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2022年 第17卷 第1期

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《机械工程前沿(英文)》 >> 2022年 第17卷 第1期 doi: 10.1007/s11465-021-0666-y

Acoustic fault signal extraction via the line-defect phononic crystals

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发布日期 :2022-03-15

摘要

Rotating machine fault signal extraction becomes increasingly important in practical engineering applications. However, fault signals with low signal-to-noise ratios (SNRs) are difficult to extract, especially at the early stage of fault diagnosis. In this paper, 2D line-defect phononic crystals (PCs) consisting of periodic acrylic tubes with slit are proposed for weak signal detection. The defect band, namely, the formed resonance band of line-defect PCs enables the incident acoustic wave at the resonance frequency to be trapped and enhanced at the resonance cavity. The noise can be filtered by the band gap. As a result, fault signals with high SNRs can be obtained for fault feature extraction. The effectiveness of weak harmonic and periodic impulse signal detection via line-defect PCs are investigated in numerical and experimental studies. All the numerical and experimental results indicate that line-defect PCs can be well used for extracting weak harmonic and periodic impulse signals. This work will provide potential for extracting weak signals in many practical engineering applications.

关键词

phononic crystals ; line-defect ; fault signal extraction ; acoustic enhancement

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京公网安备 11010502051620号 京ICP备11030251号-2