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Numerical simulations of shockless nonlinear acoustic noise in one dimension

机译:一维无震非线性声学噪声的数值模拟

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摘要

The attenuation of a monochromatic signal in the presence of discrete noise in one dimension is investigated numerically. The predicted Gaussian attenuation is verified by the numerical program, which is based on Riemann's implicit solution of the exact equation for the unidirectional propagation of shockless sound. Two new results are also presented. In the first, the transition from Gaussian to Bessel dependence as a function of resolution in the detection of a signal is observed. This results shows that the fundamental property of time reversibility can only be established if the overall system of the waves and the observer is considered. In the second result, the evolution of the amplitude of a signal injected downstream from the noise is investigated. The Gaussian attenuation is also observed in this case. This result explicitly shows that the attenuation length depends on the distance the signal has traveled, thus displaying memory and breakdown of translational invariance.
机译:数值研究了存在一维离散噪声时单色信号的衰减。数值程序验证了预测的高斯衰减,该程序基于黎曼对无冲击声的单向传播的精确方程式的隐式解。还提出了两个新结果。首先,观察到在信号检测中从高斯到贝塞尔依赖关系的转换与分辨率的关系。结果表明,只有考虑波浪和观测器的整体系统,才能建立时间可逆性的基本属性。在第二个结果中,研究了从噪声下游注入的信号幅度的演变。在这种情况下,也会观察到高斯衰减。该结果明确表明,衰减长度取决于信号传播的距离,从而显示记忆和平移不变性的分解。

著录项

  • 作者

    Jang Hyeon Joo;

  • 作者单位
  • 年度 1996
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  • 原文格式 PDF
  • 正文语种 en_US
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