Výsledky vyhledávání - "M.G. Dittrich"

Proposals for Improved Measurement Methods for Curve Squeal and Braking Noise

Autor: M.G. Dittrich, H.W. Jansen

Publikováno v: Nielsen, J.C.O.et al, Noise and Vibration Mitigation for Rail Transportation Systems : Proceedings of the 11th International Workshop on Railway Noise, Uddevalla, Sweden, 9–13 September 2013, 595-602
Notes on Numerical Fluid Mechanics and Multidisciplinary Design ISBN: 9783662448311

Improved methods for measuring curve squeal and braking noise have been proposed within the ACOUTRAIN project, intended as input to future standards. In this paper an outline of these methods is given and the underlying considerations are explained.

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Separation of rolling noise and aerodynamic noise by in-service measurement of combined roughness and transfer functions on a high speed slab track

Autor: H.W. Jansen, M.G. Dittrich

Publikováno v: Maeda T.Gautier P.E.Hanson C.E.et al, Noise and Vibration Mitigation for Rail Transportation Systems, 118, 479-486
Notes on Numerical Fluid Mechanics and Multidisciplinary Design ISBN: 9784431539261

Combined sound and vibration measurements during train pass-bys can be used to quantify contributions from the excitation and transmission of rolling noise. This is useful for the identification of sound sources and the assessment of the track contri

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Railway noise measurement method for pass-by noise, total effective roughness, transfer functions and track spatial decay

Autor: C.J.C. Jones, M.G. Dittrich, F.G. de Beer, M.H.A. Janssens

Publikováno v: Journal of Sound and Vibration, 3-5, 293, 1007-1028

In recent years, considerable effort has been spent at a European level to establish comprehensive methods for the experimental assessment of rolling noise emission of rail-bound vehicles and tracks. This work was concentrated in the European METARAI

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Railway source models for integration in the new European noise prediction method proposed in Harmonoise

Autor: C. Talotte, Matias Ringheim, Xuetao Zhang, Dorothée Stiebel, M.G. Dittrich, Paul van der Stap

Publikováno v: Journal of Sound and Vibration, 3-5, 293, 975-985

The purpose of the Harmonoise European project is to provide an engineering model for the propagation of road and rail traffic noise which requires, for a better accuracy than existing models, the distinction between source output and propagation. In

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Improved measurement methods for railway rolling noise

Autor: M.H.A. Janssens, M.G. Dittrich

Publikováno v: Journal of Sound and Vibration, 3, 231, 595-609

Some of the issues related to railway noise type testing are discussed and potential improvements to existing procedures are put forward. New and improved methods that also go beyond the scope of type testing are presented that help to characterize a

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Roughness on Dutch railway wheels and rails

Autor: P.C. Dings, M.G. Dittrich

Publikováno v: Journal of Sound and Vibration, 1, 193, 103-112

Surface roughness on 150 railway wheels and on the rails of 30 sites in the Netherlands have been measured. Block braked wheels were found to show higher roughnesses than the rail at any site. The smoothest rail is 8 dB smoother than the smoothest wh

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