Results 151 to 160 of about 108,862 (203)

Directivity of railway noise sources

Journal of Sound and Vibration, 2006
In the Harmonoise project the description of vertical and horizontal directivities of railway noise sources has been required. Other features of the source description are sound power level spectra in third octave bands as a function of speed and the physical location of the different sound sources. Based on systematic investigations methods to
Xuetao Zhang, Hans G. Jonasson
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Noise from railway bridge

Applied Acoustics, 1998
Abstract Noise is assessed by the time-average sound level, LAT(x,D). The process of noise generation on a bridge and on an embankment is characterized by two parameters, λ and μ , which can be estimated from simultaneous measurements, LAT(x1,D) and LAT(x2,D).
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The noise factor in railway locomotives

Applied Ergonomics, 1982
This article concerns the problem of acoustic work conditions on railway locomotives. The objective results of sonometric surveys in locomotive cabins are compared with subject data received from locomotive crews obtained by means of a specific questionnaire 'The Subjective Estimation of Noise'. The analysis touched 9 type of locomotives; steam, diesel
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IMPROVED MEASUREMENT METHODS FOR RAILWAY ROLLING NOISE

Journal of Sound and Vibration, 2000
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 and analyze rolling noise more accurately.
Dittrich, M.G., Janssens, M.H.A.
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Railways: Noise and Vibration Issues

Noise & Vibration Worldwide, 1999
Paul Eade, General Manager of Acoustic Design Ltd., describes how railways offer him and his team of noise control and vibration engineers varied and interesting technical ...
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Multiresolution analysis of environmental noise signals: an application to railway noise

Proceedings of the 21st IEEE Instrumentation and Measurement Technology Conference (IEEE Cat. No.04CH37510), 2004
The most part of acoustic signals associated to real world phenomena are non-stationary. A particularly important example is represented by signals associated to train transits, whose noise environmental impact is evaluated by considering the features associated to each of them.
CALIGIURI L. M, SABATO, Adolfo
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Measures to abate railway noise

INTER-NOISE and NOISE-CON Congress and Conference Proceedings
An important environmental issue in densely populated areas, such as Germany or France, is the problem of noise. Traffic noise from cars, railway vehicles and airports located in close proximity to the city is not only annoying for residents; it also leads to serious health issues and has an enormous negative economic impact. Unlike road traffic noise,
Rene WEINANDY, Percy APPEL
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Reactions to railway noise in Denmark

Journal of Sound and Vibration, 1983
Abstract People's reactions to railway noise were studied along seven Danish railway lines with traffic intensities from 30 to about 300 trains per 24 hours. The calculated sound levels varied between 43 and 71 dB(A) for LAeq,24h and between 78 and 102 sB(A) for LAmax. 615 persons were interviewed. One third of these felt strongly or somewhat annoyed
T.V. Andersen, K. Kühl, E. Relster
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Scale modeling of railway noise barriers

The Journal of the Acoustical Society of America, 1998
Noise barriers are an efficient way of reducing the noise from railways, particularly the noise produced in the region of the rails and wheels. Several designs of noise barrier have been suggested in the literature which aim to improve the insertion loss over that obtainable from a plane screen of the same height.
David C. Hothersall, Kirill V. Horoshenkov, Philip A. Morgan   +2 more
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Interfermetric acoustic imaging of railway noise

Journal of Sound and Vibration, 1988
Abstract Far field acoustics deals with intensity distribution as a function of angle α and frequency η. Interferometric processing is able to display the radiated intensity as a function of η and α even for moving sources such as trains. A time constraint defines the duration of observation to avoid blur effects.
B. Escudié, M. Chiollaz, E. Parent de Curzon   +2 more
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