A Survey on Automatic Inspections of Overhead Contact Lines by Computer Vision

Yu, Long; Gao, Shibin; Zhang, Dongkai; Kang, Gaoqiang; Zhan, Dong; Roberts, Clive

doi:10.1109/tits.2021.3119023

Cited by 18 publications

(10 citation statements)

References 109 publications

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“…Naturally, non-contact methods are mainly based on usage of optical sensors, instruments, and computer vision algorithms [3][4][5][6]. We can also find other measurement approaches using more sophisticated methodologies: laser measurements operating in high-speed trains in Japan [7], LiDAR [8,9], or radar [10] systems.…”

Section: Introductionmentioning

confidence: 99%

Automated Measurement of Traction Line Parameters for Railways

Koniar¹,

Hargaš²,

Sindler³

et al. 2024

LabVIEW - Virtual Instrumentation in Education and Industry

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In Slovakia, various rail track segments are being rebuilt due to increased railroad speed and safety standards. Assembly wagons were fitted with an automated measurement device to assess the condition and geometry of the traction lines. The theory behind measuring fundamental traction line parameters like line height and stagger is discussed in this book chapter, along with the development of a measurement electronic device with appropriate sensors and a LabVIEW application for evaluating measured data and controlling and interacting with the electronic device. The Railways Research and Development Institute at Vrútky (Slovakia) is where the system was tested and put into use. This work also demonstrates effective and robust collaboration between the academic environment and praxis. The possibilities of using LabVIEW in industrial applications and its cooperation with the developed measuring device will be presented in this book chapter. The possibilities of communication of the device with the developed software and various methods of algorithm design using several structures found in the LabVIEW development environment will be presented.

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Section: Introductionmentioning

confidence: 99%

Automated Measurement of Traction Line Parameters for Railways

Koniar¹,

Hargaš²,

Sindler³

et al. 2024

LabVIEW - Virtual Instrumentation in Education and Industry

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“…Stereovision measurement using two or more line-scan cameras is a better solution for the measurement of contact wire wear on rolling stock [7,14]. The advantages of stereovision measurement are the high scanning frequency and the high resolution because of the one-dimensional imaging chip of the line-scan camera.…”

Section: Introductionmentioning

confidence: 99%

“…For this application, the scanning plane of the line-scan camera is perpendicular to the direction of the train. However, it is still a challenging work since it has to overcome several obstacles, such as the image quality during day and night, the measurement resolution, and the variations in both contact wire height and stagger [7,14]. Great efforts have been made to overcome the above challenges.…”

Section: Introductionmentioning

confidence: 99%

Measurement Method for Contact Wire Wear Based on Stereovision

Zhou,

Qin,

et al. 2024

Sensors

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The contact wire wear is an important parameter to ensure the safety operation of electric railways. The contact wire may break if the wear is serious, which leads to transportation interruptions. This study proposes an optical measurement method of contact wire wear, using stereovision technology. The matching method of stereovision based on line-scan cameras is proposed. A lookup-table method is developed to exactly determine the image resolution caused by the contact wire being in different spatial positions. The wear width of the contact wire is extracted from catenaries’ images, and the residual thickness of the contact wire is calculated. The method was verified by field tests. The round-robin tests of the residual thickness at the same location present excellent measurement repetitiveness. The maximum difference value between dynamic test results and ground measurement results is 0.13 mm. This research represents a potential way to implement condition-based maintenance for contact wire wear in the future in order to improve the maintenance efficiency and ensure the safety of catenary infrastructure.

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“…Moreover, the contact wire in operating conditions has a relatively high electrical potential, for instance, 3 kV DC or 25 kV AC, which requires galvanic separation of measuring sensors. Various diagnostic and monitoring systems are developed to keep OCL in proper technical condition during operation [ 7 , 8 , 9 , 10 , 11 ]. The search for reliable, safe, inexpensive, and precise measuring and monitoring methods is still ongoing [ 12 , 13 , 14 , 15 , 16 , 17 , 18 ].…”

Section: Introductionmentioning

confidence: 99%

“…Another stereo vision method proposed for measuring only the static geometry of OCL is described in [ 8 , 9 , 14 , 15 , 36 ].…”

Section: Introductionmentioning

confidence: 99%

Novel Vision Monitoring Method Based on Multi Light Points for Space-Time Analysis of Overhead Contact Line Displacements

Wilk

Gelman

Skibicki

et al. 2022

Sensors

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The article presents an innovative vision monitoring method of overhead contact line (OCL) displacement, which utilizes a set of LED light points installed along it. A light point is an, LED fed from a battery. Displacements of the LED points, recorded by a camera, are interpreted as a change of OCL shape in time and space. The vision system comprises a camera, properly situated with respect to the OCL, which is capable of capturing a dozen light points in its field of view. The monitoring system can be scaled by increasing the number of LED points and video cameras; thus, this method can be used for monitoring the motion of other large-size objects (e.g., several hundred meters). The applied method has made it possible to obtain the following novel results: vibration damping in a contact wire is nonlinear by nature and its intensity depends on the wire vibration amplitude; the natural frequency of contact wire vibration varies, and it is a function of vibration amplitude; the natural frequency of contact wire vibration also depends on the wire temperature. The proposed method can be used to monitor the uplift of contact and messenger wires in laboratory conditions, or for experimental OCL testing, as well as for verifying simulation models of OCL.

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A Survey on Automatic Inspections of Overhead Contact Lines by Computer Vision

Cited by 18 publications

References 109 publications

Automated Measurement of Traction Line Parameters for Railways

Automated Measurement of Traction Line Parameters for Railways

Measurement Method for Contact Wire Wear Based on Stereovision

Novel Vision Monitoring Method Based on Multi Light Points for Space-Time Analysis of Overhead Contact Line Displacements

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