Zbornik radova Koridor 10 - Kirilo Savić

3rd International Scientific and Professional Conference
CORRIDOR 10 - a sustainable way of integrations
systems to ensure that all track-recording vehicles produce comparable results when measuring the
same track [2]. In order to achieve this, it is essential to ensure that the methods of measurement are
equivalent, the transfer functions of the filters are identical and the outputs and data storage formats
are comparable.
The part 3 "Measuring systems - Track construction and maintenance machines" [3] and the part 4
"Measuring systems - Manual and lightweight devices" [4] specifies the minimum requirements that
shall be met by measuring systems fitted on track construction and maintenance machines, or on track
geometry measuring trolleys and manually operated devices, to give an evaluation of track geometry
quality when measuring one or more parameters.
The fifth part of this European standard "Geometric quality levels" defines the minimum requirements
for the quality levels of track geometry and specifies the safety related limits for each parameter [5].
The sixth part "Characterisation of track geometry quality", which is still under approval, characterizes
the quality of track geometry based on parameters defined in the first part and specifies the different
track geometry classes which have to be considered. It covers the following topics:
• description of track geometry quality;
• classification of track quality according to track geometry parameters;
• considerations on how this classification can be used.
A detailed analysis of the first and the fifth part of EN 13848 is provided in this paper.
2.2.1. Characterisation of track geometry
The European standard EN 13848-1 applies to all track geometry parameters including:
• Track gauge (Figure 4),
• Longitudinal level (Figure 5),
• Cross level (Figure 6),
• Alignment (Figure 7), and
• Twist (Figure 8).
All these parameters are determined by the current coordinates of the corresponding points of the left
and right rail relative to a fixed rectangular XYZ co-ordinate system (Figure 3) [1]. The relative coordinate
system is centred to the track with clockwise rotation and X-axis represents an extension of
the track towards the direction of running, Y-axis is parallel to the running surface, and Z-axis is
perpendicular to the running surface and points downwards.
1 running direction
2 running surface
3 track co-ordinate system
Fig. 3. Relationship between the axes of the track co-ordinate system [1]
Track gauge, G, is defined as the smallest distance between lines perpendicular to the running
surface intersecting each rail profile at points P 1 i P 2 in a range from z p =0 mm to z p =14 mm below the
running surface (Figure 4) [1]:
1.1.1
G x y x y x , (1)
G '
p ' 2 p 1
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