Variable-scale demodulation extraction method for early-stage multiple damage fault information of mechanical transmission part

Through technologies such as variational modal decomposition and signal reweighting, the vibration signals of mechanical transmission parts are processed, the fine scale frequency band is automatically selected, and the early multiple damage fault information is extracted, which solves the problems of missed diagnosis and rapid fault degradation in the existing technology, and achieves high-accurate fault diagnosis.

CN119719668APending Publication Date: 2025-03-28JILIN UNIVERSITY
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Patent Information

Application Number
CN202411803894.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-09
Publication Date
2025-03-28

AI Technical Summary

Technical Problem

The prior art is difficult to effectively extract information on multiple damage and faults in early mechanical transmission parts, especially when noise interference and multiple faults interfere with each other, resulting in misdiagnosis and rapid degradation of faults.

Method used

The original vibration signal is decomposed by the variational modal decomposition method, the fault information related index CFII is calculated, and the noise reduction reconstruction is achieved through the signal reweighting criterion, the coarse scale frequency band range where the fault information is located is retained, and the fine scale frequency band is automatically selected through the cyclic spectrum coherence spectrum and square enhancement envelope spectrum analysis, and the early multiple damage fault information is extracted.

Benefits of technology

Effectively overcome the mutual interference between noise and multiple faults, accurately extract information on multiple damage and faults in early mechanical transmission parts, reduce the risk of missed diagnosis, and improve the accuracy and reliability of fault diagnosis.

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Abstract

The invention relates to a variable-scale demodulation extraction method for early-stage multiple damage fault information of a mechanical transmission part, and belongs to the technical field of mechanical vibration signal processing and fault diagnosis. The method comprises the following steps: decomposing an input original vibration signal, calculating fault information related index values of all sub-signals BLIMF, constructing a signal reweighting criterion, calculating a cyclic spectrum coherence spectrogram of a reconstructed signal, establishing a demodulation frequency band optimization criterion, and carrying out envelope spectrum demodulation analysis and identification on a fine scale frequency band. And variable-scale demodulation extraction and diagnosis of early-stage multiple damage fault information are completed. According to the method, the problem that multiple faults are missed due to the fact that an existing fault information demodulation method focuses on single fault information is solved, the method is particularly suitable for multiple fault vibration signals with adjacent resonance frequency bands, and variable-scale demodulation extraction of early-stage multiple damage fault information of a mechanical transmission part can be achieved within the full-frequency-band range; the method can automatically evaluate the richness of fault information of frequency bands with different scales, and is more suitable for industrial application.
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