期刊
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
卷 184, 期 -, 页码 -出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ymssp.2022.109677
关键词
Long-term diagnostic data; Model identification; Trend extraction; Heavy-tailed distribution; Impulsive noise; Time-varying characteristics; Machine condition prognosis
The paper proposes a framework for modeling long-term non-homogeneous data with non-Gaussian properties and validates it using real data. The novelty of this research lies in the use of non-Gaussian data, which reveals new findings for the predictive maintenance community and opens up new research directions.
To make prognosis one needs to build a model based on historical data. In the paper we propose a framework for modelling of long-term non-homogeneous data with non-Gaussian properties. These specific properties have been identified in real datasets describing the degradation process of the machine. The framework covers deterministic and random components separation, modelling of heavy-tailed, time-varying properties of random part as well as identification of possible autodependence hidden in the random sequence and identification of distribution for a random part. Due to non-linear trends, time-dependent scale (equivalent to the variance for Gaussian distributed data) and non-Gaussian characteristics present in the data, the final formula of the model is complex, its identification is challenging and requires specific, suitable to heavy-tailed processes, statistical methods. The paper provides two kind of novelties - first of all, it uses real data from condition monitoring systems and our findings may be novel and surprising to predictive maintenance community, secondly - processing such specific data opens new areas for general data modelling and highlight novel research directions.
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