Abstract
When predicting sound fields in rooms such as industrial workrooms, a major factor that must be taken into consideration is the presence of ‘fittings’ — obstacles such as machines, work-benches and stockpiles—in the room. Besides the fitting spatial distribution, there are two important parameters used in prediction models to describe the fittings. One is the fitting density — a measure of the number of fittings and of the average fitting scattering cross-sectional area; the other is the fitting absorption coefficient. While ranges of typical fitting densities and absorption coefficients are known, no reliable method exists for measuring or estimating them in a given case. Furthermore, theoretical expressions for calculating fitting density assume small fittings and high frequency. The aim of this research was to develop and test new, improved methods for determining the fitting density in industrial workrooms. To achieve this objective a correction formula was derived for calculating the fitting density in the case of large fitting dimension. The variable of fitting density with frequency was found from sound-propagation measurements in large fitted regions. A formula to express the relationship was determined by statistical methods. This model was validated experimentally in a scale-model workroom and in a machine shop, with the help of a ray-tracing prediction model.
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