Archives of Acoustics, 45, 4, pp. 747–752, 2020
10.24425/aoa.2020.135280

High-Directional Sound Propagation Over the Earth’s Surface

Denis Sergeevich RAKOV
1. National Research Tomsk Polytechnic University 2. Institute of Monitoring of Climatic and Ecological Systems of the Siberian Branch of the Russian Academy of Sciences
Russian Federation

Aleksandr S. RAKOV
Institute of Monitoring of Climatic and Ecological Systems of the Siberian Branch of the Russian Academy of Sciences
Russian Federation

Yury A. CHURSIN
National Research Tomsk Polytechnic University
Russian Federation

Vsevolod V. PAVLICHEV
National Research Tomsk Polytechnic University
Russian Federation

Artyom O. IGUMNOV
National Research Tomsk Polytechnic University
Russian Federation

The article discusses the issues of accounting the direction pattern of parametric antenna array the propagation of sound over the Earth’s surface. As a radiator, a parametric antenna array is used. A description is given of measuring equipment and experimental research methods. The Delaney-Bezley model was used as a model of the Earth’s surface impedance. The research results showed the importance of accounting the direction pattern of parametric antenna array in predicting the sound pressure level of a propagating acoustic signal over the Earth’s surface. On the example of a difference signal with a frequency of 2 kHz, the calculation of the sound pressure level on a 100-meter path with the influence of the Earth’s surface is shown. The results obtained showed a good agreement between the theoretical calculation and experimental data.
Keywords: parametric loudspeaker; ultrasound; primary frequency; difference frequency; radiation pattern; outdoor propagation of sound; sound attenuation
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DOI: 10.24425/aoa.2020.135280

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