压缩感知字典迁移重构的小样本轴承故障诊断

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摘要针对实际应用中智能轴承故障诊断面临标签样本严重不足的问题，本文提出一种结合压缩感知、字典学习和迁移的数据增强算法，用于小样本故障诊断研究。首先，利用源域标签数据通过小波包字典学习和优化方法生成特定源域字典，并得到共享表示系数，获取故障内在信息；之后采用少量目标域信号微调共享表示系数，并更新源域字典生成迁移字典；最后通过共享表示系数和迁移字典生成大量具有目标域特征的新样本，实现数据增强。文中采用常用的深度故障诊断网络对本文的数据增强算法进行了诊断性能验证，结果表明该方法产生的信号具有故障的有效信息，用于模型训练和识别能够取得较好的诊断性能。本文方法为小样本故障诊断问题提出了新的思路。

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	孙洁娣1
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	赵彬集1
	温江涛3
	时培明3

关键词 ：轴承故障诊断, 数据增强, 压缩感知重构, 字典迁移

Abstract：To address the problem of the severe shortage of label samples for intelligent bearing fault diagnosis in practical applications, this paper proposes a data enhancement method combining compressed sensing, dictionary learning and transfer for small sample fault diagnosis research. Firstly, the source domain label data is used to generate a specific source domain dictionary through wavelet packet dictionary learning and optimization processing, and the shared representation coefficients are obtained to acquire the intrinsic fault information; then a small amount of target domain signals are used to fine-tune the shared representation coefficients, and the source domain dictionary is updated to generate a transfer dictionary; finally, a large number of new samples with target domain characteristics are generated through the representation coefficients and transfer dictionary to achieve data enhancement. The data augmentation algorithm is validated using a commonly used deep fault diagnosis network, and the results show that the signals generated by the method have valid information about the fault and can be used for model training and identification with good diagnostic performance. The proposed method provides a new idea for the small sample fault diagnosis.

Key words： Fault diagnosis Data augmentation Compressed Sensing reconstruction Transferred dictionary

收稿日期: 2023-02-15 出版日期: 2024-03-15

引用本文:

孙洁娣1,2，赵彬集1，温江涛3，时培明3. 压缩感知字典迁移重构的小样本轴承故障诊断[J]. 振动与冲击, 2024, 43(5): 62-71.
SUN Jiedi1,2,ZHAO Binji1,WEN Jiangtao3,SHI Peiming3. Small sample bearing fault diagnosis based on compressed sensing reconstruction and dictionary transfer. JOURNAL OF VIBRATION AND SHOCK, 2024, 43(5): 62-71.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2024/V43/I5/62

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