Naslov
The Influence of Top Finishing of the Noise Barrier on its Acoustic Performance – Field Examination

Autori
Horvat, Marko ; Jambrošić, Kristian ; Domitrović, Hrvoje

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
Proceedings of EuroRegio2016 / Patricio, Jorge - Lisabon : Sociedade Portuguesa de Acústica, 2016, 1-8

ISBN
978-84-87985-27-0

Skup
EuroRegio2016

Mjesto i datum
Porto, Portugal, 13.06.2016. - 15.06.2016

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
railway noise; noise barrier performance; top finishing

Sažetak
Field measurements were made in order to examine the acoustic performance of a noise barrier built along a railway track depending on its top finishing. Three cases were considered: a reference barrier made of wood- cement panels, the same barrier topped with a highly absorptive flat panel, and the same barrier topped with a highly absorptive T-top section. The measurements were made at four distances from the barrier at the protected side, and at three different heights, giving a total of twelve receiver points. A reference measurement was made on the source side of the barrier as well. Instead of a train, a loudspeaker reproducing pink noise was used as the sound source. The attenuation between the reference microphone and each receiver point was calculated. The reference spectrum of railway noise was then used to simulate its foreseen spectrum at each receiver point. The final results were expressed as the overall A- weighted noise level the reference railway noise spectrum would have at each receiver point, and the improvement of acoustic performance of the barrier was assessed. The improvement is evident with both flat- and T- top in comparison with no top due to added height. The T-top finishing gives additional improvement over the flat finishing. The effect is more pronounced at lower heights and shorter distance between a receiver point and the barrier. Based on the measured values, the equivalent additional height of a flat barrier was calculated that would yield the same improvement as the added T-top section.

Izvorni jezik
Engleski

Znanstvena područja
Elektrotehnika

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