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The incoherent sound field obtained by scanning measurement cannot be used directly for nearfield acoustic holography to reconstruct the sound field. And therefore, the incoherent sound field needs to be decomposed into fully coherent partial fields. In previous methods, the pressure is used as reference to obtain the partial fields. In this paper, the pressure gradient is used as the reference for the partial field decomposition. Because the pressure gradient decays faster than the pressure, the interaction of the pressure gradient between the incoherent sources is weaker than that of the pressure, which may improve the effect of the partial field decomposition. A numerical simulation and an experiment are conducted to test the feasibility of the method. And it is shown that the partial field decomposition method based on pressure gradient reference is robust and the decomposed results are better than those based on pressure references.
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Keywords:
- incoherent sound field /
- nearfield acoustic holography /
- pressure gradient /
- partial field decomposition
[1] Williams E G, Maynard J D, Skudrzyk E J 1980 J. Acoust. Soc. Am. 68 340
[2] Maynard J D, Williams E G, Lee Y 1985 J. Acoust. Soc. Am. 78 1395
[3] Bi C X, Zhang Y B, Xu L, Chen X Z 2010 Acta Phys. Sin. 59 1108 (in Chinese) [毕传兴, 张永斌, 徐亮, 陈心昭 2010 59 1108]
[4] Zhang H B, Jiang W K, Wan Q 2008 Acta Phys. Sin. 57 313 (in Chinese) [张海滨, 蒋伟康, 万泉 2008 57 313]
[5] Hald J 1989 B&K technical review 1 1
[6] Hallman D, Bolton J S 1992 Proc. Inter-noise 92 p1165
[7] Bendat J S, Piersol A G 2000 Random Data: Analysis and Measurement Procedures (3rd Ed.) (New York: Wiley) p218
[8] Tomlinson M A 1999 Applied Acoustics 57 243
[9] Nam K U, Kim Y H 2001 J. Acoust. Soc. Am. 109 1808
[10] Nam K U, Kim Y H 2004 J. Acoust. Soc. Am. 116 172
[11] Kwon H S, Kim Y J, Bolton J S 2003 J. Acoust. Soc. Am. 113 360
[12] Lee M, Bolton J S, Mongeau L 2003 J. Acoust. Soc. Am. 114 842
[13] Kim Y J, Bolton J S, Kwon H S 2004 J. Acoust. Soc. Am. 115 1641
[14] Lee M, Bolton J S 2006 J. Acoust. Soc. Am. 119 382
[15] Kang Y J, Hwang E S 2008 J. Sound. Vib. 314 867
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[1] Williams E G, Maynard J D, Skudrzyk E J 1980 J. Acoust. Soc. Am. 68 340
[2] Maynard J D, Williams E G, Lee Y 1985 J. Acoust. Soc. Am. 78 1395
[3] Bi C X, Zhang Y B, Xu L, Chen X Z 2010 Acta Phys. Sin. 59 1108 (in Chinese) [毕传兴, 张永斌, 徐亮, 陈心昭 2010 59 1108]
[4] Zhang H B, Jiang W K, Wan Q 2008 Acta Phys. Sin. 57 313 (in Chinese) [张海滨, 蒋伟康, 万泉 2008 57 313]
[5] Hald J 1989 B&K technical review 1 1
[6] Hallman D, Bolton J S 1992 Proc. Inter-noise 92 p1165
[7] Bendat J S, Piersol A G 2000 Random Data: Analysis and Measurement Procedures (3rd Ed.) (New York: Wiley) p218
[8] Tomlinson M A 1999 Applied Acoustics 57 243
[9] Nam K U, Kim Y H 2001 J. Acoust. Soc. Am. 109 1808
[10] Nam K U, Kim Y H 2004 J. Acoust. Soc. Am. 116 172
[11] Kwon H S, Kim Y J, Bolton J S 2003 J. Acoust. Soc. Am. 113 360
[12] Lee M, Bolton J S, Mongeau L 2003 J. Acoust. Soc. Am. 114 842
[13] Kim Y J, Bolton J S, Kwon H S 2004 J. Acoust. Soc. Am. 115 1641
[14] Lee M, Bolton J S 2006 J. Acoust. Soc. Am. 119 382
[15] Kang Y J, Hwang E S 2008 J. Sound. Vib. 314 867
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