| DOI | Resolve DOI: https://doi.org/10.1121/1.412333 |
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| Author | Search for: Raspet, Richard; Search for: L'Esperance, Andre; Search for: Daigle, Gilles A.1 |
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| Affiliation | - National Research Council of Canada. NRC Institute for Microstructural Sciences
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| Format | Text, Article |
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| Subject | acoustic impedance; earth atmosphere; ray tracing; sound waves; wave propagation |
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| Abstract | The heuristic model of sound propagation in the atmosphere has been developed by L'Espérance et al. [Appl. Acoust. 37, 111-139 (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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| Publication date | 1995-01 |
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| Publisher | AIP |
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| In | |
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| Language | English |
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| Peer reviewed | Yes |
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| NPARC number | 12327516 |
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| Export citation | Export as RIS |
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| Report a correction | Report a correction (opens in a new tab) |
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| Record identifier | 29262bea-7e19-4248-b5c1-b2883b65ccfd |
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| Record created | 2009-09-10 |
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| Record modified | 2020-04-29 |
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