| Zugriffsnummer | 20397 |
| Dokumenttyp | Zeitschriftenartikel |
| Sprache | Englisch |
| Titel | On the uncertainty of single-number quantities for rating airborne sound insulation |
| Autor(in); Institution |
Wittstock, Volker; 1.7, Angewandte Akustik, PTB-Braunschweig
|
| Quelle/Jahr | Acta Acustica united with Acustica: 93 (2007), 3, 375 - 386 |
| ISSN | 1610-1928 (PRINT) ; 1861-9959 (ONLINE) |
| Verlag | Stuttgart: Hirzel |
| Zusammenfassung | Single-number quantities are widely used to characterise acoustic properties of building products and buildings. The uncertainty of these values is now investigated by analysing a large amount of round robin results. Methods are developed to calculate the uncertainty of the single number rating from third-octave band sound insulations and the associated uncertainties. The Monte-Carlo method is used to verify the calculation methods. It turns out that correlation effects between third-octave bands significantly influence the uncertainty of the single numer rating. Whereas an upper limit for the uncertainty can be calculated by assuming a full, positive correlation between all third-octave bands, the uncorrelated case does not provide a lower limit due to the occurrence of negative correlation. Since correlation effects cannot be predicted it is recommended to use the averaged uncertainties as derived from round robin tests until a deeper understanding of the governing mechanisms enables a calculation of the uncertainties. |
