Abstract
The aim of this work is to compare the accuracy of numerical previsions of sound propagation in a quarry obtained with different algorithms. A comparison is made between the ISO 9613-1/2:1993 (E) standard for outdoor sound propagation, a new simplified algorithm based on the ISO code, a pyramid beam tracing method, and experimental measurements. The ISO 9613 standard proposes a detailed and complex method taking into account air absorption. It also takes into account the effects caused by the propagation over soil with varying properties, shielding both from thin and thick obstacles as well as the effects of vegetation layers and excess attenuation. The new algorithm simplifies ISO codes proposing an easy method, specific for a quarry. Pyramid beam tracing, implemented in Ramsete sound propagation software, is typically used to simulate sound fields in large rooms and also outdoors. Experimental and simulated data were used to built graphic plots, enabling a direct comparison of the results.
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