Abstract
AbstractOne of the basic conditions guaranteeing safe and collision-free operation of rail vehicles is maintaining the structure gauge. Verification of the location of rail infrastructure components is carried out using various measurement techniques. This article describes the accuracy of the gauge measurement with the use of a scanning tachymeter. Tachymetric measurements and laser scanning technology were used in the experimental study of the tram loop area. The analysis covered the possibility of using a point cloud to determine geometrical relationships among the track, traction poles and the overhead line. The quality of the laser scanning data in terms of the measurement frequency, the laser beam angle of incidence per object and the average reflection intensity was examined. Performed verification was based on the data from tachymetric measurements. In the tested area, the track consists of straight sections and several circular arcs of small radii and variable curvature. The specific geometry of the track required calculation of the gauge extension parameters depending on the curve radius. In addition, a horizontal track alignment design was prepared. The designed location of the track and extended dimensions of the structure gauge were used to verify the correct spatial position of the current track in relation to the infrastructure elements.
Highlights
Recent years have seen a significant development in laser scanning technology and popularisation of its applicationsThe most popular of the conducted studies include testing geometry and maintenance of tunnels [1,2], automatic detection of track geometry [3,4], automatic recognition of track components [5] and track centres [6,7,8] as well as structure gauge measurement [9,10]
Data obtained with various measuring sensors such as vision systems based on video cameras and thermal imaging cameras constitute a valuable complement to point clouds originating from laser scanning
Their merge resulted in a common cloud of points representing spatial imaging of objects located at the tramway loop, among others, the tram track and poles as well as elements of overhead electric traction
Summary
The most popular of the conducted studies include testing geometry and maintenance of tunnels [1,2], automatic detection of track geometry [3,4], automatic recognition of track components [5] and track centres [6,7,8] as well as structure gauge measurement [9,10]. Data obtained with various measuring sensors such as vision systems based on video cameras and thermal imaging cameras constitute a valuable complement to point clouds originating from laser scanning Data from these systems can be employed, among others, for the analysis of structure gauge [11], the location of track faults [12,13], the wear analysis of the overhead power traction cables [14,15] and the location of short circuits [16]. The use of terrestrial laser scanning may have economic justification in the case of inventory surveys of small and geometrically complex objects These may include a bridge, tunnel, switch or a tram loop. The study necessitated conducting an analysis of the current regulations for tramway design [23,24,25] and inventory surveys [26,27]
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