A High-Resolution and Low-Frequency Acoustic Beamforming Based on Bayesian Inference and Non-Synchronous Measurements

Chu, Ning; Ning, Yue; Yu, Liang; Huang, Qikai; Wu, Dazhuan

doi:10.1109/access.2020.2991606

Cited by 27 publications

(4 citation statements)

References 28 publications

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“…In line with these findings, a COF of 0.6 was used in the current study for ANSYS static structural analysis. The selection of the coefficient of friction (COF) value of 0.6 was carefully considered and based on a thorough literature review and common in- To examine the impact of higher frequencies on the disassembly process, a threshold of 1500 Hz was selected as a relatively high frequency [33]. This was performed to bridge the gap between previous research conducted by Gutowski et al [21], who studied high frequency (4000 Hz), and Dieudonne' et al [3], who examined low frequency (4-60 Hz).…”

Section: Vibration-assisted Disassemblymentioning

confidence: 99%

Non-Destructive Disassembly of Interference Fit under Wear Conditions for Sustainable Remanufacturing

Au-Yeung,

Ataya,

Hassanin

et al. 2023

Machines

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Remanufacturing has been gaining increasing attention in the last few years as a part of green engineering. It is the process of restoring the original specifications of a given product utilizing a combination of new, repaired, and old parts. The present study investigates non-destructive disassembly of an interference fit pin-hub joint to enable the reuse of worn parts with the same loading capacity. The aim is to reduce the disassembly force while preventing plastic deformation and frictional damage on the contact surface to avoid fretting failure and enable further coating. A finite element model of a shaft/hub interference fit was developed, taking into account two cases of damage to the mating parts: deformation and corrosion. The results indicate that thermal disassembly is effective in reducing breaking force by 50% in deformed joints, whereas vibration waves are more suitable for corroded parts with increased friction. In addition, applying a low-frequency oscillation force to the axis of disassembly reduces the pulling out force by 5% and plastic deformation by 99% due to acoustic softening effects. Furthermore, using a heat flux simultaneously with vibration decreases the breaking force by 85%, indicating the higher effectiveness of thermal-aided disassembly and vibration-assisted disassembly in reducing the breaking force of corroded parts with increased friction. This study provides remanufacturing designers with efficient tools to weaken the interference fit and decrease the disconnecting force, ultimately reducing the cost and time required for the disassembly process.

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Section: Vibration-assisted Disassemblymentioning

confidence: 99%

Non-Destructive Disassembly of Interference Fit under Wear Conditions for Sustainable Remanufacturing

Au-Yeung,

Ataya,

Hassanin

et al. 2023

Machines

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“…In Refs. [27,28], a non-synchronous array measurement is elaborated to break through the beamforming barrier of acoustic imaging in the low-frequency domain. The above research has focused on improving imaging algorithms to enhance positioning speed, accuracy, and economy.…”

Section: Introductionmentioning

confidence: 99%

Topology Optimization Design Method for Acoustic Imaging Array of Power Equipment

Xiong,

Zha,

Pei

et al. 2024

Sensors

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Acoustic imaging technology has the advantages of non-contact and intuitive positioning. It is suitable for the rapid positioning of defects such as the mechanical loosening, discharge, and DC bias of power equipment. However, the existing research lacks the optimization design of microphone array topology. The acoustic frequency domain characteristics of typical power equipment are elaborately sorted out. After that, the cut-off frequencies of acoustic imaging instruments are determined, to meet the needs of the full bandwidth test requirements. Through a simulation calculation, the circular array is demonstrated to be the optimal shape. And the design parameters affect the imaging performance of the array to varying degrees, indicating that it is difficult to obtain the optimal array topology by an exhaustive method. Aimed at the complex working conditions of power equipment, a topology optimization design method of an acoustic imaging array for power equipment is proposed, and the global optimal solution of microphone array topology is obtained. Compared with the original array, the imaging performance of the improved LF and HF array is promoted by 54% and 49%, respectively. Combined with the simulation analysis and laboratory test, it is verified that the improved array can not only accurately locate the single sound source but also accurately identify the main sound source from the interference of the contiguous sound source.

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“…A different way for achieving a large array and high microphone density is to scan the object of interest by moving sequentially a prototype array (an arbitrary array), which is referred to as non-synchronous measurements [36], [37]. A large and dense microphone array can simultaneously acquire all the information of the spectral matrix, but nonsynchronous measurements can only acquire a block diagonal spectral matrix.…”

Section: Introductionmentioning

confidence: 99%

Low Complexity Modeling of Cross-Spectral Matrix and Its Application in the Non-Synchronous Measurements of Microphones Array

Fan

Chu

et al. 2021

IEEE Access

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The resolution related with the image quality of acoustic imaging using a microphone array is limited by the size and density of the array. However, non-synchronous measurements can exceed the constraints defined by measurements with a single fixed array. The non-synchronous measurements can achieve a larger and denser aperture array by moving the single array. The key problem of archiving the non-synchronous measurements of a microphone array is the matrix completion of a block diagonal spectral matrix. A comprehensive investigation of the block diagonal spectral matrix completion is still missing in the microphone array signal processing literature since it is usually considered as a difficult problem if without the integrated physical information of the sound field. In this paper, the mathematical relation between the max-norm and the nuclear-norm is pointed out, and the max-norm minimization of the spectral matrix is discussed, which is an effective model with integrated spatial representation of the sound field for the spectral matrix completion. First, the max-norm is utilized for the low complexity modeling and the corresponding Proximal-Point method for Max-norm based Spectral matrix completion (PPMSMC) is proposed; Second, the rank, nuclear-norm and max-norm have been investigated as complexity measures in the context of spectral matrix completion, and their performances are compared. The proposed low-rank methods have constructed a concrete theorem foundation for the non-synchronous measurements of the microphone array.INDEX TERMS Acoustic measurements, low complexity model, max-norm minimization.

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A High-Resolution and Low-Frequency Acoustic Beamforming Based on Bayesian Inference and Non-Synchronous Measurements

Cited by 27 publications

References 28 publications

Non-Destructive Disassembly of Interference Fit under Wear Conditions for Sustainable Remanufacturing

Non-Destructive Disassembly of Interference Fit under Wear Conditions for Sustainable Remanufacturing

Topology Optimization Design Method for Acoustic Imaging Array of Power Equipment

Low Complexity Modeling of Cross-Spectral Matrix and Its Application in the Non-Synchronous Measurements of Microphones Array

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