Measuring rail roughness in view of reducing rolling noise emission is a challenge for field instrumentation. Direct measurements can be carried out with contacting relative displacement measuring systems. However, the rail length that can be covered is limited and surveying a wide network turns out not to be practical. On the other hand, indirect methods based on acceleration measurements may be used for monitoring purposes. In this paper, the feasibility of roughness measurements based on interferometric techniques is discussed. Such a measurement could be carried out at normal train operation speed. The problems of optical measurements in real-time conditions are taken in due consideration. A key point of the discussion is the use of a system for vibration attenuation to be mounted under a vehicle to suspend the optical sensing device. The structure for a complete measurement device is proposed together with the expected performance. The measurement of rail roughness using interferometry looks promising. The requirements for operation at normal train speed are met for a measurement performed under laboratory conditions. A significant amount of work needs to be done to fully master the unavoidable complexity of field work. However, the instruments needed seem to be there, as well as theoretical understanding and this makes the authors confident that progress in this matter will occur.
Interferometric rail roughness measurement at train operational speed
Interferometrische Messung der Schienenrauigkeit bei Betriebsgeschwindigkeit des Zuges
2006
9 Seiten, 4 Bilder, 35 Quellen
Aufsatz (Konferenz)
Englisch
Interferometric rail roughness measurement at train operational speed
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