A delay-time model to integrate the sequence of resumable jobs, inspection policy, and quality for a single-component system. (February 2023)

• Record Type: Journal Article
• Authors: Sinisterra, Wilfrido Quiñones; Lima, Victor Hugo Resende; Cavalcante, Cristiano Alexandre Virginio; Aribisala, Adetoye Ayokunle
• Is Part Of: Reliability engineering & system safety. Volume 230(2023)
• Publication Date: 2023-02
• Subjects: 90B25 -- 90B35; Delay-time -- Inspection policy -- Job sequence -- Quality -- Rework -- Schedule; Reliability (Engineering) -- Periodicals; System safety -- Periodicals; Industrial safety -- Periodicals; Fiabilité -- Périodiques; Sécurité des systèmes -- Périodiques; Sécurité du travail -- Périodiques; 620.00452
• DOI: 10.1016/j.ress.2022.108902
• Languages: English
• ISSNs: 0951-8320

Abstract

Abstract: This study proposes a model that integrates the schedule of a sequence of resumable jobs and inspection policy in a critical single-component system, following a deterioration process modeled with a delay-time concept. Thus, the system can be in a good, defective or failed state. When the system is in a defective state, it decreases in product quality, which leads to an increase in the proportion of non-conforming items and rework activities. If the system fails, a minimal repair is required to restore the system to an operational condition but in a defective state. Consequently, we established a limit of m consecutive minimal repairs to prevent the system from producing a substantial proportion of non-conforming items. So, we propose a mathematical framework and a simulation model to minimize the expected total costs. Also, we develop a Genetic Algorithm to tackle medium-size instances and analyze some special cases of the model. Therefore, we solved a numerical case and performed a sensitive analysis. We compare the Genetic Algorithm with a heuristic algorithm, and our model with its straight simplification. In this last comparison, in the worst case tested, the "ignorance cost" could reach 335%. Highlights: The production quality shall be affected by the degraded state of the system. Degradation is investigated on the basis of generating nonconforming products. A solution-finding approach is proposed integrating a simulator and heuristic method. The model supports the decision on job sequences and inspections. Potential damage to the company's reputation can result from naive models.