Smooth rails are an important factor to reduce railway noise. An evaluation of the rail surface roughness can be done by means of roughness measurement devices. This is, however, a challenging task as measurements in the sub u.m domain have to be carried out under harsh conditions. This paper deals with requirements of rail roughness measurement systems and how these requirements can be fulfilled. Numerous measurement campaigns show that these measurements are difficult to carry out under the varying environmental conditions. These requirements will be explained in detail. An important task is to resolve a maximum accuracy of relative measurement devices. Contributions to the measurement error are discussed in detail. A calibration procedure is shown, that allows for minimising deterministic errors. Stochastic errors. however, are inevitable. These errors, can be minimised by an optimised design of the device. It will be shown how the inherent noise level of a device can be determined. Noise levels less than -20 dB relum are possible. Highly accurate measurement profiles in a wavelength range from 3 mm to 1.2 m are shown.
Practical implementations and benefits of highly accurate rail roughness measurements
2008
8 Seiten, 5 Bilder, 11 Quellen
Aufsatz (Konferenz)
Englisch
Practical Implementations and Benefits of Highly Accurate Rail Roughness Measurements
Springer Verlag | 2008
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