Evaluated Uncertainties for Measurements of Airborne Sound Attenuation between Rooms in Buildings

Abstract

The standard ISO/IEC 17025:2005 “General requirements for the competence of testing and calibration laboratories” introduces the necessity of evaluation of measurement uncertainties for making them reliable and comparable. In order to fulfill acoustic comfort conditions indoors, building acoustic have to establishes a set of criteria for the acoustic performance of the building. These criteria may be expressed in terms of permissible minimum values for normalized noise reduction NNR, noise reduction NR or apparent transmission loss ATL. This paper discusses the uncertainty sources and presents a methodology for the calculation of uncertainty of the airborne sound insulation between rooms carried out according to the of standards ASTME 336 and examples of uncertainty budget, evaluated for the measurement results of the sound insulation. The range of values obtained for the measurement results uncertainty is 0.68 to 1.77.