QUIESST database of European NRD

Detailed analyses

In addition to the overview of the single number ratings and the frequency spectra, more detailed analyses and comparisons between the different methods have been performed. In this section the following analyses and comparisons are presented:

  • Correlation between laboratory and in-situ method for sound insulation over all barrier types (EN 1793-2 & prEN 1793-6)
  • Correlation between laboratory and in-situ method for sound insulation for each material where sufficient data were available (EN 1793-2 & prEN 1793-6)
  • Correlation between laboratory and in-situ method for sound absorption/reflection over all barrier types (EN 1793-1 & CEN/TS 1793-5)
  • Correlation between laboratory and in-situ method for sound absorption/reflection for each material where sufficient data were available (EN 1793-1 & CEN/TS 1793-5)
  • Correlation between in-situ sound insulation measurements performed in front of a post and measurements performed in front of a noise barrier element over all barrier types (prEN 1793-6)
  • Correlation between in-situ sound insulation measurements performed in front of a post and measurements performed in front of a noise barrier element for each material where sufficient data were available (prEN 1793-6)
  • Comparison between different methods for in-situ sound reflection, where sufficient data were available (CEN/TS 1793-5 and NFS 31089)
  • Comparison between different methods for in-situ sound insulation, where sufficient data were available (prEN 1793-6 and NFS 31089)
  • Cluster analysis of the collected results for each measurement method separately in order to identify NRD families based on the frequancy spectra