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Near-field acoustic holography of cyclostationary sound fields
The Journal of the Acoustical Society of America, 2012The radiated sound field of rotating machinery or reciprocating machinery has a significant periodically time-variant nature. This is a kind of non-stationary sound field and called cyclostationary sound field. In the conventional planar near-field acoustic holography(PNAH), this kind of sound field is treated as stationary field, so the information ...
Zhimin Chen, Hongchun Chen, Haichao Zhu
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Near-field acoustic holography for underwater moving surfaces
The Journal of the Acoustical Society of America, 2023Near-field acoustic holography has been the standard technique to accurately image static structure vibration from nearby acoustic pressure measurements. The classical application bases the method on the stable solution of an integral surface representation of the acoustic pressure.
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An application of the neural network in the near-field acoustic holography
International Technology and Innovation Conference 2006 (ITIC 2006), 2006The near-field acoustic holography (NAH) is an effective and useful noise measurement method. There are many methods for reconstruction of the sound source, but the measurement circumstance is limited and the random noise is unavoidable. In this paper, a new holography reconstruction method based on neural network (NN) is proposed, which can identify ...
null Gao Yinhan +3 more
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Wrapping a violin with planar near-field acoustic holography.
The Journal of the Acoustical Society of America, 1996Planar near-field acoustic holography gives one the ability to reconstruct the sound pressure radiated from a source in a three-dimensional field from a single two-dimensional near-field measurement. Traditionally, only one measurement plane has been used which gives the sound radiation in a half-space. In this paper, the near-field acoustic holography
Lily M. Wang, Courtney B. Burroughs
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Progress of the Patch Near-Field Acoustical Holography Technique
Acta Acustica united with Acustica, 2008The development of patch near-field acoustic holography (Patch-NAH) has been rapid in recent years. Compared to the traditional NAH techniques, the Patch-NAH method possesses the advantage of solving engineering problems, and is especially suitable for reconstructing partial sound fields and for obtaining other acoustic parameters.
Chao Yang +3 more
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Near-field acoustic holography measurements of the acoustic radiation from violins
The Journal of the Acoustical Society of America, 1996As previously described, an open-frame mechanical bowing apparatus has been constructed to excite a violin [L. M. Wang and C. B. Burroughs, J. Acoust. Soc. Am. 99, 2502(A) (1996)]. An array of microphones is mounted to this apparatus on each of the six sides of the frame, boxing the violin source. Complex pressure measurements made in the near field of
Lily M. Wang, Courtney B. Burroughs
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Near-Field Acoustic Holography of Cyclostationary Sound Field
Advanced Materials Research, 2013The radiated sound field of rotating machinery or reciprocating machinery has a significant periodically time-variant nature. This is a kind of non-stationary sound field and called cyclostationary sound field. In the conventional planar near-field acoustic holography(PNAH), this kind of sound field is treated as stationary field, so the information ...
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Near-field acoustic holography for acoustic noise source identification in turbomachinery
2009 IEEE Sensors Applications Symposium, 2009A novel approach using basis expansions of acoustic sources is proposed to better condition the inverse problem in NAH. Results indicate that the basis expansion representation of sources provides better source reconstruction results through effectively combating ill-posedness of the inverse problem.
Tariq Khan +3 more
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New developments in near-field acoustic holography
2007In the field of noise-control engineering, information about the individual strength, andlocation, of the most dominant sources is of vital importance. This information allows theacoustic engineer to take effective measures in his effort to reduce the emitted acoustic noiselevels.
Roozen, N.B. +3 more
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Surface decomposition method for near-field acoustic holography.
The Journal of the Acoustical Society of America, 2011Near-field acoustic holography reconstruction of the acoustic field at the surface of an arbitrarily shaped radiating structure from pressure measurements at a nearby conformal surface is obtained from the solution of a boundary integral equation. This integral equation is discretized using the equivalent source method to be transformed into a matrix ...
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