The Vision System for Diagnostics of Railway Turnout Elements

Kisilowski, Jerzy; Kowalik, Rafał

doi:10.1007/978-3-319-97955-7_15

Cited by 7 publications

(10 citation statements)

References 3 publications

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“…Turnouts operated on side tracks should meet the same requirements as turnouts installed on main tracks. The principles of the online railroad turnout diagnostic system are presented in [ 71 ]. It should be pointed out that the process of the real analysis of the turnout image makes it possible to record a lot of information, which can be useful for the damage analysis during the next technical tests.…”

Section: Measurements and Key Parameters In Turnout Technical Condition Assessmentmentioning

confidence: 99%

Railroad Turnout Wear Diagnostics

Kisilowski

Kowalik²

2021

Sensors

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The article presents a few issues related to the technical condition of a railway turnout, an important element of the railway network where about 90% of railway accidents occur. In the first part of the article, the results of railway turnout wear are presented. A comparison of normal forces (in wheel–rail contact) in vehicle traffic on straight track without a turnout and normal forces occurring when a rail vehicle passes a turnout is presented. Then, turnout wear processes for selected speeds are presented. In the next part of the paper, the possibilities of using a vision system are presented, which, in combination with tools for image processing analysis, makes it possible to detect wear and distances between the key elements of a railway turnout. The main idea of the proposed online diagnostic system solution is to use the analysis of received images (photos) with the help of a vision system. The basic problem to be solved in the proposed system was to develop algorithms responsible for generating wear areas from high-resolution images. The algorithms created within the work were implemented and tested in the MATLAB software environment. The presented method is an original procedure for diagnosing turnout elements for each time instant. The proposed system is compatible with railway traffic control systems.

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Section: Measurements and Key Parameters In Turnout Technical Condition Assessmentmentioning

confidence: 99%

Railroad Turnout Wear Diagnostics

Kisilowski

Kowalik²

2021

Sensors

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“…There are two elements in the turnout which determine proper functioning of the railway turnout. These are a switch point and a frog [10,11] shown in Figure 1. The basic components and geometrical elements of the regular turnout are: beginning of turnout 1 (in pre-switch contact point); end of turnout 2 (in contact point behind the frog); turnout geometric center, 0, which is the intersection of the stock rail axis with the closure rail axis; radius R of the closure rail curve; turnout angle α (angle between the axes of the stock rail and the closure rail), slant of the turnout-tangent α-expressed as a vulgar fraction with one in the numerator; switch points, 4; rheostats, 5; frog, 6; wing rails, 7; guard rails, 8; connecting rails, 9; AOB triangle.…”

Section: Structure Turnouts Railwaysmentioning

confidence: 99%

Numerical Testing of Switch Point Dynamics—A Curved Beam with a Variable Cross-Section

Kisilowski

Kowalik

2020

Materials

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The article presents mathematical considerations on the dynamics of the springing switch point being an element of the railway junction. Due to the structure of the switch point, mathematical analysis was divided into two stages: The first stage refers to the analysis of the dynamics of the switch point as a beam of variable rectilinear stiffness to which three forces (coming from three closures of switch drives) placed in the initial section of the switch point are applied. The next stage of the analysis concerns an identical beam, but curved, with a variable cross-section. In both cases, the beam is subjected to a vertical force resulting from forces from the rail vehicle. The calculations refer to a switch point of 23 m length and a curvature radius R = 1200 m. The first stage of the switch point analysis refers to the movement of a rail vehicle on a straight track, and the second stage concerns the rail vehicle movement on a reverse path. This article also provides an analysis of mode vibrations of a curved beam with a variable cross-section, and variable inertia and stiffness moments (further in the article the changes will be referred to as beam parameter changes). It is assumed that the beam is loaded with vertical forces (coming) from a rail vehicle. The solution was found by applying the Ritz method, which served to present the fourth-order partial equations as ordinary differential ones. The numerical research whose results are given aimed to define how the changes in beam parameters and vertical load affect mode vibrations of the beam.

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“…Sae Siew et al [11] noted the torsional effects of railway turnout crossings on track-support structures. Turnouts, by virtue of their construction and purpose, are one of the subassemblies that form part of the railway infrastructure with the greatest number of accidents featuring railway vehicles [47]. The main points of derailments during train passage are the points of the switch and crossing (crossing).…”

Section: Related Workmentioning

confidence: 99%

“…When the wheels of the rolling stock pass through a switch on a crossing, forces can be twice as high as when driving on the track. Kisilowski and Kowalik [47] presented the results of research on the application of a visual system for monitoring the diagnosis of individual elements of railway turnouts. This diagnostic system performs a real-time check of the surface condition of the switch point and crossing and determines the geometric values of both elements.…”

Section: Related Workmentioning

confidence: 99%

“…The crossing is the part of the turnout where the rails intersect. Crossings are usually subject to rail wear [13,47,60], which is a result of the friction of the surface caused by the wheels of the rolling stock. The rules for obtuse crossing assembly are defined in [77] and refer to the angular position values of the obtuse crossings, which should be placed exactly opposite each other and parallel.…”

Section: Surveying the Geometric Center Double Slip Turnout-rkpd Iwewmentioning

confidence: 99%

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Measurement of the Geometric Center of a Turnout for the Safety of Railway Infrastructure Using MMS and Total Station

Kampczyk

2020

Sensors

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The turnouts in railway infrastructure constitute bottlenecks, limiting the capacity of the entire railway network. Due to their design and geometry, these turnouts force speed limits. The need to ensure the proper technical condition of turnouts has prompted ongoing scientific research and the use of modern technological solutions. Until now, there have been no tests for the correct location of the geometric center of a double and outside slip turnout with the related geometric relationships. Therefore, the main objective of this research was to demonstrate the position of the geometric centre of a double slip turnout and the geometric conditions of the curves of circular diverted tracks by measuring the horizontal versines and geometric irregularities of turnouts. The application of this surveying method, with reference to obtuse crossings and arising from geometric dependencies in the double and outside slip turnout, is defined and implemented (also known as a method for checking the correct location of the geometric center of a turnout—Surveying and Monitoring of the Geometric Center of a Double and Outside Slip Turnout (SMDOST)) via the Magnetic-Measuring Square (MMS) and electronic Total Station. This method also recommends measuring the horizontal versines of the diverted tracks. This paper presents the results of field measurements using the SMDOST and MMS methods, which were applied to carry out an analysis and evaluation of the turnout geometry conditions, thereby presenting the irregularities that cause turnout deformations. The validity of the SMDOST method using MMS and Total Station was thus confirmed. The observations from the conducted research indicate that neglecting measurements of the geometry of the turnouts resulted in additional irregularities in their conditions.

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The Vision System for Diagnostics of Railway Turnout Elements

Cited by 7 publications

References 3 publications

Railroad Turnout Wear Diagnostics

Railroad Turnout Wear Diagnostics

Numerical Testing of Switch Point Dynamics—A Curved Beam with a Variable Cross-Section

Measurement of the Geometric Center of a Turnout for the Safety of Railway Infrastructure Using MMS and Total Station

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