Wszystkie pola: Semi-Markov Model - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Semi-Markov model of system damage process
Autorzy:: Grabski, F.
Powiązania:: https://bibliotekanauki.pl/articles/2069526.pdf
Data publikacji:: 2011
Wydawca:: Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:: reliability
multi-state
semi-Markov
damages processes
Opis:: The reliability characteristics and parameters of multi-state systems modelled by the finite states regress characteristics and parameters of multi-state systems modelled by the finite states regress semi-Markov processes are investigated in the paper. Presented here models deal with un-repairable systems. The essential concepts of discrete states and continuous time semi-Markov process theory deliver. Mathematical apparatus for models constructions and analysis. Multi-state reliability functions and corresponding expectations, second moments and standard deviations are calculated for the presented systems.
Źródło:: Journal of Polish Safety and Reliability Association; 2011, 2, 1; 101--108
2084-5316
Pojawia się w:: Journal of Polish Safety and Reliability Association
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Semi-Markov model of multi-modal transport operation
Autorzy:: Grabski, F.
Powiązania:: https://bibliotekanauki.pl/articles/242572.pdf
Data publikacji:: 2017
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: semi-Markov model
multistage transport operation
reliability function
mean time to failure
Opis:: Multi-modal transport means the transport of the objects through at least two different carriers of any combination of simple tasks of transport carriers (by truck, by train, by ship or by plane). A Semi-Markov (SM) model of multi-modal transport operation is presented in the article. The SM process is defined by the renewal kernel of that one. In our model, time to failure of the operation is represented by a random variable that denotes the first passage time from the given state to the subset of states. The duration of one operation cycle is a random variable representing the return time to the initial state. The appropriate theorems of the Semi-Markov processes theory allow us to calculate characteristics and parameters of the transport operation model. The article presents the example of the transport operation final part of container with cargo from Warsaw to Stockholm, where from Warsaw to Gdynia, the container is transported by lorry, from Gdynia to Karlscorona by ferry and from Karlscorona to Stockholm by truck.
Źródło:: Journal of KONES; 2017, 24, 4; 47-54
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: A semi-Markov model of fuel combustion process in a diesel engine
Autorzy:: Girtler, J.
Powiązania:: https://bibliotekanauki.pl/articles/963463.pdf
Data publikacji:: 2007
Wydawca:: Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Opis:: A four-state model of the combustion process in working spaces (cylinders) of a diesel engine is presented in the form of a semi-Markov process, discrete in states and continuous in time. The values in this process are the states : s1, s2, s3, s4 corresponding to commonly accepted types of combustion in those engines, namely : s1 - the process state which corresponds to total (complete and perfect) combustion, s2 - the process state which corresponds to incomplete combustion, s3 - the process state which corresponds to imperfect combustion, and s4 - the process state which corresponds to both incomplete and imperfect combustion. It is also mentioned that proper use of diesel engines can secure a correct course of the combustion process, if it is properly attended and shaped. During this course the state s4 does not take place. Formulas are given which make it possible to determine the probability of staying of the combustion process in the above named states, along with the interpretation of the probability P1 = P(s1) as the probability of correct (reliable) engine operation.
Źródło:: Polish Maritime Research; 2007, S 1; 58-61
1233-2585
Pojawia się w:: Polish Maritime Research
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Semi-Markov model of quality state changes of a selected transport system
Autorzy:: Landowski, B.
Muślewski, Ł.
Knopik, L.
Bojar, P.
Powiązania:: https://bibliotekanauki.pl/articles/241811.pdf
Data publikacji:: 2017
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: transport system
efficiency
operation process
maintenance process
semi-Markov process
simulation tests
Opis:: The study deals with the problems connected with evaluation and analysis of transport systems operational quality. The research object is a real, sociotechnical system (of the type H-M-E) whose functional quality is affected by: operators, equipment and technical state of he operated vehicles and the environmental impact. A scheme of an assessment model was built on the basis of a developed concept of a system operational quality and a random process was defined to be used for the analysis. The assessment process involves investigating the variability degree of properties included in the resultant model in a given time and determining whether and to what degree the obtained values meet the requirements of the system appropriate operational quality. On the basis of the above assumptions and in result of experimental tests, four qualitative states of a transport system functioning, which represent intervals of values of the obtained grades in given time moments, were distinguished. The study presents a model of system operation qualitative state changes developed with the use of Markov chain inserted into a certain semi-Markov process. A graph and a matrix for probability of transition between the states were created and boundary distributions of the process were determined on the basis of experimentally obtained data. A system of equations was determined for the distinguished Markov chain, on the basis of which a mathematical model for assessment and control of operational quality of selected types of transport systems will be built.
Źródło:: Journal of KONES; 2017, 24, 4; 141-148
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: A semi-Markov model of the variability of power generation from renewable sources
Autorzy:: Malinowski, J.
Powiązania:: https://bibliotekanauki.pl/articles/406476.pdf
Data publikacji:: 2013
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: renewable power generation
forecasting of environmental conditions
semi-Markov modeling
Laplace transform
Opis:: The paper presents a new approach to modeling the variability of power generation from a renewable source such as wind or flowing water. The force of the power generating agent is assumed to change according to the semi-Markov process with finite state space. For the purpose of its construction, the range of possible values expressing the agent’s force is divided into a finite number of subintervals. It is natural to assume that the time during which the agent’s force remains within one such interval, and the probabilities of transitions to neighboring intervals depend to some extent on the agent’s earlier behavior. The model’s accuracy is determined by the number of subintervals used and the assumed degree to which the agent’s force depends on its history. This degree is expressed by the number of the most recently entered subintervals relevant to predicting the agent’s future behavior. According to the presupposed accuracy level, an appropriately complex state-space and a diagram of the inter-state transitions for the modeled process have been constructed. Subsequently, it is demonstrated how certain parameters of this process, related to forecasting power generation, can be calculated by means of the calculus of the Laplace transforms.
Źródło:: Operations Research and Decisions; 2013, 23, 2; 81-90
2081-8858
2391-6060
Pojawia się w:: Operations Research and Decisions
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Evaluation of the maintenance system readiness using the semi-Markov model taking into account hidden factors
Autorzy:: Kozłowski, Edward
Borucka, Anna
Oleszczuk, Piotr
Jałowiec, Tomasz
Powiązania:: https://bibliotekanauki.pl/articles/27322964.pdf
Data publikacji:: 2023
Wydawca:: Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:: maintenance
semi-Markov model
hidden factors
system readiness
Opis:: Modelling the time that the system remains in a given state using classical distributions is not always possible. In many cases, empirical distributions are multimodal due to the influence of external, hidden factors and the selection of the best classical distributions may lead to erroneous results. In the article the method of diagnosis of influence of hidden factors into sojourn time of semi-Markov models was presented. In order to capture hidden factors, the authors proposed to model the distributions of the sojourn time with a mixture of distributions, which is a significant novelty in relation to the studies presented in the literature. Hidden factors directly affect the reliability of technical systems. Detecting the existence of these factors enables more accurate modeling of system readiness. Paying attention to irregularities caused by hidden factors makes it possible to reduce system maintenance costs. Such a system model providescomplete information and enables a reliable assessment of the system readiness and maintenance.
Źródło:: Eksploatacja i Niezawodność; 2023, 25, 4; art. no. 172857
1507-2711
Pojawia się w:: Eksploatacja i Niezawodność
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Reliability and maintainability characteristics in semi-Markov models
Autorzy:: Grabski, F.
Powiązania:: https://bibliotekanauki.pl/articles/2069172.pdf
Data publikacji:: 2016
Wydawca:: Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:: semi-Markov model
reliability characteristics
Opis:: The characteristics of semi-Markov process we can translate on the reliability characteristics in the semi-Markov reliability model. The cumulative distribution functions of the first passage time from the given states to subset of states, expected values and second moments corresponding to them which are considered in this paper allow to define reliability function of the system. The equations for many reliability characteristics and parameters are here presented.
Źródło:: Journal of Polish Safety and Reliability Association; 2016, 7, 1; 79--86
2084-5316
Pojawia się w:: Journal of Polish Safety and Reliability Association
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Semi-Markov Reliability Model of System Composed of Main Subsystem, Cold Backup Component and Switch
Autorzy:: Grabski, F.
Powiązania:: https://bibliotekanauki.pl/articles/2068910.pdf
Data publikacji:: 2017
Wydawca:: Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:: semi-Markov model
reliability characteristics
Opis:: Probabilistic model of a system composed of a main component, an emergency backup component and the automatic switch are discussed in this paper. The reliability model is semi-Markov process describing evolution of the system. Conditional time to failure of the system is represented by a random variable denoting the first passage time of the process from the given state to the subset of states. The appropriate theorems of the Semi-Markov processes theory allow us to evaluate the reliability function and some reliability characteristics. To calculate the reliability function and mean time to failure of the system we apply theorems of the Semi-Markov processes theory concerning the conditional reliability functions.
Źródło:: Journal of Polish Safety and Reliability Association; 2017, 8, 1; 47--54
2084-5316
Pojawia się w:: Journal of Polish Safety and Reliability Association
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Application isssues of the semi-markov reliability model
Autorzy:: Rudnicki, J.
Powiązania:: https://bibliotekanauki.pl/articles/259667.pdf
Data publikacji:: 2015
Wydawca:: Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:: service speed
shipping lines
preliminary design
Opis:: Predicting the reliability of marine internal combustion engines, for instance, is of particular importance, as it makes it possible to predict their future reliability states based on the information on the past states. Correct reliability prediction is a complex process which consists in processing empirical results obtained from operating practice, complemented by analytical considerations. The process of technical state changes of each mechanical device is stochastic and continuous in states and time, hence the need to divide this infinite set of engine states into a finite number of subsets (classes), which can be clearly and permanently identified using the existing diagnosing system. Using the engine piston-crankshaft system as an example, the article presents a proposal for a mathematical model of reliability which, on the one hand, takes into account random nature of phenomena leading to the damage, and at the same time reveals certain application flexibility and the resultant practical usability.
Źródło:: Polish Maritime Research; 2015, 1; 55-64
1233-2585
Pojawia się w:: Polish Maritime Research
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Semi-Markov Model of the Operation and Maintenance Process of City Buses
Semimarkowski model procesu eksploatacji i obsługi autobusów miejskich
Autorzy:: Szubartowski, M.
Powiązania:: https://bibliotekanauki.pl/articles/223492.pdf
Data publikacji:: 2013
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: public transport bus
maintenance process
semi-Markov model
autobusowa komunikacja miejska
eksploatacja autobusów
model semi-Markowa
ocena gotowości systemu
Opis:: This paper presents a model of the operation and maintenance process of the technical objects within the urban transport bus system. All the investigations have been presented on the basis of the selected real operation and maintenance system of the city buses. Basing on the identification of the system under investigation and on the process being realized within it a model of the operation and maintenance process of the city buses was built, assuming that the model of this process is the homogeneous semi-Markov process X(t). For this purpose, crucial states of operation and maintenance process in selected transport system were determined as well as possible transfers between those states. Based on this, an event-based model of the operation and maintenance process of the city buses was built, assuming that its model is the homogenous semi-Markov process. For operation data obtained after research conducted in an authentic transport system, values of unconditional periods of duration of process states, values of stationary distribution included in the Markov chain as well as values of probabilities of limit distribution of the semi-Markov process were determined. Based on this, an analysis of the city buses operation and maintenance process in question was performed. Presented in this article the semi-Markov model operation and maintenance process of city buses is the first stage of the creation of the availability model of the urban transport bus system.
W artykule przedstawiono model procesu eksploatacji obiektów technicznych w systemie autobusowej komunikacji miejskiej. Całość rozważań przedstawiono na przykładzie wybranego rzeczywistego systemu eksploatacji autobusów miejskich. Na podstawie identyfikacji badanego systemu i realizowanego w nim procesu zbudowano model procesu eksploatacji autobusów miejskich, zakładając, że modelem tego procesu jest jednorodny proces semi-Markowa X(t). W tym celu wyznaczono istotne stany procesu eksploatacji realizowanego w wybranym systemie transportowym oraz możliwe przejścia między wyróżnionymi stanami. Na tej podstawie zbudowano zdarzeniowy model procesu eksploatacji autobusów miejskich, a następnie matematyczny model tego procesu, zakładając, że jego modelem jest jednorodny proces semi-Markowa. Dla danych eksploatacyjnych, uzyskanych z badań przeprowadzonych w rzeczywistym systemie transportowym, wyznaczono wartości bezwarunkowych czasów trwania stanów procesu, wartości rozkładu stacjonarnego włożonego w proces łańcucha Markowa oraz wartości prawdopodobieństw rozkładu granicznego procesu semi-Markowa. Na tej podstawie dokonano analizy rozpatrywanego procesu eksploatacji autobusów miejskich. Prezentowany w artykule semimarkowski model procesu eksploatacji autobusów miejskich jest pierwszym etapem budowy modelu oceny gotowości systemu autobusowej komunikacji miejskiej.
Źródło:: Archives of Transport; 2013, 25-26, 1-2; 109-116
0866-9546
2300-8830
Pojawia się w:: Archives of Transport
Dostawca treści:: Biblioteka Nauki

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