Opportunistic maintenance for heterogeneous complex systems under continuous monitoring

Inma Castro (Corresponding author), Rob Basten, Geert-Jan van Houtum

Research output: Contribution to journalArticleAcademicpeer-review

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Abstract

The maintenance strategy for a complex system consisting of two types of components (non-monitored and monitored) is analyzed in this paper. Nonmonitored components can only be maintained correctively upon failure. Monitored components are monitored continuously and are maintained when they
become too degraded, i.e., just before its degradation level hits a threshold. For this complex system, an opportunistic maintenance strategy is implemented. It means that a maintenance intervention for one component can be used as an opportunity for preventive maintenance of monitored components: If the degradation level of a monitored component exceeds a preventive threshold at the time of another maintenance intervention, this component is maintained preventively. By performing these maintenance actions, different costs are incurred. The main concern of this paper is to optimise the preventive thresholds
that minimize the expected cost rate of the system. Using renewal techniques, the evaluation of the expected cost rate of this maintenance strategy is time consuming, especially for a large number of monitored components. However, using semi-regenerative techniques the required computation time is drastically shorten: For a system with ten monitored components, the computation time to evaluate the optimal maintenance strategy goes from more than a day to few seconds. Numerical examples are given to illustrate the results.
Original languageEnglish
Number of pages21
JournalReliability Engineering and System Safety
Publication statusAccepted/In press - 11 Nov 2019

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Large scale systems
Monitoring
Costs
Degradation
Preventive maintenance

Keywords

  • Condition Based Maintenance
  • Opportunistic maintenance
  • Complex systems
  • Semi-regenerative process

Cite this

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title = "Opportunistic maintenance for heterogeneous complex systems under continuous monitoring",
abstract = "The maintenance strategy for a complex system consisting of two types of components (non-monitored and monitored) is analyzed in this paper. Nonmonitored components can only be maintained correctively upon failure. Monitored components are monitored continuously and are maintained when theybecome too degraded, i.e., just before its degradation level hits a threshold. For this complex system, an opportunistic maintenance strategy is implemented. It means that a maintenance intervention for one component can be used as an opportunity for preventive maintenance of monitored components: If the degradation level of a monitored component exceeds a preventive threshold at the time of another maintenance intervention, this component is maintained preventively. By performing these maintenance actions, different costs are incurred. The main concern of this paper is to optimise the preventive thresholdsthat minimize the expected cost rate of the system. Using renewal techniques, the evaluation of the expected cost rate of this maintenance strategy is time consuming, especially for a large number of monitored components. However, using semi-regenerative techniques the required computation time is drastically shorten: For a system with ten monitored components, the computation time to evaluate the optimal maintenance strategy goes from more than a day to few seconds. Numerical examples are given to illustrate the results.",
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language = "English",
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Opportunistic maintenance for heterogeneous complex systems under continuous monitoring. / Castro, Inma (Corresponding author); Basten, Rob; van Houtum, Geert-Jan.

In: Reliability Engineering and System Safety, 11.11.2019.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Opportunistic maintenance for heterogeneous complex systems under continuous monitoring

AU - Castro, Inma

AU - Basten, Rob

AU - van Houtum, Geert-Jan

PY - 2019/11/11

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N2 - The maintenance strategy for a complex system consisting of two types of components (non-monitored and monitored) is analyzed in this paper. Nonmonitored components can only be maintained correctively upon failure. Monitored components are monitored continuously and are maintained when theybecome too degraded, i.e., just before its degradation level hits a threshold. For this complex system, an opportunistic maintenance strategy is implemented. It means that a maintenance intervention for one component can be used as an opportunity for preventive maintenance of monitored components: If the degradation level of a monitored component exceeds a preventive threshold at the time of another maintenance intervention, this component is maintained preventively. By performing these maintenance actions, different costs are incurred. The main concern of this paper is to optimise the preventive thresholdsthat minimize the expected cost rate of the system. Using renewal techniques, the evaluation of the expected cost rate of this maintenance strategy is time consuming, especially for a large number of monitored components. However, using semi-regenerative techniques the required computation time is drastically shorten: For a system with ten monitored components, the computation time to evaluate the optimal maintenance strategy goes from more than a day to few seconds. Numerical examples are given to illustrate the results.

AB - The maintenance strategy for a complex system consisting of two types of components (non-monitored and monitored) is analyzed in this paper. Nonmonitored components can only be maintained correctively upon failure. Monitored components are monitored continuously and are maintained when theybecome too degraded, i.e., just before its degradation level hits a threshold. For this complex system, an opportunistic maintenance strategy is implemented. It means that a maintenance intervention for one component can be used as an opportunity for preventive maintenance of monitored components: If the degradation level of a monitored component exceeds a preventive threshold at the time of another maintenance intervention, this component is maintained preventively. By performing these maintenance actions, different costs are incurred. The main concern of this paper is to optimise the preventive thresholdsthat minimize the expected cost rate of the system. Using renewal techniques, the evaluation of the expected cost rate of this maintenance strategy is time consuming, especially for a large number of monitored components. However, using semi-regenerative techniques the required computation time is drastically shorten: For a system with ten monitored components, the computation time to evaluate the optimal maintenance strategy goes from more than a day to few seconds. Numerical examples are given to illustrate the results.

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KW - Opportunistic maintenance

KW - Complex systems

KW - Semi-regenerative process

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SN - 0951-8320

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