Temat: weibull - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: The Weibull lifetime model with randomised failure-free time
Autorzy:: Sulewski, Piotr
Szymkowiak, Magdalena
Tematy:: Weibull lifetime model
randomised failure-free time
compound Weibull distributions; Pokaż więcej
Data publikacji:: 2022-12-15
Powiązania:: https://bibliotekanauki.pl/articles/2156948.pdf Link otwiera się w nowym oknie
Źródło:: Statistics in Transition new series; 2022, 23, 4; 59-76
1234-7655
Pojawia się w:: Statistics in Transition new series
Opis:: The paper shows that treating failure-free time in the three-parameter Weibull distribution not a constant, but as a random variable makes the resulting distribution much more flexible at the expense of only one additional parameter.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Prediction model of the pandemic spreading based on weibull distribution
Autorzy:: Guľáš, Ľuboš
Talian, Matej
Szabo, Stanislav
Semrádová, Beáta
Tematy:: pandemics
prediction model
weibull distribution; Pokaż więcej
Data publikacji:: 2022
Powiązania:: https://bibliotekanauki.pl/articles/2204124.pdf Link otwiera się w nowym oknie
Źródło:: Management Systems in Production Engineering; 2022, 2 (30); 179--186
2299-0461
Pojawia się w:: Management Systems in Production Engineering
Opis:: Pandemics have the potential to cause immense disruption of our everyday activities and has impact on the communities and societies mainly through the restrictions applied to the business activities, services, manufacturing, but also education, transportation etc. Therefore, it is important to create suitable prediction models to establish convenient methods for the planning of the operations and processes to cope with the difficulty. In this paper, the prediction model for the spread of the viral disease in term of the estimated maximal weekly confirmed cases and weekly deaths using the Weibull distribution as a theoretical model for statistical data processing is presented. The theoretical prediction model was applied and confirmed on the data available for the whole world and compared to the situation in Europe and Slovakia for the pandemic waves and can be used for the more precise prediction of the pandemic situation and to enhance planning of the activities and processes regarding to the restrictions applied during the worsening pandemic situation.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Monte Carlo method for reliability of parallel system with dependent failures of component
Autorzy:: Grabski, F.
Tematy:: reliability
stochastic process
Weibull distribution
dependency; Pokaż więcej
Data publikacji:: 2016
Powiązania:: https://bibliotekanauki.pl/articles/2069174.pdf Link otwiera się w nowym oknie
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
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Reliability of a Collective Wastewater Treatment Plant
Autorzy:: Bugajski, P.
Chmielowski, K.
Kaczor, G.
Tematy:: wastewater treatment plant
technological reliability
Weibull theory; Pokaż więcej
Data publikacji:: 2016
Powiązania:: https://bibliotekanauki.pl/articles/125059.pdf Link otwiera się w nowym oknie
Źródło:: Journal of Ecological Engineering; 2016, 17, 4; 143-147
2299-8993
Pojawia się w:: Journal of Ecological Engineering
Opis:: The paper discusses technological reliability of a collective wastewater treatment plant (WTP). The WTP capacity expressed as population equivalents (PE) was 22,500. The research was conducted in 2013 and 2014 and it involved the collection and physical and chemical analysis of 101 samples of raw and treated sewage. Reliability analysis was based on Weibull reliability theory. Reliability of retaining organic compounds defined as BOD5 was 68%, and for biogenic compounds, such as total nitrogen and total phosphorus, it was 92% and 88%, respectively.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Estimating parameters of the Weibull diameter distribution for Gmelina arborea in Nimbia Forest Reserve, Nigeria
Autorzy:: Shamaki, S. B.
Akindele, S. O.
Marshall, P. L.
LeMay, V. M.
Tematy:: Gmelina arborea
Nimbia Forest Reserve
Weibull distribution; Pokaż więcej
Data publikacji:: 2019
Powiązania:: https://bibliotekanauki.pl/articles/1075794.pdf Link otwiera się w nowym oknie
Źródło:: World Scientific News; 2019, 118; 209-219
2392-2192
Pojawia się w:: World Scientific News
Opis:: Parameters of the Weibull diameter distribution were estimated for Gmelina (Gmelina arborea) plantation in Nimbia Forest Reserve. Stratified random sampling was employed to select five plots of 20 × 20 m from each forest bit that serves as management unit, thereby having a total of 20 plots for the study. Stump diameter (Dst), diameter at breast height (Dbh), diameter at middle and top positions (Dm and Dt) of trees, and tree height for all the selected trees were measured. Average Dbh measured was 16.33 cm and the mean tree height 6.85 m. Pseudo coefficient of determination (Pseudo R2), residual mean square error, Anderson-Darling, and Kolmogorov-Smirnov goodness-of-fit statistics were considered as model selection criteria. Weibull cumulative density function (Weibull-CDF) was the best fit method for Gmelina compared with the Weibull probability density function based on the goodness-of-fit statistics generated. The diameter distribution models produced are considered only efficient for tree stands of seven years rotation age, while additional site factors like spacing, density and silvicultural treatments are required for better models, hence the need for establishing permanent sample plots (PSP) in order to get additional information from re-measurements of the plots.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: The technical object reliability evaluation based on the parametric and momentary failures
Autorzy:: Lindstedt, P.
Manerowski, J.
Borowczyk, H.
Tematy:: reliability
Weibull function
parametric failure
momentary failure; Pokaż więcej
Data publikacji:: 2016
Powiązania:: https://bibliotekanauki.pl/articles/242760.pdf Link otwiera się w nowym oknie
Źródło:: Journal of KONES; 2016, 23, 2; 239-246
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Numerical investigation of production-related characteristics regarding their influence on the fatigue strength of additively manufactured components
Autorzy:: Zeißig, Michaela
Jablonski, Frank
Tematy:: additive manufacturing
fatigue strength
Weibull distribution
FEM; Pokaż więcej
Data publikacji:: 2023
Powiązania:: https://bibliotekanauki.pl/articles/2204622.pdf Link otwiera się w nowym oknie
Źródło:: Acta Mechanica et Automatica; 2023, 17, 2; 288--291
1898-4088
2300-5319
Pojawia się w:: Acta Mechanica et Automatica
Opis:: In order to further enhance the application of additive manufacturing (AM) processes, such as the laser powder bed fusion (L-PBF) process, reliable material data are required. However, the resulting specimen properties are significantly influenced by the process parameters and may also vary depending on the material used. Therefore, the prediction of the final properties is difficult. In the following, the effect of residual stresses on the fatigue strength of 316L steel, a commonly used steel in AM, is investigated using a Weibull distribution. The underlying residual stress distributions as a result of the building process are approximated for two building directions using finite element (FE) models. These imply significantly different distributions of tensile and compressive residual stresses within the component. Apart from the residual stresses, the impact of the mean stress sensitivity is discussed as this also influences the predicted fatigue strength values.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Moc testu Kołmogorowa dla weryfikowania hipotezy o wykładniczym rozkładzie prawdopodobieństwa
Power Kolmogorov test to verify the hypothesis of exponential distribution
Autorzy:: Rogowski, A.
Tematy:: rozkład Weibulla
test Kołmogorowa
Weibull distribution
Kolmogorov test; Pokaż więcej
Data publikacji:: 2013
Powiązania:: https://bibliotekanauki.pl/articles/315448.pdf Link otwiera się w nowym oknie
Źródło:: Autobusy : technika, eksploatacja, systemy transportowe; 2013, 14, 3; 1193-1202
1509-5878
2450-7725
Pojawia się w:: Autobusy : technika, eksploatacja, systemy transportowe
Opis:: W artykule oszacowano metodą symulacyjną moc testu λ Kołmogorowa dla hipotezy złożonej o wykładniczym rozkładzie prawdopodobieństwa wobec hipotezy alternatywnej, że rozkład prawdopodobieństwa w populacji jest rozkładem Weibulla (dla wybranych wartości parametru kształtu i liczności próby n = 100). Obliczono również numerycznie granicę dolną mocy testu z wykorzystaniem rozkładu granicznego.
The article estimated using simulation power λ Kolmogorov test for the composite hypothesis of ex ponential probability distribution against the alternative hypothesis that the probability distribution of the population is Weibull distribution (with the selected shape parameter and sample size n=100). Also calculated numerically lower limit power test by using the limiting distribution.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Demand forecasting in a business based on experts’ opinions – an application of weibull distributions
Autorzy:: Dittmann, Paweł
Tematy:: demand
demand forecasting
experts’ opinions
Weibull distribution applications; Pokaż więcej
Data publikacji:: 2013
Powiązania:: https://bibliotekanauki.pl/articles/424785.pdf Link otwiera się w nowym oknie
Źródło:: Econometrics. Ekonometria. Advances in Applied Data Analytics; 2013, 1(39); 52-60
1507-3866
Pojawia się w:: Econometrics. Ekonometria. Advances in Applied Data Analytics
Opis:: Demand forecasts in a business may be constructed by various methods, e.g. by using Type-I formal models, or by using type-II formal models based on experts’ opinions. The experts can be the business’s managers or persons from outside of the studied business. The experts can not only construct forecasts, but also subjectively specify the probability of them coming true. In this article, the Weibull distribution is described, a distribution that may be applied in the process of constructing product demand forecasts for a business. The methodology for constructing a point forecast is explained, along with the methods for evaluating the chances of the forecast coming true and the methods for judging the probability connected with sales profitability.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Statystyczna analiza awarii pojazdów samochodowych
Failure analysis of cars
Autorzy:: RUMIANOWSKI, Roman
Tematy:: statystyka
rozkład Weilbulla
niezawodność
statistics
Weibull distribution
failure analysis; Pokaż więcej
Data publikacji:: 2016
Powiązania:: https://bibliotekanauki.pl/articles/456949.pdf Link otwiera się w nowym oknie
Źródło:: Edukacja-Technika-Informatyka; 2016, 7, 1; 13-17
2080-9069
Pojawia się w:: Edukacja-Technika-Informatyka
Opis:: Opracowanie prezentuje zastosowanie rozkładu Weibulla do analizowania częstości wystę-powania awarii w używanych samochodach osobowych. W artykule prezentowane są przykłady dystrybuanty rozkładu awaryjności dla kilku wybranych modeli samochodów.
The paper presents a model for calculating the occurrence of failures in cars using the Weibull distribution. Empirical cumulative distribution curve is analyzed for a few car models.
Dostawca treści:: Biblioteka Nauki

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