Monitoring of current collectors on the railway line

Karwowski, Krzysztof; Mizan, Mirosław; Karkosiński, Dariusz

doi:10.3846/16484142.2016.1144222

Cited by 14 publications

(9 citation statements)

References 8 publications

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“…The primary information including the position, shape, attitude, deformation, and dynamics of the objects can be derived from the vision measurement. Consequently, this method has become highly advanced with extensive application in various fields such as industry [ 5 , 6 , 7 ], civil infrastructure [ 8 , 9 ], food [ 10 ], medicine health [ 11 , 12 ], transport [ 13 , 14 , 15 ], security surveillance, etc. Particularly, the vision-based measurement techniques have gathered increasing attention in aerospace research and applications [ 16 , 17 , 18 , 19 ].…”

Section: Introductionmentioning

confidence: 99%

A Novel Concentric Circular Coded Target, and Its Positioning and Identifying Method for Vision Measurement under Challenging Conditions

Liu

Guo

et al. 2021

Sensors

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Coded targets have been demarcated as control points in various vision measurement tasks such as camera calibration, 3D reconstruction, pose estimation, etc. By employing coded targets, matching corresponding image points in multi images can be automatically realized which greatly improves the efficiency and accuracy of the measurement. Although the coded targets are well applied, particularly in the industrial vision system, the design of coded targets and its detection algorithms have encountered difficulties, especially under the conditions of poor illumination and flat viewing angle. This paper presents a novel concentric circular coded target (CCCT), and its positioning and identifying algorithms. The eccentricity error has been corrected based on a practical error-compensation model. Adaptive brightness adjustment has been employed to address the problems of poor illumination such as overexposure and underexposure. The robust recognition is realized by perspective correction based on four vertices of the background area in the CCCT local image. The simulation results indicate that the eccentricity errors of the larger and smaller circles at a large viewing angle of 70° are reduced by 95% and 77% after correction by the proposed method. The result of the wing deformation experiment demonstrates that the error of the vision method based on the corrected center is reduced by up to 18.54% compared with the vision method based on only the ellipse center when the wing is loaded with a weight of 6 kg. The proposed design is highly applicable, and its detection algorithms can achieve accurate positioning and robust identification even in challenging environments.

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Section: Introductionmentioning

confidence: 99%

A Novel Concentric Circular Coded Target, and Its Positioning and Identifying Method for Vision Measurement under Challenging Conditions

Liu

Guo

et al. 2021

Sensors

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“…Vision systems have been very popular for over 20 years. They are used not only in military solutions (biometric systems, automatic missile guidance, reconnaissance systems) and technology [ 1 , 2 ] (among others, modern human–computer interfaces, examination of object features, sorting products, inspection of dimensions and contours, checking correctness and completeness of product performance, food control [ 3 ]), but also in medicine (laboratory tests [ 4 ], surgical procedures, telemedicine), cartography and ecology (site map analysis for mineral exploration or pollution monitoring), transport (rail [ 5 , 6 , 7 , 8 , 9 , 10 ], air), the exploration of the Earth and the Universe (interpretation of satellite and astronomical images), and security measures and surveillance, such as reading license plates, detecting explosives at airports, and monitoring crowd behaviour.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Camera and Optical System Parameters on the Uncertainty of Object Location Measurement in Vision Systems

Skibicki

Golijanek-Jędrzejczyk

Dzwonkowski

2020

Sensors

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The article presents the influence of the camera and its optical system on the uncertainty of object position measurement in vision systems. The aim of the article is to present the methodology for estimating the combined standard uncertainty of measuring the object position with a vision camera treated as a measuring device. The identification of factors affecting the location measurement uncertainty and the determination of their share in the combined standard uncertainty will allow determining the parameters of the camera operation, so that the expanded uncertainty is as small as possible in the given measurement conditions. The analysis of the uncertainty estimation presented in the article was performed with the assumption that there is no influence of any external factors (e.g., temperature, humidity, or vibrations).

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“…The results of modal analysis are used for: structural modifications, diagnostics of structure condition, synthesis of control device in active systems for vibration suppression, and verification and validation of numerical models such as finite element models [11][12][13][14]. Currently, many commercial simulation software suits based on the finite element method (FEM) allow the creation of discrete models of almost any linear dynamic structure, which remarkably enlarges the capacity and range of theoretical modal analysis.…”

Section: Introductionmentioning

confidence: 99%

Modal analysis of railway current collectors using Autodesk Inventor

Wilk

Judek

Karwowski

et al. 2018

MATEC Web of Conferences

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The paper presents the results of modal analysis of railway current collector type 160EC. In the first place, the analysis was carried out analytically for a simplified two lumped mass pantograph model. Then numerical analysis was conducted in the Autodesk Inventor (AI) on the prepared multibody model using the AI modal analysis algorithm, which is based on the finite element method (FEM). Model elements which are most relevant for attaining a correct representation of vibration properties when using AI modal analysis were indicated. The influence of selected parameters of modal analysis algorithm on results accuracy was investigated, e.g. the FEM mesh density. The natural frequencies and shapes of the first few vibration modes are shown. The results indicate that the frequencies of natural vibrations of the moving pantograph components are within the range of up to tens of hertzs. The possible use of results of pantograph modal analysis at the design stage and in the operation phase was also discussed.

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Monitoring of current collectors on the railway line

Cited by 14 publications

References 8 publications

A Novel Concentric Circular Coded Target, and Its Positioning and Identifying Method for Vision Measurement under Challenging Conditions

A Novel Concentric Circular Coded Target, and Its Positioning and Identifying Method for Vision Measurement under Challenging Conditions

The Influence of Camera and Optical System Parameters on the Uncertainty of Object Location Measurement in Vision Systems

Modal analysis of railway current collectors using Autodesk Inventor

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