Curves in tram and train tracks sometimes cause the trains to make an unpleasant high-pitched noise that is called squeal and flanging noise. In the field of rail noise, this is one of the biggest sources of nuisance.
Measuring noise deriving from curves in train tracks is difficult due to the varying nature of the sound. For the Dutch transport company RET in Rotterdam, Level.Tools has developed an algorithm that separates curve noise from other tram sounds (rolling noise, noise from track changes, etc.) and other sounds (warning bells, etc.). The algorithm can distinguish between the two different types of curve sound: squeal and flanging.
The squeal and flanging detector (in Dutch: Booggeluiddetector) requires a wav file as input and gives back single values such as SEL (curve sound isolated), occurrence in percentage, etc. The curve sound detector is validated during a summer of measuring two trams and is supplied to SensorNet to be built into their measuring stations.
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