Zbornik radova Koridor 10 - Kirilo Savić

3rd International Scientific and Professional Conference
CORRIDOR 10 - a sustainable way of integrations
v
v x
h
2
x
h
a
1
x
[mm/m or ‰] , (4)
where:
v – twist [mm/m or ‰],
a – length of a measuring base [m],
h 1 , h 2 – cross levels measured at the beginning and end of the measuring base [mm].
Fig. 8. Twist in the area of a transition curve [7]
2.2.2. Geometric quality levels
According to [1] track geometry quality is defined as assessment of excursions from the mean or
designed geometrical characteristics of specified parameters in the vertical and lateral planes which
give rise to safety concerns or have a correlation with ride quality.
Defining the geometric quality levels can be significant in [5]:
• optimization of track geometry maintenance works;
• optimization of vehicle ride quality and dynamic loading of the track;
• harmonizing vehicle acceptance procedures.
Three indicators can describe the track geometric quality:
• extreme values of isolated defects;
• standard deviation over a defined length, typically 200 m;
• mean value.
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