5. Slide Plate Fault Detection of Pantograph Based on Image Processing

Pantograph is a kind of current collecting device from the contact line to the locomotive. Due to the complex mechanical and electrical interaction between pantograph and catenary, the pantograph’s failure rate is always very high. Through the real-time monitoring for the pantograph state, the faults of pantograph can be found and the catenary state can also be judged in time, which is very beneficial to the repairmen and maintenance of pantograph and catenary. Because the pantograph works in an open environment for a long time and is affected by temperature, light, air pollution and other environmental factors influence, there are many kinds of faults.
Zhigang Liu

Chapter 6. Detection of Catenary Support System

.As an important part of the traction power supply system, the working state of catenary system is crucial to the train’s safe operation in high-speed railway. Since the complex mechanical and electrical interaction exists between pantograph and catenary system, the failure rate of catenary system is always high. Therefore, it is very necessary to detect and monitor the working state of the catenary fittings and eliminate the safety-threatening conditions in time.
Zhigang Liu

Chapter 7. Wire Irregularities Detection of Contact Line

The wire irregularity or unevenness is a general term for the irregular or uneven contact surface of contact line for pantograph-catenary interaction.It is a sum of all the major static catenary data, namely contact line height, stagger and wear, which reflect the geometry deformation of contact line and the wear and manufacturing defect of contact line surface.
Zhigang Liu

Chapter 8. Estimation of Catenary Based on Spectrum

The original idea of using the power spectrum density (PSD) analysis for catenary estimation is inspired by the study on track spectrum. In 1971, the International Union of Railways (UIC) published a research report that firstly proposed the concept, expression and unit of track spectrum, and discussed its measurement, computation, analysis method and application.
Zhigang Liu
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