Abstract
A nomograph for the prediction of excess sound attenuation over barriers of building size is presented. The nomograph is based on the results of acoustic scale model experiments carried out using techniques and equipment developed by Lyon [Lyon and Cann, “Acoustical Modeling in Urban Environments,” Inter-Noise '74 Proc. 457 (1974)]. A scale factor of 64:1 was employed with barrier width to height ratios ranging from 0.0 to 5.0. Measurements were made in the free field and with the barrier on both reflective and absorptive surfaces. Results indicate a dependence on type of ground surface, with the excess attenuation increasing more for a given increase in building width on the reflective surface than on the absorptive surface. Attenuation due to the diffraction of sound around the edge of a building is also briefly discussed.
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