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EMD-based extraction of modulated cavitation noise

机译:基于EMD的调制空化噪声提取

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摘要

The empirical mode decomposition (EMD) is applied to extract information of modulation from signals contaminated by noise. The EMD method is capable of recovering the amplitude-modulated components from strong background noise in an adaptive way, and achieves better performance than traditional methods. We further propose a modified EMD technique by estimating the local mean of a signal via windowed average. This method alleviates the unfavorable influence of noise disturbance effectively in the process of sifting and yields a remarkable improvement for the modulation extraction. Finally, by utilizing this novel technique, we achieve the adaptive and effective extraction of the modulated cavitation noise from ship-radiated noise.
机译:经验模态分解(EMD)用于从受噪声污染的信号中提取调制信息。 EMD方法能够以自适应方式从强背景噪声中恢复调幅分量,并且比传统方法具有更好的性能。通过通过开窗平均估计信号的局部均值,我们进一步提出了一种改进的EMD技术。该方法有效地减轻了噪声干扰在筛选过程中的不利影响,对调制提取产生了明显的改善。最后,通过使用这种新技术,我们实现了从舰船辐射噪声中自适应,有效地提取调制空化噪声。

著录项

  • 来源
    《Mechanical systems and signal processing》 |2010年第7期|P.2124-2136|共13页
  • 作者单位

    Key laboratory of Acoustics and Institute of Acoustics, Nanjing University, Nanjing 210093, China;

    rnKey laboratory of Acoustics and Institute of Acoustics, Nanjing University, Nanjing 210093, China;

    rnKey laboratory of Acoustics and Institute of Acoustics, Nanjing University, Nanjing 210093, China;

    rnState Key Laboratory of Ocean Acoustics, Hangzhou Applied Acoustics Research Institute, Hangzhou 310012, China;

    rnState Key Laboratory of Ocean Acoustics, Hangzhou Applied Acoustics Research Institute, Hangzhou 310012, China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    EMD; IMF; the modified EMD; modulation analysis;

    机译:EMD;国际货币基金组织;修改后的EMD;调制分析;

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