Abstract
Mechanical system fault diagnosis is essential to save costs and ensure safety. Generally, rotating machinery operates in nonstationary cases, which makes fault features complex and difficult to identify. However, existing fault diagnosis methods have the following limitations. (1) Consider only time or frequency domain features fusion. (2) Extract the fusion features representation only in the Euclidean domain. Based on that, a novel method based on multisensory time-frequency features fusion and graph attention network is proposed for rotating machinery fault diagnosis under the nonstationary case. First, the multi-sensor time series are converted into multi-sensor time-frequency maps by image-to-matrix, matrix concatenation, and matrix-to-image operations. Then, simple linear iterative clustering is applied to make the superpixels in the multi-sensor time-frequency maps into nodes and form graphs based on color and texture features. Finally, the graph attention network with residual connection is applied to distinguish the rotating machinery’s health status. The proposed method is verified using gearbox test rig data and bearing public data, respectively. The experimental results indicate that the proposed method can provide more reliable and accurate fault diagnosis results for rotating machinery than other methods.



















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The data that support the findings of this study are available from the corresponding author upon request.
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Acknowledgements
The authors would like to thank the editor and referees for their valuable comments. This work was supported by the National Natural Science Foundation of China (Grant No. 52075392).
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JL: methodology, software, formal analysis, writing—original draft. FX: formal analysis, writing—original draft. QZ: writing—original draft. QL: formal analysis, writing—original draft. XW: conceptualization, writing—review and editing. SW: writing—review and editing.
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Liu, J., Xie, F., Zhang, Q. et al. A multisensory time-frequency features fusion method for rotating machinery fault diagnosis under nonstationary case. J Intell Manuf 35, 3197–3217 (2024). https://doi.org/10.1007/s10845-023-02198-x
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DOI: https://doi.org/10.1007/s10845-023-02198-x