Abstract
The paper contains a survey of mobile scanning systems for measuring the railway clearance gauge. The research was completed as part of the project carried out for the PKP (PKP Polish Railway Lines S.A., Warsaw, Poland) in 2011–2013. The authors conducted experiments, including a search for the latest solutions relating to mobile measurement systems that meet the basic requirement. At the very least, these solutions needed to be accurate and have the ability for quick retrieval of data. In the paper, specifications and the characteristics of the component devices of the scanning systems are described. Based on experiments, the authors did some examination of the selected mobile systems to be applied for measuring the clearance gauge. The Riegl (VMX-250) and Z+F (Zoller + Fröhlich) Solution were tested. Additional test measurements were carried out within a 30-kilometer section of the Warsaw-Kraków route. These measurements were designed so as to provide various elements of the railway infrastructure, the track geometry and the installed geodetic control network. This ultimately made it possible to reduce the time for the preparation of geodetic reference measurements for the testing of the accuracy of the selected systems. Reference measurements included the use of the polar method to select profiles perpendicular to the axis of the track. In addition, the coordinates selected were well defined as measuring points of the objects of the infrastructure of the clearance gauge. All of the tested systems meet the accuracy requirements initially established (within the range of 2 cm as required by the PKP). The tested systems have shown their advantages and disadvantages.
Highlights
The measurement of the structural gauge of railway lines results from the necessity to build a system for their codification in Poland by 2030
System for the Codification of Railway Lines”, AGH University of Science and Technology conducted experiments involving the search for the latest solutions relating to mobile measurement systems that
The system was adapted to allow the installation of the measurement systems to be examined; The system was wagon adapted to adapted
Summary
The measurement of the structural gauge of railway lines results from the necessity to build a system for their codification in Poland by 2030. All railway lines should be covered by such a system This problem has existed since the 1990s, when the first studies of the construction for such systems was being developed for the transport of cargo with an excessive loading gauge and combined transport gauge. The scientific goal of the research was to propose a methodology for measuring the structure gauge of railway lines, based on the literature of the existing solutions and testing of selected systems. The following research tasks have been completed in this project: obtain photogrammetric data in the aspect of the spatial modelling of the clearance gauge of railway buildings and structures, develop a methodology for building a spatial vector model of the railway infrastructure clearance gauge, automatically texture elements of the space that describe the clearance gauge of railways, develop a methodology for updating the clearance gauge of objects at railway lines, develop a spatial structure for the database of the railway infrastructure clearance gauge, develop a methodology for the determination of the kinematic clearance gauge of cargos, develop a method for the interactive assignment of codes to railway lines, develop the assumptions and structure of an IT system for managing the process of assigning codes to railway lines
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