most common acoustic absorbers) when predicting normal incidence absorption. The model is accurate for high porosity materials (i.e. ZORBA gives a choice of different models but by default uses Allard and Champoux’s model (JASA Vol 91 1992) which is the most accurate simple model currently available for predicting absorption. Various models for predicting absorption have been developed over the years. The flow resistivity is a measure of the resistance to steady airflow and can be readily measured (ASTM C522) or for many materials can be estimated from the density and fiber diameter. The properties can be predicted by knowing the flow resistivity of the material and its thickness and the dimensions of the slots or perforations.
The effect of perforated or slatted coverings can be predicted as can that of panel absorbers. ZORBA is a Windows based computer program for predicting the sound absorption of common acoustic materials such as fiberglass, mineral wool or polyester.
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