The effect of realistic ground impedance on the accuracy of ray tracing

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Journal titleJournal Of The Acoustical Society Of America
Pages154158; # of pages: 5
AbstractThe heuristic model of sound propagation in the atmosphere has been developed by L'Espérance et al. [Appl. Acoust. 37, 111舑139 (1992)] to provide rapid calculation of sound-pressure levels. This model uses an analytic ray trace method to calculate ray paths from the source to the receiver. The effects of finite ground impedance are treated by calculating the spherical wave reflection factor as if the atmosphere was homogeneous. The actual reflection angles and times of flight are used in this formulation. Since the speed of sound varies linearly with height, no focusing factors are calculated. The heuristic model has been compared to full wave calculations and is found to agree well at long ranges. In this paper the agreement between the heuristic model and the fast field program is investigated in detail. Criteria for the accuracy of ray tracing are discussed. It is demonstrated that the heuristic model produces realistic predictions even though certain criteria are violated. The finite ground impedance is shown to remove those rays for which the ray tracing criteria do not hold.
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AffiliationNational Research Council Canada; NRC Institute for Microstructural Sciences
Peer reviewedNo
NPARC number12327516
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Record identifier29262bea-7e19-4248-b5c1-b2883b65ccfd
Record created2009-09-10
Record modified2016-05-09
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