Results 1 to 10 of about 9,039,126 (121)

Modified Wideband Acoustical Holography for Improving the Identification of Acoustic Sources at Low Frequencies

IEEE Access, 2023
Source identification and sound field reconstruction using near-field acoustical holography (NAH) is particularly challenging when the measurement data are relatively fewer than the sources to reconstruct.
Laixu Jiang, Youhong Xiao, Guangping Zou, Jeong-Guon Ih   +3 more
doaj   +1 more source

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, Kent L. Gee, Michael D. Gardner   +2 more
openaire   +1 more source

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, Jingjun Lou, Jinfang Lu, Ronghua Li, Shijian Zhu   +4 more
doaj   +1 more source

A Cylindrical Near-Field Acoustical Holography Method Based on Cylindrical Translation Window Expansion and an Autoencoder Stacked with 3D-CNN Layers

Sensors, 2023
The performance of near-field acoustic holography (NAH) with a sparse sampling rate will be affected by spatial aliasing or inverse ill-posed equations.
Jiaxuan Wang, Weihan Zhang, Zhifu Zhang, Yizhe Huang   +3 more
doaj   +1 more source

Sound field separation with cross measurement surfaces. [PDF]

PLoS ONE, 2018
With conventional near-field acoustical holography, it is impossible to identify sound pressure when the coherent sound sources are located on the same side of the array.
Jin Mao, Jinfu Du
doaj   +1 more source

Robust Acoustic Imaging Based on Bregman Iteration and Fast Iterative Shrinkage-Thresholding Algorithm

Sensors, 2020
The acoustic imaging (AI) technique could map the position and the strength of the sound source via the signal processing of the microphone array. Conventional methods, including far-field beamforming (BF) and near-field acoustic holography (NAH), are ...
Linsen Huang, Shaoyu Song, Zhongming Xu, Zhifei Zhang, Yansong He   +4 more
doaj   +1 more source

A Ratio Model of L₁/L₂ Norm for Sound Source Identification

Sensors, 2020
In the field of sound source identification, robust and accurate identification of the targeted source could be a challenging task. Most of the existing methods select the regularization parameters whose value could directly affect the accuracy of sound ...
Linsen Huang, Zhongming Xu, Zhifei Zhang, Yansong He   +3 more
doaj   +1 more source

A Sound Source Identification Algorithm Based on Bayesian Compressive Sensing and Equivalent Source Method

Sensors, 2020
Near-field acoustic holography (NAH) based on equivalent source method (ESM) is an effective method for identifying sound sources. Conventional ESM focuses on relatively low frequencies and cannot provide a satisfactory solution at high frequencies.
Ming Zan, Zhongming Xu, Linsen Huang, Zhifei Zhang   +3 more
doaj   +1 more source

Four decades of near-field acoustic holography

The Journal of the Acoustical Society of America, 2022
The Reflections series takes a look back on historical articles from The Journal of the Acoustical Society of America that have had a significant impact on the science and practice of acoustics.
openaire   +3 more sources

A Fast Iterative Shrinkage/Thresholding Algorithm via Laplace Norm for Sound Source Identification

IEEE Access, 2020
As a powerful tool, near-field acoustical holography (NAH) recognizes the sound source effectively. The traditional equivalent source method (ESM) calculated by the Tikhonov regularization method could be available in the low-frequency band.
Linsen Huang, Zhongming Xu, Zhifei Zhang, Yansong He, Ming Zan   +4 more
doaj   +1 more source