Implementation of System Operation Modes for Health Management and Failure Prognosis in Cyber-Physical Systems

Cyber-physical systems (CPSs) have sophisticated control mechanisms that help achieve optimal system operations and services. These mechanisms, imply considering multiple signal inputs in parallel, to timely respond to varying working conditions. Despite the advantages that control mechanisms convey...

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Bibliographic Details
Published in:Sensors (Basel, Switzerland) Switzerland), 2020-04, Vol.20 (8), p.2429
Main Authors: Ruiz-Arenas, Santiago, Rusák, Zoltán, Mejía-Gutiérrez, Ricardo, Horváth, Imre
Format: Article
Language:English
Subjects:
Adaptation
Cyber-physical systems
Failure
Failure prevention
failure prognosis
Fault diagnosis
health management
Masking
Methods
Probability distribution
Prognosis
Statistical methods
system maintenance
system operation modes
system reliability
Trends
Useful life
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Summary:Cyber-physical systems (CPSs) have sophisticated control mechanisms that help achieve optimal system operations and services. These mechanisms, imply considering multiple signal inputs in parallel, to timely respond to varying working conditions. Despite the advantages that control mechanisms convey, they bring new challenges in terms of failure prevention. The compensatory action the control exerts cause a fault masking effect, hampering fault diagnosis. Likewise, the multiple information inputs CPSs have to process can affect the timely system response to faults. This article proposes a failure prognosis method, which combines time series-based forecasting methods with statistically based classification techniques in order to investigate system degradation and failure forming on system levels. This method utilizes a new approach based on the concept of the system operation mode (SOM) that offers a novel perspective for health management that allows monitoring the system behavior, through the frequency and duration of SOMs. Validation of this method was conducted by systematically injecting faults in a cyber-physical greenhouse testbed. The obtained results demonstrate that the degradation and fault forming process can be monitored by analyzing the changes of the frequency and duration of SOMs. These indicators made possible to estimate the time to failure caused by various failures in the conducted experiments.
ISSN:1424-8220
1424-8220
DOI:10.3390/s20082429