Near field acoustic holography with particle velocity transducers [PDF]
The Journal of the Acoustical Society of America, 2005 Near field acoustic holography is usually based on measurement of the pressure. This paper describes an investigation of an alternative technique that involves measuring the normal component of the acoustic particle velocity. A simulation study shows that there is no appreciable difference between the quality of predictions of the pressure based on ...
Jacobsen, Finn, Liu, Yang
exaly +6 more sources
Conical Statistical Optimal Near-Field Acoustic Holography with Combined Regularization [PDF]
Sensors, 2021 For the sound field reconstruction of large conical surfaces, current statistical optimal near-field acoustic holography (SONAH) methods have relatively poor applicability and low accuracy.
Wei Cheng +6 more
doaj +2 more sources
On Data Selection and Regularization for Underdetermined Vibro-Acoustic Source Identification [PDF]
SensorsThe number of hologram points in near-field acoustical holography (NAH) for a vibro-acoustic system plays a vital role in conditioning the transfer function between the source and measuring points.
Laixu Jiang +3 more
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Variational Bayesian Compressive Sensing with Equivalent Source Modeling for Sound Field Reconstruction [PDF]
SensorsWhile conventional Bayesian compressive sensing exploits signal sparsity for accurate sound field reconstruction from under-sampled measurements, its practicality is limited by high computational complexity and slow convergence.
Yue Xiao +3 more
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Cyclostationary Near-field Acoustic Holography for Gearboxes
Jixie chuandongRegarding the problem that the traditional near-field acoustic holography (NAH) has difficulty in reconstructing the sound field of the gearbox, this work makes full use of the cyclostationary characteristics of the radiated noise and combines the ...
Zhu Song, Zhang Erliang, Gao Xiaoyu
doaj +1 more source
Half-Space Sound Field Reconstruction Based on the Combination of the Helmholtz Equation Least-Squares Method and Equivalent Source Method [PDF]
SensorsIn practical conditions, near-field acoustic holography (NAH) requires the measurement environment to be a free sound field. If vibrating objects are located above the reflective ground, the sound field becomes non-free in the presence of a reflecting ...
Laixu Jiang +4 more
doaj +2 more sources
Near-field acoustic holography in conical coordinates. [PDF]
The Journal of the Acoustical Society of America, 2009 Near-field acoustical holography (NAH) techniques can be optimized if the method capitalizes on the geometry of the noise source under investigation. Helmholtz-equation least squares method (HELS) uses the solutions of Helmholtz equation in spherical coordinates as basis functions for the pressure field. HELS is an efficient NAH technique if the source
Tracianne Neilsen +2 more
openaire +1 more source
Simple Estimation of Sound Source Directivity in Diffused Acoustic Field: Numerical Simulation [PDF]
한국해양공학회지, 2019 The directivity of an underwater sound source should be measured in an acoustically open field such as a calm sea or lake, or an anechoic water tank facility. However, technical difficulties arise when practically implementing this in open fields. Signal
Kookhyun Kim
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Statistically Optimized Near-Field Acoustic Holography Using Prolate Spheroidal Wave Functions
Shock and Vibration, 2023 Near-field acoustic holography (NAH) is an effective tool for realizing accurate sound field reconstruction in three-dimensional space on the prerequisite that appropriate elementary wave functions are selected or constructed to match the characteristics
Xuxin Zhang +4 more
doaj +1 more source
Zhongguo Jianchuan Yanjiu, 2023 ObjectivesLow sampling rates on reconstruction surfaces cause high reconstruction error in near-field acoustic holography. Therefore, a deep learning-based approach which is applicable to planar sound sources and high-precision reconstruction with low ...
Yuyang JI, Deyu WANG
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