Abstract
The influence of mounting conditions on the measurement of the absorption coefficient is investigated. More specifically, the effects of circumferential air gaps on poroelastic materials inside the standing wave tube are studied. The objective is to identify the materials, in terms of a ratio based on their physical properties, for which it is possible to measure the theoretical absorption coefficient using the tube. The difference, or error, between the measured and theoretical absorption coefficient is evaluated for a wide range of materials with various sample sizes. These errors are then sorted in terms of the chosen ratio. It is shown that for certain values of the ratio, the theoretical absorption coefficient can be efficiently measured using the standing wave tube. Through the use of this acousto-visco-inertial criteria, an experimenter can determine which absorption is going to be measured: the theoretical absorption coefficient or one that will be influenced by either the circumferential air gaps or the size of the sample.
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