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Patch nearfield acoustic holography combined with sound field separation technique applied to a non-free field

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  • Acoustics
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Abstract

The conventional nearfield acoustic holography (NAH) is usually based on the assumption of free-field conditions, and it also requires that the measurement aperture should be larger than the actual source. This paper is to focus on the problem that neither of the above-mentioned requirements can be met, and to examine the feasibility of reconstructing the sound field radiated by partial source, based on double-layer pressure measurements made in a non-free field by using patch NAH combined with sound field separation technique. And also, the sensitivity of the reconstructed result to the measurement error is analyzed in detail. Two experiments involving two speakers in an exterior space and one speaker inside a car cabin are presented. The experimental results demonstrate that the patch NAH based on single-layer pressure measurement cannot obtain a satisfied result due to the influences of disturbing sources and reflections, while the patch NAH based on double-layer pressure measurements can successfully remove these influences and reconstruct the patch sound field effectively.

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Authors and Affiliations

  1. Institute of Sound and Vibration Research, Hefei University of Technology, Hefei, 230009, China

    ChuanXing Bi, WenQian Jing, YongBin Zhang & Liang Xu

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  1. ChuanXing Bi
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  2. WenQian Jing
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  3. YongBin Zhang
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  4. Liang Xu
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Correspondence to ChuanXing Bi.

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Bi, C., Jing, W., Zhang, Y. et al. Patch nearfield acoustic holography combined with sound field separation technique applied to a non-free field. Sci. China Phys. Mech. Astron. 58, 1–9 (2015). https://doi.org/10.1007/s11433-014-5467-4

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  • DOI: https://doi.org/10.1007/s11433-014-5467-4

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