Diffraction of sound pulses on an elastic spherical shell submerged in an oceanic waveguide |
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Authors: | N S Grigorieva G M Fridman |
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Institution: | 1. St. Petersburg State Marine Technical University, ul. Lotsmanskaya 3, St. Petersburg, 190008, Russia 2. St. Petersburg State University of Economics, ul. Sadovaya 21, St. Petersburg, 191023, Russia
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Abstract: | The paper is devoted to simulating an acoustic field scattered by an elastic spherical shell placed in a waveguide with a fluid attenuating bottom. The emitted signal is a wideband pulse with a Gaussian envelope. The normal wave method is used in the frequency domain for calculating the field of a point source in a free waveguide and the shell scattering coefficients. Movement of the receiver along a vertical straight line located behind the shell makes it possible to obtain a “three-dimensional” image of the field scattered by the shell. In this representation, the horizontal axis is time; the vertical axis is the submersion depth of the receiver; the intensity shows the amplitude of the received signal. Such three-dimensional structures make it possible to analyze the dependence of the complex diffraction structure of the acoustic field on receiver depth. In the considered numerical example, a thin, elastic, spherical shell is located near the attenuating fluid bottom. |
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