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Modelling the acoustic signature and noise propagation of high speed railway vehicle

Polak Krzysztof, Korzeb Jarosław

Archives of Transport

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2022

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Vol. 64, iss. 4

73--87

EN

The proportion of high speed railway vehicles in the rolling stock of national carriers providing public transport services is constantly increasing. Currently, Alstom vehicles run at the highest speed on railway lines in Poland. The paper attempts to identify the acoustic signature of high speed railway vehicles. There are many works and studies aimed at identifying or defining the acoustic signature of high speed railway vehicles. However, the authors of these works carried out their research in a rather narrow scope, i.e. the measurement cross-section had only 1 or 2 measurement points with one micro-phone at each point. As part of the conducted experimental research, the location of testing grounds was determined, the measurement apparatus was selected and the methodology for carrying out measurements including the assessment of noise emission on curve and straight line were specified for electric multiple units. The object of the tests were railway vehicles of Alstom company, type ETR610, series ED250, the so-called Pendolino, moving on a selected measuring route without stops at a speed of 200 km/h. Measurements were carried out on the railway line no. 4 Grodzisk Mazowiecki – Zawiercie, section Grodzisk Mazowiecki - Idzikowice at kilometre 18+600 (curve) and 21+300 (straight section). When measuring the acoustic signals with a microphone array (4x2), 8 measurement microphones operating in the audible range were used. The microphones were placed at a distance of 5 m, 10 m, 20 m and 40 m from the track centre, at a height of 4 m (from the rail head) and at the rail head (approx. 0.8 m from the ground surface). In addition, an acoustic camera with 112 directional microphones was used to locate the main noise sources, which was located at a distance of approximately 20 m from the track centre-line. The identification of the main noise sources for high speed railway vehicles, basig on actual acoustic measurements, made it possible to isolate the dominant noise sources, as well as to find out the amplitude-frequency characteristics in the range from 20 Hz to 20 kHz, divided into one third octave bands.

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Pomiary hałasu pochodzącego od pojazdów kolejowych zwiększonych prędkości

Polak Krzysztof, Korzeb Jarosław

Problemy Kolejnictwa

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2019

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Z. 184

33--38

PL

Wraz z dynamicznym rozwojem transportu kolejowego, konieczne jest monitorowanie jego wpływu na ludzi oraz otaczające środowisko. Przedmiotem artykułu jest hałas, jako główny czynnik uciążliwości transportu kolejowego dla otoczenia. Na kolejach zwiększonych prędkości trwają poszukiwania dominujących źródeł negatywnego oddziaływania o charakterze akustycznym. Ustalenie przyczyn powstawania źródeł hałasu, ich skatalogowanie oraz budowa modelu oddziaływań akustycznych dla tych pociągów może przyczynić się do wydajnego projektowania środków ograniczających oddziaływania akustyczne. Autorzy dokonali przeglądu literatury na temat aktualnie stosowanych metod, przedstawili sposób oceny hałasu oraz zaprojektowali sposób realizacji badań poligonowych na obiektach rzeczywistych. Dokonano wyboru lokalizacji, uzyskano wymagane zgody, zgromadzono sprzęt pomiarowy wysokiej klasy i wykonano pilotażowe badania eksperymentalne, których wyniki przedstawiono w niniejszym artykule.

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Measurement of the Noise Originating From Class 2 High Speed Rail Vehicles

Polak Krzysztof, Korzeb Jarosław

Problemy Kolejnictwa

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2019

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Z. 184

93--98

EN

Due to the dynamic development of railway transport, it is necessary to supervise its impact on people and the surrounding environment. Noise is the main subject of this work, as it is the main railway transport factor that causes annoyance for the environment. Regarding increased speed railways, works are currently being conducted to find the dominant sources of negative acoustic effects. Determining the motives that cause rising of the noise sources, indexing them as well as creating an acoustic effects model for such trains should contribute to the efficient design of the means dedicated for minimizing acoustic effects. The authors have reviewed publications concerning the currently-utilized methods, described a noise assessment approach, and proposed a way to conduct field tests on real objects. A location was chosen, required permissions were obtained, sophisticated measuring equipment was collected, and pilot experimental tests were performed, with the results being described in this work.