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Wyświetlanie 1-15 z 56
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:
Mean time to failure for periodic failure rate
Autorzy:
Tanguy, C.
Powiązania:
https://bibliotekanauki.pl/articles/2069664.pdf
Data publikacji:
2009
Wydawca:
Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:
reliability
mean time to failure
periodic failure rate
Opis:
The paper is concerned with the determination of the Mean Time To Failure (MTTF) in configurations where the failure rate is periodical. After solving two configurations exactly, we show that when the period of the failure rate oscillations is small with respect to the average failure rate, the MTTF is essentially given by the inverse of the average failure rate, give or take corrections that can be expressed analytically. This could be helpful in the description of systems the environment of which is subject to changes.
Źródło:
Journal of Polish Safety and Reliability Association; 2009, 2; 361--366
2084-5316
Pojawia się w:
Journal of Polish Safety and Reliability Association
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A topological model to assess networks connectivity and reliability
Autorzy:
Eid, M.
Hami-EL, A.
Souza de Cursi, E.
Powiązania:
https://bibliotekanauki.pl/articles/2069197.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:
network
connectivity
failure
reliability
availability
Opis:
The acceleration of the interconnectivity of networks of all sorts brings to the front scene the issue of networks performance measure. Recently, one observed an accelerating course towards quantitative probabilistic models to describe and assess networks’ Connectivity, as being the main vector of performance. However, modelling realistic networks is still far from being satisfactorily achieved using quantitative probabilistic models. On the other hand, little room had been lift to exploring the potential of topological models to develop qualitative and semi- quantitative models in order to assess networks connectivity. In this paper, we are exploring the potential of the topological modelling. The proposed model is based on describing the nodepair connectivity using binary scalars of different orders (tensors). Preliminary results of our explorations sounded very promoting.
Źródło:
Journal of Polish Safety and Reliability Association; 2013, 4, 2; 167--178
2084-5316
Pojawia się w:
Journal of Polish Safety and Reliability Association
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reliability Design of Complex Systems by Minimizing the Lifetime Variance
Autorzy:
Łobos, E.
Momot, M.
Powiązania:
https://bibliotekanauki.pl/articles/908509.pdf
Data publikacji:
2002
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
matematyka
reliability
constant failure rate
redundancy
Opis:
The problem considered in this paper is the minimization of the lifetime variance of a complex system subject to its expected life and economic constraints. The example of a bridge network, in which all elements have constant failure rates, illustrates the problem. A numerical algorithm for solving this optimization problem by using exact formulae for system lifetime moments is included. Using this algorithm, we can obtain results better than the solutions known from earlier papers.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2002, 12, 4; 553-557
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Czynniki wpływające na niezawodność pracy sieci dystrybucyjnych
Factors influencing the reliability of distribution grids
Autorzy:
Wnukowska, Bogumiła
Powiązania:
https://bibliotekanauki.pl/articles/34105735.pdf
Data publikacji:
2023-09-30
Wydawca:
Collegium Witelona Uczelnia Państwowa
Tematy:
niezawodność
energia
awaria
reliability
energy
failure
Opis:
Jednym z najważniejszych zagadnień związanych z niezawodnością zasilania odbiorców jest sprawne funkcjonowanie sieci dystrybucyjnej. W pracy omówiono najważniejsze elementy elektroenergetycznej sieci dystrybucyjnej średniego napięcia. Przedstawiono przypadki awarii oraz ich wpływ na odbiorców energii elektrycznej oraz powstałe skutki. Praca zawiera analizę przyczyn powodujących awarie sieci dystrybucyjnej, dokonaną na podstawie dostępnych materiałów źródłowych oraz oddziaływanie awarii na odbiorców energii elektrycznej, a także na bezpieczeństwo energetyczne kraju.
One of the main problems connected with energy supply reliability is the efficient functioning of distribution grids. This paper discusses major elements of a medium voltage electric grid. It also presents cases of its failure as well as their outcomes and influence on energy consumers. This paper contains an analysis of the causes of distribution grid failure based on the available source materials and its consequences consumers as well as energy security of countries.
Źródło:
Zeszyty Naukowe Collegium Witelona; 2023, 3, 48; 11-26
2956-302X
2956-3208
Pojawia się w:
Zeszyty Naukowe Collegium Witelona
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Implementation of RCM theory in air operations
Autorzy:
Bugaj, M.
Powiązania:
https://bibliotekanauki.pl/articles/393850.pdf
Data publikacji:
2011
Wydawca:
Polskie Stowarzyszenie Telematyki Transportu
Tematy:
konserwacja
awarie
niezawodność
maintenance
reliability
failure
Opis:
Reliability-Centred Maintenance (RCM) implementation provides measures that signify progress towards implementing an RCM based maintenance program. Using numbers identified during the Analysis Phase as a basis, the metrics concentrate on the number and percentage of each category (new task, modified task, cancellation of specified old program tasks, design modifications, operational procedure changes, etc., that have actually been implemented. Implementation will (or should) usually begin during the Analysis Phase of an RCM project, and may provide information for improvement of the analysis. Implementation involves many activities, such as: Identification of resources (money, time, manpower), Coordination with governing authorities or other parties affected, Procedure writing, walk down and approval, Procurement of special tools, parts and consumables needed to carry out the procedures mandated under the new program, Training or at least orientation on the new procedures for those who are to perform them, Planning and scheduling of new RCM based procedures, Actual execution the first time on the asset that was subject of the RCM Project.
Źródło:
Archives of Transport System Telematics; 2011, 4, 1; 13-17
1899-8208
Pojawia się w:
Archives of Transport System Telematics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Physical and reliability aspects of failure in mechanical objects
Autorzy:
Młyńczak, M.
Powiązania:
https://bibliotekanauki.pl/articles/2069670.pdf
Data publikacji:
2009
Wydawca:
Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:
physical degradation
mechanical object
reliability
failure
Opis:
Mechanical objects are operated in real world where degradation of material components and variability of processes managed by a man are the main factors influencing its efficiency. Machine degradation is a longlasting process concerning its material structure, components and connections. Loss of machine operations ability is due to failures caused by wear and tear, fatigue, corrosion, overloading, material ageing and many other destructive processes. It is observed close relation between failure modes and reliability models so that knowledge about failures may help analysts creating reliability models and determine the best operational decisions. In the paper it is discussed relation between physical phenomenon and theoretical models as a common platform of decision processes.
Źródło:
Journal of Polish Safety and Reliability Association; 2009, 2; 317--324
2084-5316
Pojawia się w:
Journal of Polish Safety and Reliability Association
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A novel logic-based approach for failure modes mitigation control and quantitative system reliability analyses
Oryginalna, oparta na logice metoda kontroli ograniczania przyczyn uszkodzeń i ilościowej analizy niezawodności systemu
Autorzy:
Yang, D.
Ren, Y.
Wang, Z.
Liu, L.
Sun, B.
Powiązania:
https://bibliotekanauki.pl/articles/301303.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
failure
reliability
failure mitigation control
quantitative reliability analyses
uszkodzenie
niezawodność
kontrola ograniczania uszkodzeń
ilościowe analizy niezawodności
Opis:
The core idea of reliability design is to mitigate the product’s failure modes. However, for the cross-links among potential failure modes of a complex product, it is very difficult to establish the mapping relationship between failure modes mitigation and quantitative values of reliability, and the decision of failure modes mitigation have to be performed by virtue of experience, which always increase design period. In order to solve these problems, a novel logic-based approach for failure modes mitigation control and quantitative system reliability analyses is provided. Firstly, a hybrid of active and passive control process of reliability design is proposed. Secondly, a novel concept of failure modes correlation set (FMCS) and a determination approach based on deductive theory are presented. According to the changes in failure modes probabilities of occurrence, the reliability formulas of the components and assemblies are provided to depict the effects of failure mode mitigation on reliability of components and assemblies. And then the FMCS mitigation sequence is decided to determine reliability design activities. Thirdly, a closed control process of FMCS mitigation is provided integrated with logic decision method. By exposing the design of a helicopter fuel system, the present study demonstrates that all approaches are feasible, and the relationship between reliability parameters and qualitative design exists. Hence the failure modes mitigation could be controlled for the achievement of quantitative reliability requirements.
Podstawowym problemem w procesie projektowania niezawodności jest ograniczenie przyczyn uszkodzeń produktu. Jednakże, w przypadku sieci połączeń pomiędzy możliwymi przyczynami uszkodzeń złożonego produktu, trudno jest ustalić mapę zależności pomiędzy ograniczaniem przyczyn uszkodzeń i ilościowymi wartościami niezawodności, a decyzje względem ograniczania przyczyn uszkodzeń muszą bazować na własnym doświadczeniu, co znacznie wydłuża okres projektowania. W celu rozwiązania powyższych problemów, zaproponowano oryginalną, opartą na logice, metodę kontroli ograniczania przyczyn uszkodzeń i ilościowej analizy niezawodności systemu. Na wstępie, zaproponowano mieszany proces aktywnej i pasywnej kontroli niezawodności projektu. Następnie, zaprezentowano oryginalną koncepcję zbioru korelacji przyczyn uszkodzeń (FMCS) i metodę oznaczania opartą o teorię dedukcji. Na podstawie zmian dotyczących prawdopodobieństwa występowania przyczyn uszkodzeń, określono wzory niezawodności części i układów w celu pokazania wpływu ograniczania przyczyn uszkodzeń na niezawodność części i układów. Określono następnie ograniczającą sekwencję FMCS, ażeby ustalić założenia dla projektowania niezawodności. Na koniec zaprezentowano zamknięty proces kontroli ograniczania FMCS w powiązaniu z logiczną metodą podejmowania decyzji. Analizując pod tym kątem projekt systemu paliwowego helikoptera, wykazano w niniejszej pracy przydatność wszystkich powyższych metod, jak również związek pomiędzy parametrami niezawodności a projektowaniem jakościowym. Dlatego też ograniczanie przyczyn uszkodzeń powinno być kontrolowane w celu osiągnięcia wymaganej niezawodności ilościowej.
Źródło:
Eksploatacja i Niezawodność; 2015, 17, 1; 100-106
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development of an innovative approach for complex, causally determined failure chains
Autorzy:
Bielefeld, O.
Dransfeld, H.
Schlüter, N.
Winzer, P.
Powiązania:
https://bibliotekanauki.pl/articles/407289.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
model-based failure analysis
reliability
quality
safety
Opis:
A high number of examples in today’s global industry prove that it is difficult to ensure a certain level of quality. One possible reason is the increasing complexity of modern mechatronic product systems. Interface problems due to several involved science disciplines and the lack of understanding subsystems, which are delivered by different suppliers, make it difficult to identify critical components and specifications of elements. Furthermore, it is even harder to estimate the effects of elements because of their unknown dependencies and relations. Therefore it becomes more and more improbable to develop a safe, sustainable and high quality product right from the beginning. In order to understand failures in complex system structures today’s engineering industries need a generic approach that increases the understanding of systems, identifies critical components and considers the different levels of a system. It shall examine failures that cause system errors but also failures that limit system functions. Thus, it is necessary to model and simulate the causally failure chains and analyse over several system levels and elements with their dependencies. This leads to a better understanding of the whole picture of cause and effect. This research paper points out which requirements this new model-based approach has to fulfill and how it is possible to link quality and reliability methods to achieve an overall understanding and analysis of a complex system to assure high quality and sustainability.
Źródło:
Management and Production Engineering Review; 2017, 8, 3; 3-12
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badanie charakterystyk eksploatacyjnych uszkodzeń pojazdów kołowych
Research of exploitation failure characteristics of wheeled vehicles
Autorzy:
Goliasz, Tomasz
Pszczółkowski, Józef
Powiązania:
https://bibliotekanauki.pl/articles/315620.pdf
Data publikacji:
2019
Wydawca:
Instytut Naukowo-Wydawniczy "SPATIUM"
Tematy:
uszkodzenie
niezawodność
system obsługiwania
failure
reliability
exploitation
Opis:
W artykule dokonano oceny charakteru zdarzeń eksploatacyjnych polegających na wystąpieniu w pojeździe awarii wymagającej wykonania naprawy bieżącej. Zbudowano empiryczne charakterystyki uszkodzeń badanej grupy pojazdów w wybranym wojskowym systemie eksploatacji. Dokonano oceny zgodności empirycznych rozkładów z rozkładem wykładniczym i normalnym. Porównanie zostało wykonane na podstawie testu zgodności chi kwadrat. Zwrócono uwagę na potrzebę umiejętnego budowania baz danych eksploatacyjnych w celu wykorzystania ich do badania procesów eksploatacyjnych flot pojazdów na małą i dużą skalę.
The article is dedicated to utilization of cars and small buses. It includes three parts. In the first one authors consider general rules regarding creating equipment utilization data bases and how it may be used regarding reliability methods. There is mentioned that it is crucial regarding optimization of all processes in enterprises. In the second part there are presented some results regarding exploitation of technical objects. The results are much more interested because same mathematical and statistical methods were used to present them in the article. The third part is conclusion regarding all methods and results received during analysis.
Źródło:
Autobusy : technika, eksploatacja, systemy transportowe; 2019, 20, 1-2; 203-210
1509-5878
2450-7725
Pojawia się w:
Autobusy : technika, eksploatacja, systemy transportowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Towards the development of a topological model to assess networks performance : connectivity, robustness and reliability
Autorzy:
Eid, M.
Cursi-Eduardo-de, S.
EL Hami, A.
Powiązania:
https://bibliotekanauki.pl/articles/2069415.pdf
Data publikacji:
2012
Wydawca:
Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:
network
robustness
connectivity
reliability
failure
critical states
Opis:
Networks are the widest spreading system which Mankind has ever developed, today. New needs, services, and use are created each day where network systems represent the most critical aspect. Additionally, the interconnection between networks of different types is growing as never. This acceleration of interconnection of all sorts brings to the front scene the issue of performance measure in networks design and operation. For that purpose, engineers are orienting their major efforts towards the development of methods, models and codes to assess and measure networks performance in terms of probability of being connected. From this stand point of view, the engineers’ attention is mainly focused on defining the network “Connectivity” and measuring it, in different manner, using probabilities. Subsequently, we are observing an accelerating course towards quantitative probabilistic models to describe and assess networks’ Connectivity, since the sixties. Modelling realistic networks is still far from being satisfactorily achieved using quantitative probabilistic models. On the other hand, little room has been lift to exploring the potential of graphical and topological models to develop qualitative and semi- quantitative models in order to assess networks performance. In this paper, we have tried to explore the potential of the topological modelling and are proposing an original one. The proposed model is still in its earliest phase of development. But, it sounds very promoting at that stage of maturation. According to this model, the term “performance” may be extended, beyond the “connectivity probabilistic concept”, to “robustness” and to a “deepest insight” of the “connectivity concept” itself. The impact is immediate on the way the “reliability concept” would be extended to cover network systems.
Źródło:
Journal of Polish Safety and Reliability Association; 2012, 3, 1; 21--38
2084-5316
Pojawia się w:
Journal of Polish Safety and Reliability Association
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The random failure rate
Autorzy:
Grabski, F.
Powiązania:
https://bibliotekanauki.pl/articles/2069577.pdf
Data publikacji:
2007
Wydawca:
Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:
reliability
random failure rate
semi-Markov process
Opis:
A failure rate of the object is assumed to be a stochastic process with nonnegative, right continuous trajectories. A reliability function is defined as an expectation of a function of a random failure rate process. The properties and examples of the reliability function with the random failure rate are presented in the paper. A semi-Markov process as the random failure rate is considered in this paper.
Źródło:
Journal of Polish Safety and Reliability Association; 2007, 1; 143--149
2084-5316
Pojawia się w:
Journal of Polish Safety and Reliability Association
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reliability Evaluation of Transmission Planetary Gears “bottom-up” approach
Autorzy:
Živković, Predrag
Milutinović, Miroslav
Tica, Milan
Trifković, Spasoje
Čamagić, Ivica
Powiązania:
https://bibliotekanauki.pl/articles/24200801.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
planetary gear
failure rate
reliability
bottom-up
Opis:
The reliability study is the most important part of the engineering design process, as it is the basis of analysis and assessment of future product performance in exploitation. Since performance cannot be predicted with absolute certainty, the application of reliability theory includes probability theory and unreliability modeling. The proposed approach has been applied to assess the reliability of gear planetary power transmissions. The assessment of system reliability was determined on the basis of the block diagram method, as a function of the reliability of individual components, calculated by statistical analysis. Using the Weibull model, the reliability of the planetary gear was defined on the basis of the probability of failure of the gear teeth and the results were interpreted to assess the reliability of the component and the entire planetary train. For a more precise assessment of reliability and to avoid modeling every failure and mode of occurrence, a competitive risk model was developed. The reliability assessment study was conducted with a “bottom-up” approach. Reliability has been assessed, for instantaneous, estimated and assigned failures rate of planetary train and component.
Źródło:
Eksploatacja i Niezawodność; 2023, 25, 1; art. no. 2
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Time-dependant modelling of systems: some open questions
Autorzy:
Eid, M.
Powiązania:
https://bibliotekanauki.pl/articles/2069534.pdf
Data publikacji:
2011
Wydawca:
Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:
system
reliability
failure
state
critical
transition
Boolean
graph
Opis:
Time dependent modelling of complex system is one of the important topics in system reliability engineering. Although system complexity is increasing, the existing models are numerically satisfactory. However, some formal development is still lacking in reliability theory. A full system time-dependency modelling and analysis is not possible without some formal answers on critical transitions and related issues. This is still one of the open questions in system reliability theory. Some promising development relative to critical states is given in this paper with an application case.
Źródło:
Journal of Polish Safety and Reliability Association; 2011, 2, 1; 83--94
2084-5316
Pojawia się w:
Journal of Polish Safety and Reliability Association
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Time-dependant modelling of systems : some open questions
Autorzy:
Eid, M.
Powiązania:
https://bibliotekanauki.pl/articles/2069573.pdf
Data publikacji:
2007
Wydawca:
Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:
system
reliability
failure
critical state
transition
Boolean
graph
Opis:
Time dependent modelling of complex system is one of the important topics in system reliability engineering. Although system complexity is increasing, the existing models are numerically satisfactory. However, some formal development is still lacking in reliability theory. A full system time-dependency modelling and analysis is not possible without some formal answers on critical transitions and related issues. This is still one of the open questions in system reliability theory. Some promising development relative to critical states is given in this paper with an application case.
Źródło:
Journal of Polish Safety and Reliability Association; 2007, 1; 97--107
2084-5316
Pojawia się w:
Journal of Polish Safety and Reliability Association
Dostawca treści:
Biblioteka Nauki
Artykuł
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