Abstract
This paper presents the results of an investigation into the acoustic impedance characteristics of porous materials such as porous foams and fibrous mats. Most of previous experimental investigations focused on the characteristics of fibrous materials only. However, Yu, Kwan and Yasukawa did include some foam materials in th eir investigation. Their experiments were conducted in an impedance tube, which allowed measurement up to 6000 Hz. The empirical correlations of Delany and Bazley were derived from measurements conducted between 250 and 4000 Hz. The data presented by Lee a nd Selamet 4 had an upper limit of just over 3000 Hz. The apparatus developed by Syed and Ichihashi at the University of Cincinnati is capable of accurate measurements up to 9000 Hz. Therefore it allows an investigation of the acoustic characteristics of p orous materials over a much wider frequency range.
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