Reliability and Availability of Quality Control Based on Wavelet Computer Vision

Kuzmanić, Ivica; Vujović, Igor

doi:10.1007/978-3-319-13317-1

Cited by 2 publications

(3 citation statements)

References 5 publications

(8 reference statements)

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“…Reliability and availability of all systems in transport and industry play an important role in choosing a product by a customer [1]. This directly infl uences a planned maintenance [2,3].…”

Section: Introduction / Uvodmentioning

confidence: 99%

“…An example of reliability and availability research is explained in [1], where authors model a quality control system, which is based on computers. However, infl uencing parameters are hardware, software, and environment.…”

Section: Introduction / Uvodmentioning

confidence: 99%

“…Reliability and availability of an industrial computer system was presented in [1], which is similar to ship's system due to the scope of such systems. The diff erence is in a fact that ship's system should not fail between two harbours.…”

Section: Introduction / Uvodmentioning

confidence: 99%

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Reliability and Availability of Ship’s Computer Systems Based on Manufacturer’s Data and Worksheets

2020

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Computer controlled systems play important role aboard ships. Failure of such systems due to some component malfunction can be with fatal consequences. It is important to assess reliability and availability of such systems and minimum redundancy to ensure maintenance planning, ordering of spare components and safety of the voyage with as little as possible redundant components. This paper deals with development of model for reliability and availability of the computer system, which consists of three components with hot standby. Markov chains model is used to analyse probability of failure. Matrix of transitions is set after model development. Transition matrix is used to develop diff erential equations for model simulation. System's reliability is larger if the system is under constant maintenance and service, but it would not be available. Hence, the optimum between reliability and availability should be found. System's maintenance is limited during the voyage and hot standby is necessary to ensure success of the voyage. This paper presents a framework for assessment of reliability and availability of computer systems based on components' redundancy, and practical data about MTBF. Many versions of the shipboard computer systems can be evaluated using the presented framework. Sažetak Računalno upravljani sustavi imaju značajnu ulogu na brodovima. Kvar tih sustava zbog neispravnosti neke od sastavnica može imati kobne posljedice. Važno je procijeniti pouzdanost i raspoloživost tih sustava te njihovu minimalnu redundantnost da bi se osiguralo planiranje održavanja, naručivanje rezervnih dijelova i sigurna plovidba, uz što manje redundantnih sastavnica. Ovaj rad bavi se razvojem modela pouzdanosti i raspoloživosti računalnog sustava, koji se sastoji od triju sastavnica sa standby opcijom. Model Markovljevih lanaca koristi se za analizu vjerojatnosti greške. Matrica prijelaza sastavljena je nakon razvijanja modela. Ona se koristi za razvoj diferencijalnih jednadžbi za simulaciju modela. Pouzdanost je sustava veća ako se on neprekidno održava i servisira, ali to ne bi bilo raspoloživo. Stoga bi trebalo naći najbolje rješenje između pouzdanosti i raspoloživosti. Održavanje sustava ograničeno je tijekom plovidbe, a standby neophodan je da bi se osiguralo njezino uspješno obavljanje. U radu predstavlja se okvir za procjenu pouzdanosti i raspoloživosti računalnih sustava koji se temelje na redundantnosti sastavnice te na praktičnim podacima o MTBF-u. S pomoću predstavljenog okvira može se ocijeniti puno različitih inačica brodskih računalnih sustava.

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Section: Introduction / Uvodmentioning

confidence: 99%

Section: Introduction / Uvodmentioning

confidence: 99%

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Reliability and Availability of Ship’s Computer Systems Based on Manufacturer’s Data and Worksheets

2020

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Identifying the a priori time-to-failure distribution of unique highly vital elements using the expert method

Бочков

2023

Nadežnostʹ

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Abstract. Aim. Systematic failures, unlike random hardware failures, cannot be described using the mathematics of the probability theory and the dependability theory. However, such failures are the biggest problem due to their unpredictability. In the case of describing systematic failures of unique highly vital systems, a solution is presented by an approach that involves taking into account the quantitative criteria of functional performance of a facility in time that are defined, for example, by prescribing a set of parameters for each function that characterize its ability to perform, as well as acceptable limits for such parameters’ variation. The paper aims to develop an approach to the use of expert evaluation for the purpose of identifying the type and parameters of the distribution of the time to failure of unique highly vital elements. The author examined an approach to determining the a priori distribution of the time to failure of unique highly vital elements by pairwise comparison that would be useful for improving the accuracy of their dependability indicators.Methods. Hierarchy analysis, fuzzy logic and permutation theory were used. Fuzzy variables were introduced, the degrees of belonging to which are interpreted as subjective probabilities of the time to failure and its characteristics within different time intervals. Methods were proposed for accounting for the accuracy of expert evaluation and for solving the cluster sampling problem.

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Reliability and Availability of Quality Control Based on Wavelet Computer Vision

Cited by 2 publications

References 5 publications

Reliability and Availability of Ship’s Computer Systems Based on Manufacturer’s Data and Worksheets

Reliability and Availability of Ship’s Computer Systems Based on Manufacturer’s Data and Worksheets

Identifying the a priori time-to-failure distribution of unique highly vital elements using the expert method

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