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Feasibility study for the development of a system to detect the loss of one ore more waggons
on freight trains
for the Deutsche Bahn AG in cooperation with the Ingenieurbüro Herwig Marschelke.
The goal of this study was the analysis of a method to detect the loss of one or more waggons on freight trains
by verifying the presence of an acoustical signal.
The acoustical signal was coupled into the main compressed air supply at the end of the train. The signal was
detected on the locomotive and as long as the acoustical signal was present, the train was complete.
One of the main problems was the very high volume of the moving air, which went up to as much as 140 decibel
when the brakes were applied or disengaged. This forced that a lambda/4 resonator for the acoustical signal
had to be developed to dampen the noise.
pressure box mounted on the test waggon |
microphone adapter in main air supply pipe |
measurement equipment in the engine cab |
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