Effective feature extraction is critical for machinery fault diagnosis and prognosis. The use of frequency features and time-frequency features for machinery fault diagnosis has been prevalent in the last decade. However, more attentions have been drawn to machine learning based features recently. While frequency domain features can be directly correlated to fault type and fault level, statistical features are typically abstract representations. Most existing machine learning methods are based on supervised learning scheme to classify these abstract features for diagnostic purpose. Since labeled training data can be unreliable and hard to obtain, unsupervised fault diagnosis methods are often more desirable. Traditionally, only physics-based condition indicators can be used directly to indicate fault level and fault type. This paper aims to evaluate some of the unsupervised feature extraction methods by deep learning for 'meaningful' feature mining, i.e., disentangle and extract features that are related to the faults. We name this type of feature extraction method as disentangled tone mining (DTM), where each tone in the present work refers to certain latent structure in the spectrum. This paper has shown that fully unsupervised methods can potentially extract the 'trend' for machine health state, which can be used directly in on-line anomaly detection or prediction. Although not fully understood yet, the experimental results indicate that unsupervised deep sparse autoencoder can disentangle the fault related features from uncorrelated noise and self-track the potential fault evolution process.
|Original language||English (US)|
|Title of host publication||I2MTC 2018 - 2018 IEEE International Instrumentation and Measurement Technology Conference|
|Subtitle of host publication||Discovering New Horizons in Instrumentation and Measurement, Proceedings|
|Publisher||Institute of Electrical and Electronics Engineers Inc.|
|Number of pages||6|
|State||Published - Jul 10 2018|
|Event||2018 IEEE International Instrumentation and Measurement Technology Conference, I2MTC 2018 - Houston, United States|
Duration: May 14 2018 → May 17 2018
|Name||I2MTC 2018 - 2018 IEEE International Instrumentation and Measurement Technology Conference: Discovering New Horizons in Instrumentation and Measurement, Proceedings|
|Conference||2018 IEEE International Instrumentation and Measurement Technology Conference, I2MTC 2018|
|Period||5/14/18 → 5/17/18|
Bibliographical noteFunding Information:
This research is partially supported by natural science foundation of China under project No. 51505353 and Hubei nature science foundation No. 2016CFB584.
© 2018 IEEE.
- deep sparse autoencoder
- fault level
- pitting detection