SOUND ABSORPTION OF CORRUGATED CARDBOARD SAMPLES WITH A SIMPLE IMPEDANCE TUBE

Iulian LUPEA

Abstract


The normal sound absorption coefficient of cardboard samples by using the standing wave ratio method is measured. An impedance tube with a simple design is employed. A Labview application is managing the acquisition of sound pressure in tube close to the samples, is processing the data and finally the graph of the normal sound absorbing coefficient versus frequency is shown on the screen. A set of cardboard circular samples are proposed for evaluation. The compact cardboard structure is the material for a set of low absorption samples measured with the simple impedance tube. A second set of corrugated cardboard samples is proposed. The sound absorption for these samples is very good because of the layer of air present in the cardboard structure. The paper is presenting an inexpensive material, offering a good sound absorbing structure for a relative large frequency band for quick usage and the micro-perforations are obtained by drilling.

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References


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