Abstract
With improvements in 3-D resin printing, it is now possible to design and print porous materials for testing in an acoustic impedance tube. The measured impedances of these materials can be compared to theoretical calculations. To do this, physical parameters, such as porosity and flow resistance, must be measured for the printed materials. Procedures for measuring these parameters will be discussed as well as preliminary measurements of the acoustic impedance. To measure flow resistance on the printed samples, a system based on the standard “Acoustics—Determination of airflow resistance Part 1: Static airflow method” (ISO 9053-1:2018) has been built and tested. These results will be compared to estimates of flow resistance through straight, round tubes. Porosity is measured in a simple volume comparison measurement.
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