Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

English (EN)·Polski (PL)·Yкраїнський (UK)
Przejdź do strony domowej biblioteki Centralna Biblioteka Wojskowa Link otwiera się w nowym oknie Logo biblioteki Prolib Integro - strona głównaCentralna Biblioteka Wojskowa

Wyszukujesz frazę "Weibull" wg kryterium: Temat

  Lista filtrów
Wyrównaj
    Wyświetlanie 1-9 z 9
    Tytuł:
    Monte Carlo method for reliability of parallel system with dependent failures of component
    Autorzy:
    Grabski, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/2069174.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
    Tematy:
    reliability
    stochastic process
    Weibull distribution
    dependency
    Opis:
    A problem of parallel system reliability with dependent failures of components is presented in the paper. It is assumed that lifetimes of components are independent random variable having Weibull distribution. We take under consideration a parallel (in reliability meaning) system consisting of n independent at the beginning of work and identical components. We assume that a load of the working system affects on the reliability of its components and the load of the system is distributed on all working components. Therefore, a failure rate of each component is changeable during run of the system and depends on a number of working elements at this point in time. As a model of the system failures we construct a stochastic process which value at the moment t denotes the number of working components. Generally it is neither Markov nor semi-Markov process. To assess the reliability characteristics of the system we simulate this stochastic process using the Monte-Carlo method and we calculate values of nonparametric kernel density and reliability functions estimators.
    Źródło:
    Journal of Polish Safety and Reliability Association; 2016, 7, 1; 67--72
    2084-5316
    Pojawia się w:
    Journal of Polish Safety and Reliability Association
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The technical object reliability evaluation based on the parametric and momentary failures
    Autorzy:
    Lindstedt, P.
    Manerowski, J.
    Borowczyk, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/242760.pdf
    Data publikacji:
    2016
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    reliability
    Weibull function
    parametric failure
    momentary failure
    Opis:
    The presented paper concerns with the technical object reliability evaluation based on the parametric and momentary failures during the process of object operating. The real world data observation shows that in the case of high quality technical objects the catastrophic failure events are too rare to the credible evaluation of the object’s reliability. For that reason, the parametric and momentary failures are in the centre of attention in this paper. The set of analysed failures was obtained with the classifiers of the field data provided by the monitoring system (the failure alarms) and the diagnostic system (the functional and technical condition parameters deviation). The changes of the functioning condition potential are used to determine the symptoms of momentary failures and the changes in the potential of the technical condition to determine the symptoms of parametric failures (non-total). The assumed reliability characteristics model has the form R(t) = f(_, Rb(t), Rc(t)), (where: Rb(t) and Rc(t) – the estimators of reliability for parametric and momentary failures, symbol ‘_’ denotes catastrophic failures not covered). For the identification of R (t) as an analytical function, the estimators are computed with the field data. The Weibull distribution function due to its flexibility is often used. Such is the case in this paper. Two parameters a and b known as the scale and the shape parameters are estimated with the computerized procedure realizing least-square method. The presented examples show good fit quality even for small set of data.
    Źródło:
    Journal of KONES; 2016, 23, 2; 239-246
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Using the Weibull ++ software in water supply network failure analysis
    Autorzy:
    Żywiec, Jakub
    Powiązania:
    https://bibliotekanauki.pl/articles/105442.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Rzeszowska im. Ignacego Łukasiewicza. Oficyna Wydawnicza
    Tematy:
    failure
    reliability
    water supply
    Weibull++
    zaopatrzenie w wodę
    niezawodność
    uszkodzenie
    Opis:
    The water supply network is a basic element of the water distribution subsystem and its task is to provide consumers with water of appropriate quality, in the required quantity, under appropriate pressure, at any time and at an acceptable price. To fulfil these tasks, the water supply network should have an appropriate level of operational reliability. The paper presents an analysis of the causes of water pipes failures using the Weibull++ software. The analysis was based on the operational data from 2018 obtained from the water supply company. The data included the failure book specifying the date and place of the failure, the cause of the failure, diameter and material of the damaged pipe. The probability density function for the failure of water pipes and its cumulative distribution function have been determined. The impact of individual types of failure causes on the failure of the water supply network was determined. The results provide information about the probability of failures of the water supply network depending on their cause. These results can be used in further analyses of the reliability and safety of water supplies to consumers.
    Źródło:
    Czasopismo Inżynierii Lądowej, Środowiska i Architektury; 2019, 66, 3; 37-45
    2300-5130
    2300-8903
    Pojawia się w:
    Czasopismo Inżynierii Lądowej, Środowiska i Architektury
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Bayesian reliability models of Weibull systems: State of the art
    Autorzy:
    Zaidi, A.
    Ould Bouamama, B.
    Tagina, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/330104.pdf
    Data publikacji:
    2012
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    modelowanie hierarchiczne
    system Weibulla
    sieci bayesowskie
    diagnostyka uszkodzeń
    hierarchical modeling
    reliability
    Weibull
    Bayesian networks
    fault diagnosis
    Opis:
    In the reliability modeling field, we sometimes encounter systems with uncertain structures, and the use of fault trees and reliability diagrams is not possible. To overcome this problem, Bayesian approaches offer a considerable efficiency in this context. This paper introduces recent contributions in the field of reliability modeling with the Bayesian network approach. Bayesian reliability models are applied to systems with Weibull distribution of failure. To achieve the formulation of the reliability model, Bayesian estimation of Weibull parameters and the model's goodness-of-fit are evoked. The advantages of this modelling approach are presented in the case of systems with an unknown reliability structure, those with a common cause of failures and redundant ones. Finally, we raise the issue of the use of BNs in the fault diagnosis area.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2012, 22, 3; 585-600
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Reliability Assessment of Main Engine Subsystems Considering Turbocharger Failure as a Case Study
    Autorzy:
    Anantharaman, M.
    Khan, F.
    Garaniya, V.
    Lewarn, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/116356.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    main engine
    main propulsion
    turbocharger
    turbocharger failure
    main propulsion engine
    Markov model
    Weibull failur model
    reliability
    Opis:
    Safe operation of a merchant vessel is dependent on the reliability of the vessel’s main propulsion engine. Reliability of the main propulsion engine is interdependent on the reliability of several subsystems including lubricating oil system, fuel oil system, cooling water system and scavenge air system. Turbochargers form part of the scavenge sub system and play a vital role in the operation of the main engine. Failure of turbochargers can lead to disastrous consequences and immobilisation of the main engine. Hence due consideration need to be given to the reliability assessment of the scavenge system while assessing the reliability of the main engine. This paper presents integration of Markov model (for constant failure components) and Weibull failure model (for wearing out components) to estimate the reliability of the main propulsion engine. This integrated model will provide more realistic and practical analysis. It will serve as a useful tool to estimate the reliability of the vessel’s main propulsion engine and make efficient and effective maintenance decisions. A case study of turbocharger failure and its impact on the main engine is also discussed.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2018, 12, 2; 271-276
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Bayes statistical decisions with random fuzzy data – an application for the Weibull distribution
    Rozmyto-bayesowski model podejmowania decyzji statystycznych – zastosowanie do rozkładu Weiulla
    Autorzy:
    Hryniewicz, O.
    Kaczmarek, K.
    Nowak, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/302140.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
    Tematy:
    Bayesian statistics
    fuzzy data
    possibility measures
    reliability
    Weibull distribution
    statystyka bayesowska
    dane rozmyte
    miary możliwości
    niezawodność
    rozkład Weibulla
    Opis:
    In the majority of decision models used in practice all input data are assumed to be precise. This assumption is made both for random results of measurements, and for constant parameters such as, e.g. costs related to decisions. In reality many of these values are reported in an imprecise way. When this imprecision cannot be related to randomness the fuzzy set theory yields tools for its description. It seems to be important to retain both types of uncertainty, random and fuzzy, while building mathematical models for making decisions. In the paper we propose a fuzzy-Bayesian model for making statistical decisions. In the proposed model the randomness of data is reflected in related risks, and fuzziness is described by possibility measures of dominance such as PSD (Possibility of Strict Dominance) and NSD (Necessity of Strict Dominance). The proposed model allows a decision-maker to reflect in his/hers decisions different types of uncertainty. The theoretical results have been applied in the case of reliability data described by the Weibull distribution.
    W większości stosowanych w praktyce modeli decyzyjnych zakłada się, że wszystkie występujące w nich dane wejściowe są podane w sposób precyzyjny. Założenie to dotyczy zarówno losowych wyników pomiarów jak też i stałych parametrów, takich jak np. koszty podjętych decyzji. W rzeczywistości wiele z tych wartości jest podawanych w sposób nieprecyzyjny. Jeżeli taki brak precyzji nie ma charakteru losowego, to teoria zbiorów rozmytych dostarcza narzędzi do opisu tego zjawiska. Wydaje się rzeczą istotną, by przy tworzeniu matematycznych modeli podejmowania decyzji zachować oba typy niepewności: losowość i rozmytość. W pracy proponujemy rozmyto-bayesowski model podejmowania decyzji statystycznych. W proponowanym modelu losowość odpowiada za związane z podjęciem decyzji ryzyko, zaś rozmytość jest opisana przez miary możliwości dominacji, takie jak PSD (Możliwość Ścisłej Dominacji) oraz NSD (Konieczność Ścisłej Dominacji). Zaproponowany model pozwala decydentowi ująć w procesie podejmowania decyzji różne rodzaje niepewności. Rozważania teoretyczne zostały w pracy zastosowane do analizy danych niezawodnościowych opisanych rozkładem Weibulla.
    Źródło:
    Eksploatacja i Niezawodność; 2015, 17, 4; 610-616
    1507-2711
    Pojawia się w:
    Eksploatacja i Niezawodność
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Influence of Chosen Abrasive Wear Parameters on Fault-free Operation Time of the Cylinder-Piston System
    Autorzy:
    Piątkowski, J.
    Mesjasz, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/382390.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    reliability
    Weibull analysis
    hypereutectic Al-Si alloy
    regress analysis
    correlation analysis
    niezawodność
    analiza Weibulla
    stop nadeutektyczny Al-Si
    analiza regresji
    analiza korelacji
    Opis:
    In the paper the method of data modeling for damages, that has values higher than zero, is being shown. With the use of Weibull distribution, with prior regression and correlation analysis, the chosen parameters, that define durability and break down level of two populations of AlSi17Cu5Mg, were set. The calculation sheet that is shown for reliability allows the creation of so called survival chart, and on the basis of durability data the average warrantee time can be defined at the pre-exploitation stage.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 3 spec.; 69-72
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    ‘‘Slip and Fall’’ Theory - Extreme Order Statistics
    Autorzy:
    Barnett, R. L.
    Powiązania:
    https://bibliotekanauki.pl/articles/89884.pdf
    Data publikacji:
    2002
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    slips and falls
    extreme value statistics
    human locomotion
    friction
    slipperiness
    Weibull
    reliability
    zabezpieczenia
    upadek
    tarcie
    zagrożenia zdrowia
    wypadki przy pracy
    mata antypoślizgowa
    Opis:
    Classical ‘‘slip and fall’’ analysis was reformulated in this paper to account for the stochastic nature of friction. As it turned out, the new theory, arising from this analysis, was a precise statement of the distribution function for the smallest value among n independent observations. This made it possible to invoke an important result from the asymptotic theory of extreme order statistics that reduced the theory to a simple and elegant relationship among the probability of slipping, the critical friction criterion, the distance traveled by the walker, and the average, spread and asymmetry of the distribution of friction coefficients. The new theory reveals that short walks lead to fewer falls; low friction floors are sometimes better than high friction ones.
    Źródło:
    International Journal of Occupational Safety and Ergonomics; 2002, 8, 2; 135-158
    1080-3548
    Pojawia się w:
    International Journal of Occupational Safety and Ergonomics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Data Simulation with the Use of Weibull Analysis for Evaluation of Reliability of Chosen Assortment
    Autorzy:
    Piątkowski, J.
    Mesjasz, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/381866.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    reliability
    Weibull analysis
    hypereutectic Al-Si cast alloy
    regression analysis
    correlation analysis
    niezawodność
    analiza Weibulla
    stop nadeutektyczny Al-Si
    analiza regresji
    analiza korelacyjna
    Opis:
    In the dissertation the data modeling has been shown for the data that regards the damages, which value is above zero. With the use of Weibull distribution, with prior regression and correlation analysis chosen parameters that defines the life time and failure level of two populations of AlSi17Cu5 were defined. The calculation sheet of reliability allows to create so called survival diagram, and on the basis of durability data the average warrantee can be determined, on the pre-exploitation period.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 3; 47-50
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

      Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies