Abstract
It is beneficial to maintain the normal operation of machines by conducting remaining useful life (RUL) prediction. Recently, graph data-driven machine RUL prediction methods have made a great success, since graph can model spatial and temporal dependencies of signals. However, the constructed graphs still have some limitations: (1) In the practical industrial production, the installation of multi-sensor networks is expensive and hard to achieve, so the single sensor is commonly used for data monitoring. However, most of these methods constructed graphs by establishing relationships between the different sensors, which are completely unsuitable for prediction tasks in single-sensor scenarios. (2) The quality of constructed graph is low, where the graph structure is fixed, failing in representing the machine degradation process. To overcome these limitations, a dynamic spatial–temporal (ST) graph-driven machine RUL prediction method using graph data augmentation (GDA) is proposed. The ST graph is constructed using short-time Fourier transform, capturing the frequency-domain and time-domain information hidden in the signals. Then, a GDA framework is designed to generate dynamic ST graphs, enlarging the structural differences of subgraphs. Subsequently, a GDA-based graph deep learning prediction model is constructed for dynamic ST graph-based RUL prediction, where an autoencoder-based graph embedding module is designed to replace simple Readout. Verification experiments are conducted on two case studies, and the results show that the proposed prediction method achieves a competitive performance.
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Abbreviations
- BiLSTM:
-
Bi-directional LSTM
- ChebGCN:
-
Chebyshev graph convolutional network
- CNN:
-
Convolutional neural network
- FC:
-
Fully connected
- GAT:
-
Graph attention network
- GCN:
-
Graph convolutional network
- GDA:
-
Graph data augmentation
- GDAGDL:
-
GDA-based graph deep learning
- LSTM:
-
Long short-term memory neural network
- MAE:
-
Mean absolute error
- MSE:
-
Mean squared error
- RMSE:
-
Root mean squared error
- RUL:
-
Remaining useful life
- ST:
-
Spatial–temporal
- STFT:
-
Short-time Fourier transform
- A :
-
Adjacent matrix
- A d :
-
Adjacent matrix of dynamic ST graph
- a T :
-
Weight vector of GAT
- c t / \(\tilde{c}_{t}\) :
-
Updated/ Candidate status in input gate
- E :
-
Edge set
- G/ G d :
-
Graph/ Dynamic ST graph
- \({\varvec{g}}_{i}\) :
-
Output of encoder network
- h t -1/ h t :
-
Output of previous/ current recurring unit
- T/ T i :
-
Node feature matrix/ Node feature
- \(\user2{T^{\prime}}_{i}\) :
-
Output of the graph attention layer
- V/ v i :
-
Node set/ Node
- W P :
-
Pearson correlation coefficient matrix
- \({\varvec{W}}^{\varphi }\) :
-
Weight vector obtained from FC
- \({\varvec{W}}^{\phi }\) :
-
Node importance vector
- W G :
-
Learned weight matrix from GAT
- W i/ W c/ W f/ W o :
-
Weight matrix of input gate/ cell/ forget gate/ output gate
- x t :
-
Information flowing into the recurrent unit of LSTM
- Y(k,m):
-
STFT magnitude
- Y GAT/ Y auto/Y LSTM :
-
Output of GAT/ autoencoder/ LSTM
- \({\varvec{y}}_{i}\) :
-
Reconstructed original input
- Z :
-
Predicted RUL
- \(\zeta^{\prime}_{ij}\)/\(\zeta_{ij}\) :
-
Regularized attention coefficient/Attention coefficient
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Acknowledgements
This work was supported in part by the National Key Research and Development Program of China under Grant 2020YFB1711203, and the National Natural Science Foundation of China under Grants 52205104, 61873101 and 72171096.
Funding
National Key Research and Development Program of China, 2020YFB1711203, Jie Liu. National Natural Science Foundation of China, 52205104, Jie Liu, 61873101, Kaibo Zhou, 72171096, Jie Liu
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Yang, C., Liu, J., Zhou, K. et al. Dynamic spatial–temporal graph-driven machine remaining useful life prediction method using graph data augmentation. J Intell Manuf 35, 355–366 (2024). https://doi.org/10.1007/s10845-022-02052-6
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DOI: https://doi.org/10.1007/s10845-022-02052-6