Abstract
Residual useful life (RUL) prediction is the core of prognostics and health management. Similarity-based residual life prediction (SbRLP) is vital in RUL prediction due to its independence from degradation modeling, as well as high accuracy and robustness in prediction. However, researchers typically adopt a fixed time scale and global similarity search to perform similarity measurement, leading to considerable prediction errors and prolonged prediction times. Hence, a novel SbRLP method based on a dynamic time scale and local similarity search is proposed herein. First, the monitoring variables are reduced using the variable selection method based on multilayer information overlap. Next, the health states of reference samples are divided into five states using the K-means algorithm and the health states of the operating sample are recognized using the L-KNN algorithm. Further, dynamic time scales of the operating and reference samples are determined based on their length proportions of degradation trajectory at different prediction times. The local similarity search intervals of reference samples are obtained based on their health state levels. Next, the RULs of the operating sample are predicted using the local similarity search intervals and dynamic time scales. Finally, the effectiveness and superiority of the enhanced SbRLP are demonstrated using the commercial modular aero-propulsion system simulation dataset. The results reveal that the enhanced SbRLP yields a more accurate and efficient prediction of RUL in comparison with alternative methods.
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Abbreviations
- RUL:
-
Residual useful life
- PHM:
-
Prognostics and health management
- DTW:
-
Dynamic time warping
- SOMM:
-
Self-organizing map models
- SVDD:
-
Support vector data descriptions
- LSTM:
-
Long short-term memory
- PCA:
-
Principal component analysis
- HPC:
-
High-pressure compressor
- LPT:
-
Low-pressure turbine
- RMSE:
-
Root-mean-square error
- L-KNN:
-
KNN algorithm fused with LSTM
- SbRLP:
-
Similarity-based residual life prediction
- DCNN:
-
Deep convolutional neural network
- SVM:
-
Support vector machines
- CHSMM:
-
Continuous hidden semi-Markov models
- KNN:
-
K-nearest neighbors
- C-MAPSS:
-
Commercial modular aero-propulsion system simulation
- LPC:
-
Low-pressure compressor
- HPT:
-
High-pressure turbine
- MAE:
-
Mean absolute error
- Score:
-
Score function
- \(rr_{ab}\) :
-
Person correlation of variables \(a\) and \(b\)
- \(pp_{ab}\) :
-
\(A - 2\)-Order partial correlation of variables \(a\) and \(b\)
- \({\text{SIO}}_{a}\) :
-
Univariate information overlap of variable \(a\)
- \(R_{a}\) :
-
Person correlation between variable \(a\) and the monitoring time
- \(X_{{{\text{r}}i}} \left( {q \cdot \Delta t} \right)\) :
-
Value of reference sample \(i\) at sampling point \(q\)
- \(\psi_{{{\text{r}}i}}^{k} \left( {q \cdot \Delta t} \right)\) :
-
Weight of the \(k\) th nearest neighbor sample of \(X_{ri} \left( {q \cdot \Delta t} \right)\)
- \(H_{{\text{o}}}^{p}\) :
-
Time scale of the operating sample at time \(p \cdot \Delta t\)
- \(w_{d}\) :
-
Importance of variable \(d\)
- \(K_{{{\text{r}}i}}^{5} \cdot \Delta t\) :
-
Failure time of the \(i\) th reference sample
- \({\text{HS}}_{g}\) :
-
Best health state in \({\text{HD}}_{{{\text{op}}}}\)
- \({\text{Sim}}\left( {p,H_{{\text{o}}}^{p} ,i,H_{{{\text{r}}i}}^{p} ,q} \right)\) :
-
Similarity between sequences \(Y_{{{\text{op}}}}\) and \(Y_{{{\text{r}}i}}^{p}\)
- \({\text{SSI}}_{{{\text{r}}i}}^{p}\) :
-
Local similarity search interval of the \(i\) th reference sample at time \(p \cdot \Delta t\)
- \({\text{ARL}}_{ri} (p)\) :
-
Actual RUL of the \(i\) th reference sample
- \(x_{{{\text{r}}i}}^{d} \left( {q \cdot \Delta t} \right)\) :
-
Value of variable \(d\) of reference sample \(i\) at sampling point \(q\)
- \(cc_{ab}\) :
-
One element in the inverse matrix of the correlation matrix \(\left( {rr_{ab} } \right)_{A \times A}\)
- \({\text{TIO}}_{A}\) :
-
Overall information overlap of \(A\) monitoring variables
- \({\text{MSA}}_{a} \left( A \right)\) :
-
Correlation between variable \(a\) and other \(A - 1\) variables
- \(d_{{{\text{r}}i}}^{k} \left( {q \cdot \Delta t} \right)\) :
-
Euclidean distance between \(X_{{{\text{r}}i}} \left( {q \cdot \Delta t} \right)\) and its \(k\) th nearest neighbor sample
- \(y_{{\text{o}}} \left( p \right)\) :
-
Health index of the operating sample at time \(p \cdot \Delta t\)
- \(X_{{\text{o}}} \left( {p \cdot \Delta t} \right)\) :
-
Value of the operating sample at sampling point \(p\)
- \(Y_{{{\text{op}}}}\) :
-
Similarity measurement sequence of the operating sample at time \(p \cdot \Delta t\)
- \(H_{{{\text{r}}i}}^{p}\) :
-
Time scale of the \(i\) th reference sample
- \({\text{EM}}_{{\text{o}}}\) :
-
Expected lifetime of the operating sample
- \({\text{HS}}_{l}\) :
-
Worst one health state in \({\text{HD}}_{{{\text{op}}}}\)
- \(Y_{{{\text{r}}i}}^{p}\) :
-
Similarity measurement sequence of reference sample \(i\) at time \(p \cdot \Delta t\)
- \(N_{{{\text{r}}i}} \left( p \right)\) :
-
Similarity sampling point of the \(i\) th reference sample corresponding to the similarity \(S_{o \leftrightarrow ri} (p)\)
- \({\text{PRL}}_{{\text{o}}} \left( p \right)\) :
-
RUL of the operating sample at time \(p \cdot \Delta t\)
- \(x_{{\text{o}}}^{d} \left( {q \cdot \Delta t} \right)\) :
-
Value of variable \(d\) of the operating sample at sampling point \(q\)
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Funding
The paper is financially supported by the Science and technology planning project of Zhejiang provincial market supervision administration (Project number: ZD2024005); open foundation of the key laboratory of intelligent robot for operation and maintenance of Zhejiang Province (Project number: SZKF-2022-R05); National Natural Science Foundation of China (Project number: 52175257); National key R&D plan project (Project number: 2021YFC3340400); and Key R&D project of Zhejiang Province (Project number: 2021C01053).
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Gu, M.Y., Dai, Z.X., Wu, H.T. et al. Similarity-based residual life prediction method based on dynamic time scale and local similarity search. J Braz. Soc. Mech. Sci. Eng. 46, 276 (2024). https://doi.org/10.1007/s40430-024-04857-3
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DOI: https://doi.org/10.1007/s40430-024-04857-3