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Internship on indirect measurement of track decay rate and combined roughness

Engels, R.A. (2012) Internship on indirect measurement of track decay rate and combined roughness.

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Abstract:This report provides an overview of the work that was performed during a 14-week internship in the field of railway acoustics. In many situations rolling noise is considered to be the most dominant source of noise. This is generally the case for speeds between 40 and 220 km/h. Rolling noise is caused by the combined vibration of wheel and track. The vibrations are induced by the rolling interaction between the running surface of wheel and rail. Both rail and wheel structure radiate sound to the environment. Key excitation parameters are wheel and rail roughness in the wavelength range from 2-400 mm. The parameter that describes the attenuation of the vibration amplitude is referred to as the track decay rate. Both the roughness of wheel and rail and the track decay rate can be measured by means of a direct measurement. This is currently the most used method in the industry. In contrast to direct methods, indirect measurement methods can be used to measure the combined roughness and the track decay rate during the pass-by of train. The combined roughness and vertical track decay rate are determined from vertical rail vibration during a train pass-by. The measurement of sound pressure during the same pass-by, enables the one to deduce a vibro-acoustic transfer function for rolling noise, which can be used for the characterization of vehicles and tracks. In this report the direct and indirect measurement methods are compared. Furthermore the influence of different measurement parameters, such as pass-by speed, accelerometer position and train type on the track decay rate and combined roughness are investigated. The reports that were written have their own summary.
Item Type:Internship Report (Master)
Faculty:ET: Engineering Technology
Subject:52 mechanical engineering
Programme:Mechanical Engineering MSc (60439)
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