Uncertainty evaluation and implications of spectrum adaption terms in determining the airborne sound insulation in building elements

The paper presents the implications of spectrum adaptation terms in determination of airborne sound insulation characteristics. The work discusses two major aspects pertaining to the usage of spectrum adaptation terms in determining the airborne sound insulation, viz., uncertainty evaluation and applicability to other noise sources. A parametric study correlating the uncertainties in single-number quantities with corresponding value of single-number quantities for sandwich gypsum constructions and heavy weight sandwich facade and roof constructions is presented. The present analytical investigations reveal that expanded uncertainty difference in two frequency ranges 50 Hz to 5 kHz and 100 Hz to 3.15 kHz is observed as 2.8 dB for Ctr adaptation term and 1.6 dB for C-spectrum term.