Algorithm for automatic wear estimation of railway contact strips based on 3D scanning results

Judek, Sławomir; Jarzębowicz, Leszek

doi:10.1109/icepe.2014.6970004

Cited by 22 publications

(10 citation statements)

References 3 publications

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“…This paper is related to previous works [4], [5], which concern CCS diagnostics. In [4] authors proposed a new Laser Scanning Inspection System (LSIS) for CCS diagnostics.…”

Section: Introductionmentioning

confidence: 81%

“…The proposed test profiles are based on a desire trapezoidal shape corresponding to a factory new CCS [5]. The desire trapezoidal profile is combined with defect pattern, located in the middle.…”

Section: A a Damaged Ccs Test Profilementioning

confidence: 99%

“…In [4] authors proposed a new Laser Scanning Inspection System (LSIS) for CCS diagnostics. Afterwards, they complimented the system with an automatic wear estimation algorithm based on the 3D data processing [5]. Experimental tests confirmed good performance of this algorithm.…”

Section: Introductionmentioning

confidence: 95%

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Wavelet Transform-Based Approach to Defect Identification in Railway Carbon Contact Strips

Judek

Jarzębowicz²

2015

ElAEE

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Pantographs of electric rail vehicles are fitted with carbon contact strips, which slide along the contact wire of catenary to provide constant electrical contact. Contact strips are exposed to wear and damages. Using damaged contact strips significantly increases the risk of catenary rupture. Therefore, their technical condition has to be inspected frequently. In previous work a 3D laser scanning system was proposed for recording contact strips surface shape when vehicles pass an inspection point on a railway line. The system was complimented with an effective automatic wear estimation algorithm. However, this algorithm is insensitive to some shallow defects which are considered hazardous. This paper presents defects identification approach based on differentiation of contact strips profiles. It is assumed that the hazard of catenary rupture corresponds to the peak value in the differentiated profile. A wavelet transform was used to allow for robust differentiation of profiles featured by low signal-tonoise ratio. A method for choosing well-balanced dilatation parameter was proposed, in order to obtain good accuracy of differentiation of both smooth and narrow-edged contact strip defects. Results of simulations implemented in Matlab confirm that the proposed approach can be applied to an algorithm aiming for automatic defects identification.

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“…This paper is related to previous works [4], [5], which concern CCS diagnostics. In [4] authors proposed a new Laser Scanning Inspection System (LSIS) for CCS diagnostics.…”

Section: Introductionmentioning

confidence: 81%

Section: A a Damaged Ccs Test Profilementioning

confidence: 99%

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Wavelet Transform-Based Approach to Defect Identification in Railway Carbon Contact Strips

Judek

Jarzębowicz²

2015

ElAEE

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“…The system uses a specialized camera and a laser line generator to acquire 3D scan of CCS surface. A specialized data processing algorithm has been applied for automatic CCS Manuscript received 18 September, 2015; accepted 10 March, 2016. wear estimation [9]. During the research a question has arisen on the accuracy of the estimated wear value.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Measurement Errors in Rail Vehicles’ Pantograph Inspection System

Judek¹,

Jarzębowicz²

2016

ElAEE

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The paper presents an approach to evaluation of height measurement errors in laser scanning inspection system. The system, consisting of a laser line generator and a specialized camera, is dedicated to diagnosing carbon contact strips of railway vehicles' pantographs. While height measurement resolution is easily computable based on system parameters, determining the measurement error is troublesome due to numerous impacts. As width-to-height ratio of the scanned object is very high, typical patterns applied in references for error determination cannot be used. A set of real-case contact strips have been selected and used as patterns for determining scanning system errors. Both peak and RMS errors have been quantified to evaluate accuracy of wear estimation and defect identification, respectively. Index Terms-Current collector; fault diagnosis; measurement by laser beam; pantograph; railway transportation.http://dx.

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“…In contrast, diagnostics of current collectors is usually performed with the use of stationary diagnostic stands, where static characteristics of the collector and suspension of the slipper are tested [9]. Evaluation of the technical condition of strips is carried out using 3D visualization devices [10][11][12][13]. On the other hand, correctness of cooperation between the collector and the contact line can be monitored with the use of stationary measurement points which help to determine the correctness of the collector's adjustments based on displacements of the contact line caused by its impact when a vehicle passes through the diagnostic stand.…”

Section: Introductionmentioning

confidence: 99%

Experimental verification of visual method for measuring displacements of contact line elements

Skibicki

2018

MATEC Web of Conferences

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Abstract. The increase of rail vehicles speed, as well as the increase of their power, puts high demands on the power delivery system for traction vehicles The most critical point in the vehicle's power supply circuit is the contact between the current collector and contact wires. Ensuring a reliable co-operation of the current collector and contact line, requires technical development of the contact line and current collector construction, as well as improvement of diagnostic systems of these components. This is translated into the need to develop new measurement methods, which allow for more complete definition of the parameters of these elements of traction vehicle power supply system. Each new measurement method requires verification, performed by calibrating or comparing the results with another measurement method which has already been tested. The article presents results of experimental verification of a visual method for measuring the displacement of contact wires, with a proven method based on short range laser rangefinders and calliper as reference measurement.

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Algorithm for automatic wear estimation of railway contact strips based on 3D scanning results

Cited by 22 publications

References 3 publications

Wavelet Transform-Based Approach to Defect Identification in Railway Carbon Contact Strips

Wavelet Transform-Based Approach to Defect Identification in Railway Carbon Contact Strips

Analysis of Measurement Errors in Rail Vehicles’ Pantograph Inspection System

Experimental verification of visual method for measuring displacements of contact line elements

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