基于时域信号分解的滚动轴承剩余寿命预测

REMAINING USEFUL LIFE PREDICTION OF ROLLING BEARINGS BASED ON TIME-DOMAIN SIGNAL DECOMPOSITION

  • 摘要: 针对基于时间序列输入的寿命预测方法难以提取多周期特征的问题,提出一种基于时域信号分解的滚动轴承剩余使用寿命预测方法。设计维度转化模块将一维振动信号依据显著频率解耦并转换到二维空间。通过多尺度残差注意力提取转换后的二维特征的局部和全局深层次语义信息,其中,多尺度特征提取能够同时捕捉周期内和周期间的依赖关系,残差注意力能够滤除无效的频段和特征。通过双向门控循环单元综合前向和后向的语义信息,结合自注意力机制进一步捕捉深层退化特征。在PHM2012数据集上的实验结果表明,与现有先进方法相比该方法具有更好预测性能。

     

    Abstract: In addressing the challenge of extracting multi- periodic features for lifetime prediction based on time- series inputs, we propose a residual life prediction method for rolling bearings based on time- domain signal decomposition. We designed a dimension transformation module to decouple one- dimensional vibration signals based on prominent frequencies and converted them into a two- dimensional space. Utilizing a multi- scale residual attention mechanism, we extracted local and global deep semantic information from the transformed two- dimensional features. This multi- scale feature extraction captured dependencies both within and between periods, while the residual attention mechanism effectively filtered out irrelevant frequency bands and features. By employing bidirectional gated recurrent units, we amalgamated the semantic information from both forward and backward directions, enhancing the capture of deep degradation features through self- attention mechanisms. Experimental results on the PHM2012 dataset demonstrate superior predictive performance of our proposed method compared with existing state- of- the- art techniques.

     

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