Results 161 to 170 of about 1,225 (190)
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A comparison of SONAH and IBEM for near-field acoustic holography
The Journal of the Acoustical Society of America, 2008Among the popular techniques for acoustic source identification in complex environments are the Statistically Optimal Near Acoustic Holography (SONAH) and the Inverse Boundary Element Method (IBEM). These two methods are quite different regarding the underlying assumptions and the practical implementations: Whereas SONAH performs the back-propagation ...
Peter Juhl, Jesper Gomes
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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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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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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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Measurement of Structural and Acoustic Intensities Using Near-Field Acoustical Holography
Japanese Journal of Applied Physics, 1996A non contacting method for measuring structural and acoustic intensities is proposed by developing the signal processing in near-field acoustical holography (NAH). The effectiveness of this method is illustrated by applying it to the measurement of radiation from ribbed and unribbed submerged plates. The spatial derivatives for determining
Kenji Saijyou Kenji Saijyou +1 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 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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APPLIED ASPECTS OF NEAR-FIELD ACOUSTIC HOLOGRAPHY
Transactions of Kremenchuk Mykhailo Ostrohradskyi National University, 2023Yevhenii Ponomarenko, Kyrylo Trapezon
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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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