Comparison between laboratory and in-situ methods for measuring sound reflection properties of noise barriers
Invited paper
AIT
Monday 1 june, 2015, 12:00 - 12:20
0.2 Berlin (90)
Abstract:
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.