Real time wheel condition monitoring system is in use for validation…more
In the frame of our work-package 3, we develop a noise related track maintenance tool, in the form of an on-board measurement system. Lab scale tests were made in order to distinguish how noise changes when the wear mechanism in a sliding contact shifts from normal wear to severe and catastrophic wear using a pin-on-disc tribometer. The full scale tests were carried out with a rapid transit (metro) train, type C20, equipped with microphones that continuously measured the sound pressure near the wheel rail contact. The same kind of transfer from mild to severe/catastrophic wear was identified on the full scale test as in the pin-on-disc test, which could be confirmed by studying the surface topography and the morphology of the wear particles. Moreover, the full scale test results show that the sound pressure changed significantly when transferring from mild to severe wear in agreement with the pin-on-disc test results. At present, a real time condition monitoring system is set up in Stockholm (Metro line 1) in order to validate the results.