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Joint optimization of condition-based maintenance policy and buffer capacity for a two-component self-repairable serial system
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Wenzhou University, China
Submission date: 2023-11-11
Final revision date: 2024-01-23
Acceptance date: 2024-03-01
Online publication date: 2024-03-13
Publication date: 2024-03-13
Corresponding author
Mengmeng Lin   

Wenzhou University, China
Eksploatacja i Niezawodność – Maintenance and Reliability 2024;26(2):185581
  • A new competitive interaction process between external shock and internal degradation process based on random external shocks is proposed.
  • A new self-repair mechanism is proposed.
  • The inside-out method for calculating the reliability of the system at any time during this process is given.
  • Dynamically relates the time and effect of each repair to the magnitude of the component by external shocks.
This paper investigates a self-repairable serial system with two components and a buffer. Competitive failure processes are considered due to the internal degradation and external shock processes of components. The system reliability is calculated based on the integration of the internal degradation process and external shock process. When one of the components deteriorates to the PM or CM thresholds, it is restored to an imperfect state under dynamic time limitations based on the previous internal degradation and external shocks. As for the other component, it needs to be repaired or not according to the reliability of the component; it needs to be shut down or not based on the buffer status and the allocation of the component in the system. The optimal initial buffer capacity setting and PM threshold at minimum cost are found by minimizing the system's total cost in a given running cycle. Finally, numerical and case studies are provided to demonstrate the feasibility and superiority of the presented model.
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