A combined sound field reconstruction method for large cylindrical surfaces using non-conformal plane measurement

Cheng, Wei; Han, Shengming; Song, Chao; Nie, Zelin; Chen, Xuefeng; Zhang, Peng; Ni, Jinglei

doi:10.1088/1361-6501/ac2f53

Cited by 4 publications

(3 citation statements)

References 28 publications

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“…But it may be worth noting that adding an extra reconstruction step in the proposed method may introduce more errors. Therefore, regularization needs to be carried out carefully to restrain reconstruction errors (Cheng et al, 2022).…”

Section: Implementation Of the Proposed Methodsmentioning

confidence: 99%

Conical near-field acoustic holography based on cylindrical wave function of variable radius and nonconformal plane measurement

Cheng

Song

Han

et al. 2023

Transactions of the Institute of Measurement and Control

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In practical acoustical measurement for large cones, maintaining coaxial and conformal between the holographic surface and reconstructed surface is usually tedious. To overcome this flaw, a conical near-field acoustic holography (NAH) based on cylindrical wave function of variable radius and nonconformal plane measurement is proposed in this paper. First, cylindrical wave function of variable radius (VR)–based modified statistically optimal cylindrical NAH (SOCNAH) method, entitled VR-SOCNAH, is proposed, which is more applicable to conical surfaces. Second, with the measured sound pressure data on the holographic plane, sound pressure on the conical conformal surface is first reconstructed using statistically optimal planar NAH (SOPNAH), and sound pressure on the reconstructed surface is then reconstructed using VR-SOCNAH. Third, fixed and variable radius measurement methods are comparatively studied, and the former is adopted. Furthermore, a measurement parameter optimization method based on orthogonal experiment is proposed to determine appropriate value ranges. Finally, the proposed NAH is applied to a test bed, and the robustness and accuracy of sound field reconstruction for large cones are significantly enhanced, which provides reliable scientific basis and engineering guidance for noise monitoring and control of mechanical equipment.

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Section: Implementation Of the Proposed Methodsmentioning

confidence: 99%

Conical near-field acoustic holography based on cylindrical wave function of variable radius and nonconformal plane measurement

Cheng

Song

Han

et al. 2023

Transactions of the Institute of Measurement and Control

Self Cite

View full text Add to dashboard Cite

show abstract

“…For example, planar waves represent flat sources, spherical waves are used for compact sources, and cylindrical waves are used for cylindrical sound sources. In a previous study [40], it has been proved that it is feasible to reconstruct the sound field of a cylindrical sound source using plane measurement, and cylindrical waves can be used to reconstruct cylindrical sound fields with higher accuracy compared with plane waves.…”

Section: Field Separation Technique For Nonplanar Sourcesmentioning

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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“…Near-field acoustic holography (NAH) [1][2][3][4] reconstructs the acoustic quantities at the source surface and at any point in the entire three-dimensional sound field by measuring the complex acoustic pressure or vibration velocity on the near-field because of its large measuring surface and high density of sensors.…”

Section: Introductionmentioning

confidence: 99%

Application of equivalent source intensity density interpolation in near-field acoustic holography

Gao

Yang

et al. 2023

Meas. Sci. Technol.

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The spatial resolution of near-field acoustic holography based on the equivalent source method (ESM) is closely related to the number of measurement points, the higher the number of measurement points, the higher the resolution. However, the number of measurement points in the actual measurement cannot be increased infinitely. To solve the contradiction between the resolution and the number of measurement points, this paper proposes an equivalent source density interpolation method (ESDIM). First, the equivalent source intensity is obtained using the sound pressure measured by the array element and the Green function, and the equivalent source intensity density is obtained based on the equivalent source intensity and grid area. Second, the Hermite interpolation function was used to obtain the interpolated equivalent source intensity density. However, as the number of interpolated grids increased, the resolution, computation, and running time of ESDIM increased, and the number of subdivided grids per unit grid was 9-25 in this study. Finally, the sound field was reconstructed based on the obtained interpolated equivalent source intensity and Green transfer function, and the reconstruction accuracies of ESDIM and ESM were compared and analyzed. The simulation and experimental data processing results showed that the resolution of the equivalent source intensity density interpolation method was higher than that of the equivalent source method.

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A combined sound field reconstruction method for large cylindrical surfaces using non-conformal plane measurement

Cited by 4 publications

References 28 publications

Conical near-field acoustic holography based on cylindrical wave function of variable radius and nonconformal plane measurement

Conical near-field acoustic holography based on cylindrical wave function of variable radius and nonconformal plane measurement

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

Application of equivalent source intensity density interpolation in near-field acoustic holography

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