Comparison between laboratory and in-situ methods for measuring sound reflection properties of noise barriers
Monday 1 june, 2015, 12:00 - 12:20
0.2 Berlin (90)
The REFLEX project was an Austrian national Project funded by the national Road and Rail administrations (ASFINAG, ÖBB), the National Ministries for Transport and for Environment (BMVIT, BMFLUW) and federal states (Upper Austria, Styria, Carinthia, Tyrol, Vorarlberg). The project was led by the Austrian Institute of Technology AIT and involved 8 different Austrian noise barrier manufacturers as well as two scientific partners (AIT and the company TAS). The main scope of this project was to investigate the reflection properties of different noise barriers for the specific case of the Austrian market with special attention to neighbouring countries. The research considered laboratory measurements according to EN 1793-1, in-situ measurements in the near field according to CEN/TS 1793-5 and far-field measurements in a distance of 25 meters from the barrier. The results of the laboratory method and the in-situ method were compared to the far-field results. The newly developed QUIESST method was also used to test the different noise barriers. Additionally, also BEM-simulations have been performed in order to validate the results obtained. This paper will mainly focus on the comparison between the laboratory method according to EN 1793-1 and in-situ methods for measuring sound reflection properties of noise barriers (according to CEN/TS 1793-5 and to the new developed QUIESST method), not only for the so-called single number ratings, but also for the frequency spectra. All analyses have been performed not only for the standardised noise spectrum for road traffic according to EN 1793-3, but also considering the newly developed spectrum for railways according to the FprEN 16272-3-2.
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