Title: On the development of a new digitalised maintenance approach for factory of the future
Faculty: Faculty of Technology
Date: Wednesday 4 November 2020 at 9.15 am
Place: Room Newton (C1202), building C, Växjö, and via Zoom (the link will be presented about two hours before the public defence)
External reviewer: Professor Jayantha Prasanna Liyanage, University of Stavanger, Norway
Examining committee: Professor Benoît Iung, CRAN, University of Lorraine, France
Professor Mats Jackson, Dalarna University, Sweden
Professor Marco Macchi, Politecnico di Milano, Italy
Chairperson: Professor Gunnar Bolmsjö, Department of Mechanical Engineering, Linnaeus University
Main supervisor: Professor Basim Al-Najjar, Department of Mechanical Engineering, Linnaeus University
Assistant supervisor: Senior lecturer Anders Ingwald, Department of Physics and Electrical Engineering, Linnaeus University
Examiner: Associate professor Mirka Kans, Department of Mechanical Engineering, Linnaeus University
Spikning: Wednesday 7 October at 9.00 am at the University library in Växjö
Over time, maintenance methods have developed following the dynamic manufacturers’ demands. Now, with the coming industrial revolution, new maintenance approaches have to be developed to fulfil the new demands of future industry, as well as to allow companies to benefit from technological advances. Therefore, the research question of this study is: how to develop a maintenance approach for factories of the future? To answer this question, this thesis proposes tools to identify and prioritise maintenance related problems that impact company’s profitability. It explores designing and implementation of a digitalised maintenance approach for future factories. Furthermore, it investigates tools and methods to collect data efficiently by sensors.
The results achieved in this thesis are:
- a mathematical representation and application of a model that identifies and prioritises causes of deficiencies in production processes,
- a model that identifies and prioritises failures that impact the competitive advantages and profitability of companies,
- characterisation of a maintenance approach for future factories,
- frameworks that could be utilised to develop a maintenance approach for future factories, as well as, guidelines that help to design this approach,
- guidelines for the integration of digitalised maintenance with the database of other working areas,
- an algorithm for adaptive sampling for sensors, as well as, a proposal for a generic software architecture to facilitate designing, modelling and implementation of adaptive sampling algorithms.
The conclusion of this thesis confirms previous findings that maintenance has an impact on companies’ competitive advantages, other working areas and profitability. To design and implement a maintenance system, its elements should be extracted from the primary objective of maintenance. These elements should be then allocated in a suitable architecture and their mechanism should also be defined. Prior to implementation and integration, mapping the concept design to production problems can be used to examine its performance. An approach to collect data efficiently by sensors is to use adaptive sampling. The developed adaptive algorithm and the reference software framework for adaptive sampling algorithms could be used for this purpose.
failure impact, digitalised maintenance, adaptive sampling