Models of the Formation of Doppler Spectrum of Surface Reverberation for Sound Waves of the Meter Range

IF 0.9 4区物理与天体物理 Q4 ACOUSTICS

Acoustical Physics Pub Date : 2023-11-16 DOI:10.1134/S1063771023600687

M. B. Salin, A. V. Ermoshkin, D. D. Razumov, B. M. Salin

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Abstract—Narrowband spectra of sound scattered on the surface wave in the frequency range from 500 to 3000 Hz have been analyzed. Experimental results and theoretical models are reviewed. Previously published work by the authors is reviewed and new results are presented. The first characteristic case considered is forward scattering, where the sound transmitter and receiver are substantially separated from each other in space, and a continuous emission of a sinusoidal signal is produced. For this case, it is shown that the modulation spectrum of the scattered signal repeats the frequency spectrum of the surface wave with a certain coefficient and small corrections. The second considered characteristic case is a monostatic location, where the receiver and transmitter are combined and tone-pulse signals are emitted. Previously, for this case, it was implicitly expected that the reverberation spectrum would be generated by Bragg scattering on surface waves corresponding to half of the sound wavelength, and hence the spectrum of the scattered signal would be discrete. However, the experimental results indicate that the monostatic scattering spectra have a smooth bell-shape. Explaining this requires taking the effects of modulation of short surface waves by the long-wave component into account. Additionally, to explain the experimental phenomenon, the authors include a model of sound scattering on air bubbles, which are located in the near-surface layer of water and make oscillatory movements in the field of orbital currents of surface waves.

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米级声波表面混响多普勒频谱形成的模型

摘要:分析了500 ~ 3000 Hz表面波上散射声的窄带频谱。综述了实验结果和理论模型。回顾了作者以前发表的工作，并提出了新的结果。考虑的第一个特征情况是前向散射，其中声音发射器和接收器在空间上基本上彼此分离，并且产生连续发射的正弦信号。在这种情况下，散射信号的调制频谱以一定的系数和较小的修正重复表面波的频谱。第二个考虑的特征情况是单静态位置，其中接收器和发射器组合并且发射音调脉冲信号。之前，对于这种情况，我们隐含地期望混响频谱是由一半声波长对应的表面波上的布拉格散射产生的，因此散射信号的频谱是离散的。然而，实验结果表明，单稳态散射光谱具有光滑的钟形。解释这一点需要考虑到长波分量调制短表面波的影响。此外，为了解释实验现象，作者还建立了气泡声散射模型，气泡位于水的近表层，在表面波的轨道电流场中振荡运动。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Acoustical Physics 物理-声学

CiteScore

1.60

自引率

50.00%

发文量

审稿时长

3.5 months

期刊介绍： Acoustical Physics is an international peer reviewed journal published with the participation of the Russian Academy of Sciences. It covers theoretical and experimental aspects of basic and applied acoustics: classical problems of linear acoustics and wave theory; nonlinear acoustics; physical acoustics; ocean acoustics and hydroacoustics; atmospheric and aeroacoustics; acoustics of structurally inhomogeneous solids; geological acoustics; acoustical ecology, noise and vibration; chamber acoustics, musical acoustics; acoustic signals processing, computer simulations; acoustics of living systems, biomedical acoustics; physical principles of engineering acoustics. The journal publishes critical reviews, original articles, short communications, and letters to the editor. It covers theoretical and experimental aspects of basic and applied acoustics. The journal welcomes manuscripts from all countries in the English or Russian language.