Experimental Evaluation of the Acoustic Impedance of Different Ground Types by Sound Propagation in Open-Air Environments

Abstract:

This work presents an experimental characterization of three types of ground commonly found in urban centers regarding their absorption properties with respect to sound propagation: asphalt, grassland and soil. A brief theoretical background is presented, and the experimental procedure is discussed in detail. With basis on experimental results, it is concluded that grassland ground is mostly absorbent for all tested frequencies, whereas asphalt and soil are reflexive for low frequencies and absorbent for high ones.

• Periodical: Advanced Materials Research (Volume 902)
• Pages: 185-191
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.902.185
• Online since: February 2014
• Authors: Rafael A. C. Laranja*, Vander M. Budel, Heraldo J. Amorim, Mario R. Sobczyk S.
• Keywords: Acoustic Impedance, Ground Acoustic Properties, Sound Flow Resistivity, Sound Measurement in Open Air

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