脉冲声信号在强非线性传播机制中的解调

IF 0.9 4区 物理与天体物理 Q4 ACOUSTICS
A. V. Kvashennikova, M. S. Sergeeva, P. V. Yuldashev, I. B. Esipov, V. A. Khokhlova
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引用次数: 0

摘要

本文研究了高频脉冲初始激励能在波廓线中形成激波锋面时低频辐射参数产生的一维非线性问题。提出了一种利用godunov型激波捕获格式在时域上求解Burgers方程的数值算法。考虑了不同包络形状的模型调频信号在不同比例的非线性和耗散效应下的传播,这些效应限制了泵浦波的相互作用长度。给出了高频泵信号自解调过程中波形和频谱演变的例子,由于激波锋面波能量的额外衰减,自解调在较短的距离内表现为强非线性传播机制。结果表明,在激波传播条件下,低频产生效率提高。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Demodulation of Pulsed Acoustic Signals in Strongly Nonlinear Propagation Regimes

Demodulation of Pulsed Acoustic Signals in Strongly Nonlinear Propagation Regimes

A one-dimensional nonlinear problem of parametric generation of low-frequency radiation is considered in the case of a pulsed high-frequency initial excitation capable of forming shock fronts in the wave profile. A numerical algorithm for solving the Burgers equation in the time domain using a Godunov-type shock-capturing scheme is developed. Examples of the propagation of model frequency-modulated signals with different envelope shapes at different ratios of nonlinear and dissipative effects, which limit the interaction length of pump waves, are considered. Examples of the evolution of waveforms and spectra in a process of self-demodulation of a high-frequency pump signal are given, with self-demodulation manifesting at shorter distances in strongly nonlinear propagation regimes due to additional attenuation of wave energy at shock fronts. It is shown that the efficiency of low-frequency generation increases in shockwave propagation regimes.

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来源期刊
Acoustical Physics
Acoustical Physics 物理-声学
CiteScore
1.60
自引率
50.00%
发文量
58
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.
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