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Abstract

The assessment procedure currently used for the accreditation of building acoustics laboratories is given in the standard ISO 140-2. It is based on the deviations between values obtained in the new laboratory and round robin results whereupon the number of third-octave values outside of the critical differences is simply counted. A new procedure is proposed which additionally accounts for the amount of deviation from the round robin mean value. Thus, it can be considered as a refined continuously scaled version of the current procedure. The new method has been checked by applying it to the data from a round robin survey of a heavy test wall. Besides the comparison between individual laboratory results and round robin mean results, an additional single measurement, carried out in each laboratory, is proposed to verify the results.

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References

Guide to the expression of uncertainties in measurement. First edition, 1993, corrected and reprinted 1995, International Organization for Standardization (Geneva, Switzerland)

DIN EN ISO 140-1:1997 Acoustics – Measurement of sound insulation in buildings and of building elements – Part 1: Determination, verification and application of precision data. 1997.

ISO 140-2:1991 Acoustics – Measurement of sound insulation in buildings and of building elements – Part 2: Determination, verification and application of precision data.

ISO 5725-2:1994 Accuracy (trueness and precision) of measurement methods and results – Part 2: Basic method for the determination of repeatability and reproducibility of a standard measurement method

Schmitz

Meier

, and Raabe

: Inter-laboratory test of sound insulation measurements on heavy walls: Part I – Preliminary test. Building Acoustics 6 (3), pp. 159–169, 1999.

Meier

Schmitz

, and Raabe

: Inter-laboratory test of sound insulation measurements on heavy walls: Part II – Results of main test. Building Acoustics 6 (3), pp. 171–186, 1999.

Meier

: The significance of the total loss factor for the determination of airborne sound insulation in laboratory test facilities. (in German) PhD-thesis, RWTH Aachen, Shaker, 2000.

Bronstein

I.N.

, and Semendjajew

K.A.

: Pocket book of mathematics. (in German) 25. Auflage, B.G. Teubner Verlagsgesellschaft, Stuttgart, 1991.

ISO 140-3:1995 Acoustics – Measurement of sound insulation in buildings and of building elements – Part 3: Laboratory measurements of airborne sound insulation of building elements

Using round Robin Test Results for the Accreditation of Laboratories in the Field of Building Acoustics in Germany

Abstract

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References