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Fuzzy-clustering of machine states for condition monitoring

Fuzzy Clustering von Machinenzuständen für die Zustandsbewertung
: Frieß, Uwe; Kolouch, Martin; Friedrich, Axel; Zander, Andreas


CIRP Journal of Manufacturing Science and Technology 23 (2018), S.64-77
ISSN: 1755-5817
Fraunhofer IWU ()
condition monitoring; fuzzy logic; machine tool

With the immense pressure to sustain competitiveness in manufacturing, the strategy of digitizing this industry sector is vital. With the onset of new ICT technology and big data capabilities, the physical asset and data computation is integrated in manufacturing through Cyber Physical Systems (CPS). This Industry 4.0 strategy will significantly improve maintenance of machines and processes. Current big-data approaches focus on data available in production systems for monitoring purposes. However, data processing to define critical characteristic values for condition monitoring and maintenance remains challenging. Large and special-purpose machine tools are constantly re-configured regarding process, workpiece and machine itself, thus increasing the complexity of determining limit values. Therefore, it is not possible to execute a robust condition monitoring without structured data-analyses considering different machine states. Fuzzy-clustering of machine states over time creates a stable pool representing different typical machine configuration clusters. Hence, new and discontinuous machine states can be gradually attributed to such clusters to interpret their key characteristic values and limits, even when the concrete configuration never occurred before.