Fundamental Cases of Urban Acoustics and Their Interaction with Propagating Sound: Phase II
Final rept. Feb-Nov 2009
ARMY RESEARCH LAB ADELPHI MD COMPUTATIONAL AND INFORMATION SCIENCES DIRECTORATE
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An ongoing U.S. Army Research Laboratory ARL effort to study fundamental cases of urban acoustics with the goal of enhanced prediction capabilities found that, in Phase I of the study, a single-story isolated building can be adequately described, in some instances, as a wide barrier of finite length. The structure investigated during Phase I was a small, architecturally simple, gabled-roofed building typical of suburban and rural residential housing. To expand upon the first phase, Phase II investigates a large, semi-isolated, multi-faceted building of cinder block construction typical to urban areas. Comparisons between the experimental results of the second phase and the models used in describing the first phase reveal that the interaction of propagating sound with the geometrical complexity of the Phase II structure cannot be successfully described using diffraction models commonly used with sound propagation over barriers.