Assessing the repeatability and reproducibility of in situ measurements of sound reflection and airborne sound insulation index of noise barriers

In situ measurements of sound reflection and airborne sound insulation of noise barriers are usually done in Europe according to CEN/TS 1793-5. These methods have been substantially improved during the EU funded QUIESST project. In the frame of the same project, an inter-laboratory test has been carried out in order to assess the repeatability and reproducibility of the newly developed methods when applied to real-life samples. In this paper the main outcomes of the QUIESST inter-laboratory test are presented and discussed. The values of repeatability and reproducibility of sound reflection index and airborne sound insulation index are shown both in one-third octave bands and for the single-number ratings.