A Delay-Time Model with Imperfect Inspections for Multi-Unit Systems / Model Opóźnień Czasowych Z Nieperfekcyjną Diagnozą Stanu Systemu Dla Systemów Wieloelementowych

Jodejko-Pietruczuk, Anna; Werbińska-Wojciechowska, Sylwia

doi:10.2478/jok-2013-0046

Cited by 6 publications

(2 citation statements)

References 36 publications

(39 reference statements)

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“…The literature models found which present this approach are limited to the positions [7,15]. Other models available in the literature focus on the results modelling of imperfect inspection application in a system with given assumptions and treat inspection accuracy as a given parameter of the maintenance policy (e.g., [28,31,[36][37][38][39]). Such models may be easily applied to evaluate results of available inspection methods varying due to their accuracy.…”

Section: Literature Reviewmentioning

confidence: 99%

Decision Problem on Imperfect Inspections Combined under Two-Stage Inspection Policy

Jodejko-Pietruczuk

2021

Applied Sciences

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Although one can presently observe great development in the methods for diagnosing conditions of technical systems, inspections which are not 100% accurate are still common in industry. If there are multiple available inspection methods which differ in accuracy of diagnosis, cost, or testing time, the answer for the question: which inspection method should be chosen is not a simple task. This paper addresses the problem and proposes a two-stage inspection policy model whose aim is to combine inspection methods that differ in their accuracy and cost features. The two-stage policy models that have been used so far in the literature assume that the second stage of an inspection is perfect, which is not always possible or profitable. For this reason, the mathematical model of the two-stage inspection policy with not-necessarily-perfect second stage is developed here, and its results are presented for the case study of diagnosing sealing in a hydraulic cylinder. The example proved that the application of mixed imperfect inspections could decrease maintenance cost, compared to the one-stage perfect inspection policy, by up to 35%. The paper also formulates a set of rules that support decision making while searching for cost-effective parameters of the two-stage policy. Their application is confirmed by a numerical example, which shows their potential in suboptimization of the proposed policy.

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Section: Literature Reviewmentioning

confidence: 99%

Decision Problem on Imperfect Inspections Combined under Two-Stage Inspection Policy

Jodejko-Pietruczuk

2021

Applied Sciences

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“…For more information, see https://creativecommons.org/licenses/by-nc-nd/4.0/ complicated and requires sophisticated solution methods [38]. Therefore, the conventional reliability analysis of time-to-first failure or time-between failures becomes insufficient to capture the relationship between the performance of the equipment and maintenance intervention [20].…”

Section: Introductionmentioning

confidence: 99%

Incorporating Human Factors in Delay Time Modeling of Inspection Maintenance Using Fuzzy Logic

Kolus

2023

IEEE Access

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Human factors (HF) affecting maintenance performance are common in practice, but have never been considered in delay-time modelling (DTM). The objective of this study is to integrate HF affecting maintenance performance in DTM to obtain an accurate and realistic optimal inspection interval. First, a list of HF that affects maintenance performance is identified through a literature review. Then, a conceptual framework is proposed to illustrate the integration of HF in the maintenance system. Three significant HF are selected, based on experts' opinion to be incorporated into the DTM, namely operator experience level, operator fatigue level, and task seriousness. Fuzzy modeling is used to estimate a time allowance for human factors, which can be added to the inspection duration of the DTM. Two inspection models are developed based on the modified DTM with the objectives of minimizing expected downtime and total cost per unit of time. Both models are validated against a realistic case study. Sensitivity analysis is performed to study the effect of HF on determining the optimal inspection interval. The results show that failing to account for HF results in increasing the frequency of (unnecessary) inspections; hence interruptions of production by up to 45.5% based on expected downtime and 49% based on expected total cost. This also results in the allocation of 25% to 92% less inspection time, which may significantly affect operator performance and work quality. The developed models provide a mechanism for decision makers to set an accurate inspection duration that accounts for HF and hence determines a realistic optimal inspection interval. In addition, the proposed conceptual framework can help manufacturing firms in designing maintenance systems with superior longterm performance.

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Delay-Time Models for Multi-unit Technical Systems Working in Various Reliability Structures

Werbińska-Wojciechowska

2019

Springer Series in Reliability Engineering

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A Delay-Time Model with Imperfect Inspections for Multi-Unit Systems / Model Opóźnień Czasowych Z Nieperfekcyjną Diagnozą Stanu Systemu Dla Systemów Wieloelementowych

Cited by 6 publications

References 36 publications

Decision Problem on Imperfect Inspections Combined under Two-Stage Inspection Policy

Decision Problem on Imperfect Inspections Combined under Two-Stage Inspection Policy

Incorporating Human Factors in Delay Time Modeling of Inspection Maintenance Using Fuzzy Logic

Delay-Time Models for Multi-unit Technical Systems Working in Various Reliability Structures

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