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Fraunhofer-IPM: Measuring the geometry of moving trains
Rail accidents have a particularly severe impact at critical points such
as tunnels or where railways enter densely populated areas. It is at such
points that a profile scanner developed by Fraunhofer-IPM can now measure
the geometry of passing trains. The Sector Profile Scanner SPS identifies
possible incursions into the clearance outline, for example as a result
of shifting loads, open loading hatches or detached couplings. The
four scanners attached to masts on the measuring portal register the
shape of the train along with the end surfaces of the wagons and gaps
between them. The SPS records a profile every 3.5 centimetres on trains
travelling at 100 km/h. In approximately one millisecond the scanner registers
900 measuring points and then provides an adequate resolution
at full speed. The measurement data is used to generate a 3D model of
the train, which is then compared with nominal profiles stored in the system
in order to create the required train geometry. In addition to SPS numerous
improvements and additional functions for its various rail measurement
systems are also being displayed by Fraunhofer-IPM.
Fraunhofer-Institut für Physikalische Messtechnik IPM,
D-Freiburg im Breisgau
Hall 4.1, Booth 225
Tobias Steinhäußer
+49 (0)89-12051308
tobias.steinhaeusser@zv.fraunhofer.de
www.ipm.fraunhofer.de
SPS sector profile scanner
Fraunhofer-IZFP: Thermographic testing of train wheels
The advantages of testing train wheels by means of inductively induced
thermography are being demonstrated by the Fraunhofer Institute
for Non-Destructive Testing Methods IZFP at InnoTrans 2012.
This method involves rotating a wheel and using a system of coils to
induce eddy currents, which spread out in areas close to the surface.
Any faults such as cracks will interfere with the spread of these eddy
currents, causing characteristic temperature fields in the surrounding
area. These can be recorded using a thermal imaging camera.
In contrast to the magnetic powder test which is currently used for
testing surfaces, it permits automated recording and objective evaluation
of the image data. Thermography also reveals hidden faults.
Unlike magnetic powder testing the readings obtained provide information
about the geometry of the faults, and especially about the
depth of any surface cracks. The process is also eco-friendly because
it does not rely on the use of any chemical substances in order
to indicate faults.
Fraunhofer-Institut Zerstörungsfreie Prüfverfahren IZFP,
D-Saarbrücken
Hall 4.1, Booth 225
Tobias Steinhäußer
+49 (0)89-12051308
tobias.steinhaeusser@zv.fraunhofer.de
www.izfp.fraunhofer.de
Simulation of temperature distribution in the area around a crack
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