Title: Comparing the sound absorption of different objects
Abstract: Current methods of measuring sound absorption involve a piece of material. Small pieces are tested in impedance tubes. Larger pieces are tested in a reverberation room, using the reverberation-time decay method, as in ISO Standard 354. However these procedures do not determine the absorption of a complete object. It is proposed to determine the absorption of an object by measuring the negative sound power of the object in a reverberation room using sound intensity. It has been shown that sound power using sound intensity can be measured accurately in reverberation rooms (R. Hickling, Proceedings NOISE-CON 97, pages 483-488). Negative sound power on its own, however, cannot provide a satisfactory comparison indicator between objects because it depends on the room. It is necessary, therefore, to develop a normalization procedure to make the negative sound-power measurement independent of the room. A procedure is described which was tested for the same object (a car seat) in two different reverberation rooms. The results are encouraging. It is planned to conduct further tests using a variety of objects in different rooms to check the validity of the normalization procedure.
Publication Year: 2008
Publication Date: 2008-05-01
Language: en
Type: article
Indexed In: ['crossref']
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