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High-Directional Sound Propagation Over the Earth’s Surface

Rakov Denis S., Rakov Aleksandr S., Chursin Yury A., Pavlichev Vsevolod V., Igumnov Artyom O.

Archives of Acoustics

2020

Vol. 45, No. 4

747--752

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.

A Study of Directional Patterns of Ultrasonic Parametric Array

Rakov Denis S., Rakov Aleksandr S., Kudryavtsev Andrey N., Krasnenko Nikolay P., Chursin Yury A., Murin Maksim A.

Archives of Acoustics

2019

Vol. 44, No. 2

301--307

The paper presents results of numerical calculations and experimental data on the directional pattern of two 38-element parametric arrays composed of ultrasound sources. Two types of antenna arrays are considered, namely with parallel and coaxial connections of ultrasonic transducers (elements). The results of selecting and functional testing of unit elements are described in this paper. It is found that in the coaxial element connection of the antenna array, the level of side lobes is higher than that in the paralel element connection.