期刊
FRONTIERS OF MECHANICAL ENGINEERING
卷 17, 期 1, 页码 -出版社
HIGHER EDUCATION PRESS
DOI: 10.1007/s11465-021-0666-y
关键词
phononic crystals; line-defect; fault signal extraction; acoustic enhancement
资金
- National Natural Science Foundation of China [52175087]
This paper proposes a two-dimensional line-defect phononic crystal for weak signal detection. The line-defect phononic crystal can trap and enhance the incident acoustic wave at the resonance frequency, filtering out noise and obtaining fault signals with high signal-to-noise ratios.
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.
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