Intercomparison of measurements of noise attenuation by double glazed windows in frames
The intercomparison presented in this report deals with laboratory measurements of the sound insulation of double-glazed framed windows. It follows a previous intercomparison which dealt with window panes without frames. The aim of the project was to determine the measurement precision associated with a measurement procedure better defined than the one in the present ISO Standard 140/3. Measurements were carried out by 17 laboratories from the EC countries on two windows that had different kinds of glazing. The measurement guidelines given to the participating laboratories referred to the ISO standard and additionally described in detail the two source positions and the mounting conditions. Measurements were also required to be made at frequencies lower than 100 Hz in preparation for a possible extension of the ISO standard to low frequencies. The data of only 15 laboratories were processed, because one laboratory gave incomplete results, and another did not comply with the requirements of the measurement guidelines. It is concluded that, in general, a reasonable agreement between laboratories can be achieved when the source positions and the mounting conditions are prescribed. However, large variations can arise for test objects having strong resonances, and for low-frequency measurements. In these cases, variations in the room geometries have a dominant effect.
Bibliographic Reference: EUR 14360 EN (1992) 403 pp., MF, ECU 20
Record Number: 199210922 / Last updated on: 1994-12-02
Original language: en
Available languages: en