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首页> 外文期刊>Applied Acoustics >Patch nearfield acoustic holography in a moving medium
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Patch nearfield acoustic holography in a moving medium

机译：在移动介质中修补近场声全息

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摘要

To realize the accurate reconstruction of sound field in a moving medium under the condition of limited holographic aperture, a patch nearfield acoustic holography (NAH) in a moving medium is proposed. The proposed method not only reduces the influence caused by the limited aperture effects through sound field extrapolation, but also perfectly suits for sound field reconstruction in a moving medium by improving the shape of the modified Tikhonov regularization filter and the noise estimation method in accordance with flow effects. In the method, two cases that the flow direction is parallel to and perpendicular to the hologram surface are considered. Especially in the perpendicular case, the expression of the wavenumber component in the z direction is improved to make the proposed method suitable for the moving medium at a high Mach number. Simulations are investigated to examine the performance of the proposed method and show its advantages by comparing with NAH in a moving medium and the conventional patch NAH. It is found that, the proposed method is effective and robust at different flow velocities of the medium and different frequencies of the sound source.
机译：为了在全息孔径受限的情况下实现运动介质中声场的准确重构，提出了一种运动介质中的斑块近场声全息技术。所提出的方法不仅通过声场外推减少了有限的孔径效应所造成的影响，而且通过改进改进的Tikhonov正则化滤波器的形状和根据流量的噪声估计方法，完全适合于在移动介质中进行声场重构。效果。在该方法中，考虑了流动方向平行于且垂直于全息图表面的两种情况。特别是在垂直情况下，改进了z方向上波数分量的表达式，使所提出的方法适用于高马赫数的运动介质。通过仿真研究了该方法的性能，并通过与运动介质中的NAH和常规贴片NAH进行比较，显示了其优势。结果表明，该方法在介质的不同流速和声源的不同频率下均有效且鲁棒。

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  • 来源
    《Applied Acoustics》 |2014年第12期|71-79|共9页
  • 作者

    Bi-Chun Dong; Chuan-Xing Bi; Xiao-Zheng Zhang; Yong-Bin Zhang;

  • 作者单位

    Institute of Sound and Vibration Research, Hefei University of Technology, 193 Tunxi Road, Hefei 230009, People's Republic of China;

    Institute of Sound and Vibration Research, Hefei University of Technology, 193 Tunxi Road, Hefei 230009, People's Republic of China;

    Institute of Sound and Vibration Research, Hefei University of Technology, 193 Tunxi Road, Hefei 230009, People's Republic of China;

    Institute of Sound and Vibration Research, Hefei University of Technology, 193 Tunxi Road, Hefei 230009, People's Republic of China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Patch nearfield acoustic holography; Moving medium; Sound field extrapolation; Flow effects;

    机译：修补近场声全息;移动介质;声场外推;流效应;

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