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TECHNICAL PAPERS

Near Field Acoustic Holography for Cyclostationary Sound Field and its Partial Source Decomposition Procedure

[+] Author and Article Information
Quan Wan1

State Key Laboratory of Vibration, Shock and Noise, Shanghai Jiaotong University, Shanghai 200240wanquan001@sjtu.edu.cn

W. K. Jiang

State Key Laboratory of Vibration, Shock and Noise, Shanghai Jiaotong University, Shanghai 200240

1

Corresponding author. Tel: 0086-21-54747441-212; Fax: 0086-21-54747451.

J. Vib. Acoust 127(6), 542-546 (Feb 23, 2005) (5 pages) doi:10.1115/1.2110820 History: Received March 20, 2004; Revised February 23, 2005

The cyclostationary near field acoustic holography (NAH) technique is proposed to overcome the limitations of the current NAH in analyzing cyclostationary sound field. The proposed technique adopts the cyclic spectrum density as the reconstructed physical quantity, instead of the spectrum of sound pressure. Moreover, introducing the principal component analysis into the technique, a partial source decomposition procedure is suggested to decompose the sound field radiated by multiple sound sources into some incoherent partial fields. More information about cyclostationary sound field can be shown clearly on the hologram of the proposed technique than NAH can, which is validated by the simulation results.

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Copyright © 2005 by American Society of Mechanical Engineers
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Figures

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Figure 1

The sketch map of sound field reconstruction from the hologram plane Sh to the hologram plane Ss

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Figure 2

The PSD of modulating components of the unity velocity signal on the surface of source Ω1, which is a rigid square piston in an infinite baffle

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Figure 3

The PSD of the unity velocity signal on the surface of source Ω1

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Figure 4

The CSD of the unity velocity signal on the surface of source Ω1 when α=600Hz

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Figure 5

The PSD of the sound pressure signal radiated from the source Ω1

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Figure 6

The CSD of the sound pressure signal radiated from the source Ω1 when α=600Hz

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Figure 7

The coherence function of two weakly coherent references

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Figure 8

The decomposed partial sound field radiated from the source Ω1 on the reconstructed plane zs=0 when f=120Hz, α=600Hz, and weakly coherent references

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Figure 9

The decomposed partial sound field radiated from the source Ω2 on the reconstructed plane zs=0 when f=120Hz, α=600Hz, and weakly coherent references

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Figure 10

The actual sound field on the reconstructed plane zs=0 radiated from the sources Ω1 and Ω2 when f=120Hz, α=600Hz

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Figure 11

The coherence function of two strongly coherent references

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Figure 12

The decomposed partial sound field radiated from the source Ω1 on the reconstructed plane zs=0 when f=120Hz, α=600Hz, and strongly coherent references

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Figure 13

The decomposed partial sound field radiated from the source Ω2 on the reconstructed plane zs=0 when f=120Hz, α=600Hz, and strongly coherent references

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