Results 31 to 40 of about 1,225 (190)

A New Method for Determining Optimal Regularization Parameter in Near-Field Acoustic Holography

Shock and Vibration, 2018
Tikhonov regularization method is effective in stabilizing reconstruction process of the near-field acoustic holography (NAH) based on the equivalent source method (ESM), and the selection of the optimal regularization parameter is a key problem that ...
Yue Xiao
doaj   +1 more source

[Grant application] Near-field Acoustical Holography - a new sensor concept for methods of active noise reduction [PDF]

Anlage A: 'Beschreibung des Vorhabens' zum Forschungsantrag an die Deutsche Forschungsgemeinschaft (DFG)The research hypothesis of the project comprises the development process of a sensor principle based on near-field acoustical holography for active ...
Ungnad, Steffen
core   +1 more source

Acousto-optic sensing for near-field acoustic holography [PDF]

, 2022
Near-field acoustic holography (NAH) is a very powerful and widely used technique for the study of complex acoustic radiators. NAH enables to quickly understand how a complex source radiates into the medium.
Riezu, Samuel Arturo Verburg, Grande, Efren Fernandez, Williams, Earl G.   +2 more
core  

Preservation and Visualization of Sound Heritage: Case Study of the Sacred Bell of King Seongdeok [PDF]

The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences
In this study, a sound source modelling method using near-field acoustic holography was proposed as a method to preserve the acoustic radiation characteristics of acoustic heritage, and a series of processes to archive and reproduce the radiation ...
W.-H. Cho, I.-J. Jung, J.-H. Woo, B.-K. Kim, J.-G. Ih   +4 more
doaj   +1 more source

A Forward−Backward Splitting Equivalent Source Method Based on S−Difference

Applied Sciences
The regularization method has a direct impact on the accuracy of the reconstructed sound field in the process of inverse calculation of near−field acoustic holography using the equivalent source method.
Jin Mao, Zeyu Wang, Jiang Liu, Danlong Song   +3 more
doaj   +1 more source

A New Approach for Acoustic Field Interpolation

Cybernetics and Information Technologies, 2016
The present paper describes the basic performance of the 18 microphone acoustic camera manufactured by Brüel & Kjær for acoustic field reconstruction. The new approach for acoustic field interpolation is proposed and investigated.
Chyrka Iu. D.
doaj   +1 more source

Direct extrapolation in near‐field acoustic holography

Electronics Letters, 2015
The size and shape of a reconstruction surface is the same as a holography surface in conventional near‐field acoustic holography (NAH), which limits the size and shape of the measurement surface. To reduce the measurement points and use any shape of measurement array, the direct extrapolation in NAH based on wave superposition is proposed.
Jin Mao, Zhongming Xu, Si Chen, Shu Li, Yansong He   +4 more
openaire   +1 more source

Super‐Resolution and High‐Data‐Density Acoustic Meta‐Hologram via Amplitude and Phase Coupling

Advanced Science, EarlyView.
A super‐resolution acoustic meta‐hologram utilizes amplitude‐phase coupling under energy conservation constraints to overcome the traditional diffraction limit. This conceptually advanced approach achieves high‐fidelity acoustic field reconstruction and dense information transmission, unlocking new potentials for high‐resolution acoustic imaging and ...
Xiao Guo, Xinzong Wang, Guoshen Tang, Haohan Zeng, Siqi Fan, Xinghao Hu, Youyu Mo, Zhenyu He, Tingting Li, Hui Xu, Jiao Shen, Haiyan Fan, Xiaoxiang Gao, Yifan Zhu, Hui Zhang, Badreddine Assouar   +15 more
wiley   +1 more source

Nearfield Acoustical Holography Research & Application On Compressor & Refrigerator [PDF]

, 2012
In this paper, an algebraic formulation which expresses the dimensionless rate of entropy generation as a function of the heat exchanger geometry (number of transfer units), the thermal-hydraulic characteristics (friction factor and Colburn j-factor ...
Jianwen, Xu, Fagotti, Fabian, Jiang, Weikang   +2 more
core   +1 more source

Spherical wave expansion coefficients for radiation from a planar velocity source [PDF]

JASA Express Letters
A general theory for obtaining spherical wave function expansion coefficients for a sound beam transmitted by a planar velocity source is presented. By neglecting evanescent wave components and thus making the proposed method only approximate in the near
Blake E. Simon, Mark F. Hamilton
doaj   +1 more source