A free field recovery technique based on the boundary element method and three-dimensional scanning measurements

Zhong-wei, Luo; Comesaña, Daniel Fernández; Zheng, Changjun; Bi, Chuan‐Xing

doi:10.1121/10.0007285

Cited by 2 publications

(1 citation statement)

References 33 publications

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“…As an extension of the NAH, FST has been developed in many versions based on the boundary element method [18][19][20][21], spherical wave superposition method [22,23], spatial Fourier transform [24][25][26], equivalent source method (ESM) [27][28][29][30][31][32], and statistically optimized near-field acoustic holography (SONAH) [33][34][35]. Among these basic methods, ESM and SONAH have shown better performance for reconstructing the sound field [36].…”

Section: Introductionmentioning

confidence: 99%

Sound field separation technique for nonplanar sources based on field prediction by using statistically optimized near-field acoustic holography

Cheng

Song

et al. 2023

Meas. Sci. Technol.

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For the sound field of cylindrical or compact sources, the current sound field separation technique (FST) based on statistically optimized near-field acoustic holography (SONAH) uses the planar wave to separate and has not studied the effects of different wave functions. However, the non-conformal problem between the hologram surface and the sound sources will have the risk of accuracy reduction. To solve this problem, a FST for nonplanar sources based on SONAH is proposed. First, according to the characteristic that field prediction of near-field acoustic holography will make errors attenuate, by moving the reconstruction surface to the prediction area, noise immunity of FST is effectively improved in a noisy environment. Subsequently, combining the shape of the sound source, the appropriate conformal wave function is determined and then substituted into the improved method in the first step to separate the free-field sound pressure. Finally, the simulations and the experiments of loudspeakers and a cylindrical experiment platform further proves the effectiveness of the proposed method, which can improve adaptability and reliability of FST in nonplanar sound sources in mechanical systems.

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Section: Introductionmentioning

confidence: 99%

Sound field separation technique for nonplanar sources based on field prediction by using statistically optimized near-field acoustic holography

Cheng

Song

et al. 2023

Meas. Sci. Technol.

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Measuring the radiation of sound sources with the radiation mode method: Towards realistic problems

Sanalatii,

Herzog,

Melon

et al. 2024

The Journal of the Acoustical Society of America

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The measurement of the pressure field radiated by a sound source has many applications in the fields of noise control and loudspeaker system design. In this paper, the radiation mode method is used to measure the field radiated by a complex acoustic source whose surface impedance is arbitrary and does not correspond to the Neumann boundary condition used for the calculation of radiation modes. The most effective radiation modes are used as test functions to calculate a pressure expansion around the source under test, an expansion that matches the measured pressure at a limited number of points close to the source. This expansion is then used to calculate the radiated pressure at a greater distance at unmeasured locations. In a first step, numerical simulations are performed to evaluate the method's most influential parameters. Then, measurements are performed in a semi-anechoic room on two real sources of increasing complexity. Obtained results show that the radiation mode method allows an accurate evaluation of the pressure field radiated by the test object over a fairly wide frequency band (between 100 Hz and 2 kHz) even for complex sources.

show abstract

A free field recovery technique based on the boundary element method and three-dimensional scanning measurements

Cited by 2 publications

References 33 publications

Sound field separation technique for nonplanar sources based on field prediction by using statistically optimized near-field acoustic holography

Sound field separation technique for nonplanar sources based on field prediction by using statistically optimized near-field acoustic holography

Measuring the radiation of sound sources with the radiation mode method: Towards realistic problems

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