A tuned damping device for reducing noise from railway track

Thompson, D.J.; Jones, Chris; Waters, T.P.; Farrington, David P.

doi:10.1016/j.apacoust.2006.05.001

Cited by 101 publications

(64 citation statements)

References 7 publications

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“…The contribution of those two noise sources -the wheel and the rail -to the overall noise level mainly depends on the design of wheels and track, the roughness spectrum and the train velocity [6]. Excepting for the high speeds, both the rail and the wheel are important noise sources, with similar contributions to the overall noise level.…”

Section: Mitigation Techniques and Methods For The Rolling Noisementioning

confidence: 99%

On the Rolling Noise Reduction by Using the Rail Damper

Dumitriu¹,

Cruceanu²

2017

JESTR

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This paper discusses the possibilities of mitigation of the rolling noise in the railway vehicles by means of the rail dampers. In this context, the generation mechanism for this type of noise is therefore described. The active techniques and methods of control over the rolling noise, focused on the track infrastructure and the rolling stock are enumerated. The highlight is the rail damper from the perspective of its practical implementation and the review of the most important results concerning the reduction of the rolling noise in many European countries. The conclusions validate the difficulty found in a correct evaluation of the efficiency in the rail dampers and of their effect upon the track infrastructurerequirements for costly investments.

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Section: Mitigation Techniques and Methods For The Rolling Noisementioning

confidence: 99%

On the Rolling Noise Reduction by Using the Rail Damper

Dumitriu¹,

Cruceanu²

2017

JESTR

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“…Thus it can be used: -to determine dynamic properties of tracks for typical noise measurements (for ISO 3095 [3]), i.e. to determine track suitability for the conduct of typical measurements, -as dynamic parameter in the separation of noise sources (vehicle and track) [24], -to determine indirect roughness of rail vehicle wheels [24], -as parameter for evaluation of various vibration attenuation systems [21,25].…”

Section: Track Vibration Decay Ratementioning

confidence: 99%

Mjerenje stupnja prigušenja vibracija na klasičnim kolosiječnim konstrukcijama

2016

JCE

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The rail-track vibration damping level, as one of key properties for determining proportion of rail track influence in the total rail traffic noise and vibration levels, is estimated in the paper. A detailed overview of research conducted so far on dynamic properties of rail tracks is given, and the methods presented are compared on two test sections. The data processing method, various accelerometer positons, and various types of modal hammers as excitation sources, are also considered in the analysis of measurement results. The results obtained by various analyses are compared to each other so as to increase accuracy in the determination of the vibration damping level. Mjerenje stupnja prigušenja vibracija na klasičnim kolosiječnim konstrukcijama U radu se ocjenjuje stupanj prigušenja vibracija na kolosijecima, jednog od ključnih svojstava pri određivanju utjecaja kolosijeka u ukupnim razinama buke i vibracija od prometovanja tračničkih vozila. Prikazan je i detaljan pregled znanstvenih istraživanja na temu dinamičkih svojstava kolosijeka, a navedene metode uspoređene su na dvije ispitne lokacije. Nadalje, u analizi rezultata mjerenja razmatra se metoda obrade podataka, različite pozicije akcelerometara i različiti tipovi modalnih čekića kao izvora pobude. Rezultati dobiveni različitim analizama međusobno su uspoređeni u svrhu što preciznijeg određivanja stupnja prigušenja vibracija.

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“…In a previous study by Thompson et al (2007), it was shown that using an absorber with two tuning frequencies, the loss factor peak in the decay rate curve can be broadened, giving a greater noise reduction for the same overall mass. Such a system has been implemented here using the same procedure as above.…”

Section: Masses In Parallelmentioning

confidence: 99%

“…Such a system has been implemented here using the same procedure as above. In the nominal arrangement (at 10 ) the tuning frequencies are selected as 630 and 1350 Hz corresponding to the optimum determined by Thompson et al (2007). Firstly, the decay rate of the track is determined for an arrangement in which the masses are placed in parallel, giving a dynamic stiffness,…”

Section: Masses In Parallelmentioning

confidence: 99%

See 1 more Smart Citation

A methodology for developing high damping materials with application to noise reduction of railway track

Ahmad

2009

The Journal of the Acoustical Society of America

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For application in damping treatments, elastomeric materials should have a high damping loss factor, but this is inevitably linked to a strong temperature-dependence of the dynamic properties. A methodology is developed that allows a material to be formulated for a particular damping application where temperature-dependence has to be taken into account. The methodology is applied to the case of a tuned absorber system used for damping the vibration of a railway track. This is required to be effective over a temperature range -20 to 40 .To investigate the effect of the temperature on the performance of a rail damper, a simple Timoshenko beam model of the track vibration is used, to which are added single-frequency and dual-frequency tuned absorbers. The results show that a high noise reduction can be achieved for the optimum stiffness, provided that the loss factor is between about 0.25 and 0.4.In order to study the generic effects of high damping versus constant stiffness, the time-temperature superposition principle is used to convert frequency-dependence to temperature-dependence for a notional material with constant loss factor. This is used in the prediction of decay rates and thereby noise reduction. In addition, a weighted noise reduction is studied by using measured rail temperature distributions. This temperatureweighted noise reduction allows a single number measure of performance to be obtained which can be used to assess various elastomeric materials in order to determine the optimum material for a given situation.Two types of viscoelastic material, butyl and EPDM rubbers with various amount of fillers and plasticisers are investigated. The properties of both rubbers have been measured over the range of temperatures for frequencies 300-3000 Hz. For this a test rig had to be modified. For butyl, the best combination of filler and plasticiser gives temperature weighted noise reductions up to 5.9 dB(A). Butyl rubber is suitable for use in the rail absorber giving high noise reductions between 0 and 40 . The best EPDM compound gives a temperature-weighted noise reduction up to 6.2 dB(A). Comparing these two rubbers, EPDM is more suitable for low temperatures below 10 and butyl is more suitable for higher temperatures above 10 .

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A tuned damping device for reducing noise from railway track

Cited by 101 publications

References 7 publications

On the Rolling Noise Reduction by Using the Rail Damper

On the Rolling Noise Reduction by Using the Rail Damper

Mjerenje stupnja prigušenja vibracija na klasičnim kolosiječnim konstrukcijama

A methodology for developing high damping materials with application to noise reduction of railway track

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