Temat: Semi-Markov process - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Safety and risk evaluation of Stena Baltica ferry in variable operation conditions
Autorzy:: Kołowrocki, K.
Soszyńska, J.
Powiązania:: https://bibliotekanauki.pl/articles/2069680.pdf
Data publikacji:: 2009
Wydawca:: Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:: safety function
operation process
semi-markov process
Opis:: Basic safety structures of multi-state systems of components with degrading safety states related to their variable operation conditions are defined. For these systems the conditional and unconditional multi-state safety functions are determined. A semi-markov process for the considered systems operation modelling is applied. Further, the paper offers an approach to the solution of a practically important problem of linking the multi-state systems safety models and the systems operation processes models. Theoretical definitions and results are illustrated by the example of their application in the safety and risk evaluation of the Stena Baltica ferry operating at the Baltic Sea. The ferry transportation system has been considered in varying in time operation conditions. The system safety structure and its components safety functions were changing in variable operation conditions.
Źródło:: Journal of Polish Safety and Reliability Association; 2009, 2; 231--240
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 processes: application in system reliability and maintenance
Autorzy:: Grabski, F.
Powiązania:: https://bibliotekanauki.pl/articles/2069404.pdf
Data publikacji:: 2014
Wydawca:: Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:: reliability
maintenance
semi-Markov process
semi-Markov perturbed processes
Opis:: The author’s monograph “Semi-Markov Processes: Application in System Reliability and Maintenance” which will be published by Elsevier in 2014 is presented. The paper is composed of an introduction, the monograph contents, conclusions and the references the monograph contents is based on.
Źródło:: Journal of Polish Safety and Reliability Association; 2014, 5, 1; 57--62
2084-5316
Pojawia się w:: Journal of Polish Safety and Reliability Association
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

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

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Skocz do pozycji: 4.

Tytuł:: Attempts at calculating chosen contributors with regard to the Semi- Markov process and the Weibull function distribution
Autorzy:: Zajac, M.
Kierzkowski, A.
Powiązania:: https://bibliotekanauki.pl/articles/2069531.pdf
Data publikacji:: 2011
Wydawca:: Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:: Semi Markov process
exponential distribution
availability
transient probabilities
Opis:: The main aim of this article is the presentation of the way of making calculation with the application of the semi-Markov processes, with the continuous time t, where non-exponential distribution function is going to be applied. These type of calculations were published but the time there was approaching infinity. Engineering practice proves that the lack of solutions of this issue leads to obtainment of solutions that are encumbered with errors. This article is the first attempt of the error analysis.
Źródło:: Journal of Polish Safety and Reliability Association; 2011, 2, 1; 217--222
2084-5316
Pojawia się w:: Journal of Polish Safety and Reliability Association
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Preliminary statistical identification and prediction of the container gantry crane operation process
Autorzy:: Kołowrocki, K.
Soszyńska, J.
Powiązania:: https://bibliotekanauki.pl/articles/2069653.pdf
Data publikacji:: 2010
Wydawca:: Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:: semi-Markov process
system operation process
sojourn time
estimation
Opis:: In the paper a Semi-markov process is used to construct a general model of complex industrial systems’ operation processes. Main parameters of this model are defined and its main characteristics are determined as well. In particular case, for a gantry crane, the operation states are defined, the relationships between them are fixed and particular model of its operation process is constructed and finally its main characteristics are determined.
Źródło:: Journal of Polish Safety and Reliability Association; 2010, 1, 1; 173--180
2084-5316
Pojawia się w:: Journal of Polish Safety and Reliability Association
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Model-building adaptive critics for semi-Markov control
Autorzy:: Gosavi, A.
Murray, S.
Hu, J.
Ghosh, S.
Powiązania:: https://bibliotekanauki.pl/articles/91878.pdf
Data publikacji:: 2012
Wydawca:: Społeczna Akademia Nauk w Łodzi. Polskie Towarzystwo Sieci Neuronowych
Tematy:: adaptive critics
learning algorithm
semi-Markov process
decision process
Opis:: Adaptive (or actor) critics are a class of reinforcement learning algorithms. Generally, in adaptive critics, one starts with randomized policies and gradually updates the probability of selecting actions until a deterministic policy is obtained. Classically, these algorithms have been studied for Markov decision processes under model-free updates. Algorithms that build the model are often more stable and require less training in comparison to their model-free counterparts. We propose a new model-building adaptive critic, which builds the model during the learning, for a discounted-reward semi-Markov decision process under some assumptions on the structure of the process. We illustrate the use of our algorithm with numerical results on a system with 10 states and a real-world case-study from management science.
Źródło:: Journal of Artificial Intelligence and Soft Computing Research; 2012, 2, 1; 43-58
2083-2567
2449-6499
Pojawia się w:: Journal of Artificial Intelligence and Soft Computing Research
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Concept of semi-Markov process
Koncepcja procesu semi-Markowa
Autorzy:: Grabski, F.
Powiązania:: https://bibliotekanauki.pl/articles/221956.pdf
Data publikacji:: 2016
Wydawca:: Akademia Marynarki Wojennej. Wydział Dowodzenia i Operacji Morskich
Tematy:: semi-Markov process
probabilities matrix
proces semi-Markova
macierz prawdopodobieństw
Opis:: This paper provides the definitions and basic properties related to a discrete state space semi-Markov process. The semi-Markov process is constructed by the so called Markov renewal process that is a special case the two-dimensional Markov sequence. The Markov renewal process is defined by the transition probabilities matrix, called the renewal kernel and an initial distribution or by another characteristics which are equivalent to the renewal kernel. The counting process corresponding to the semi-Markov process allows to determine concept of the process regularity. In the paper are also shown the other methods of determining the semi-Markov process. The presented concepts are illustrated a simple example.
Artykuł przedstawia definicje i podstawowe cechy procesu semi-Markowa dyskretnego stanu przestrzeni. Proces semi-Markova jest zbudowany przez tzw. proces odnawiania Markova, który jest specjalnym przypadkiem dwuwymiarowego ciągu Markova. Proces odnawiania Markova jest zdefiniowany przez macierz prawdopodobieństw przejściowych, zwaną jądrem odnawiania, i początkowy rozkład lub przez inne charakterystyki, które są równe jądru odnawiania. Proces obliczeniowy odpowiadający procesowi semi-Markova pozwala na określenie koncepcji regularności procesu. W artykule przedstawiono również pozostałe metody określania procesu semi-Markova. Przedstawione koncepcje są zaprezentowane na prostym przykładzie.
Źródło:: Zeszyty Naukowe Akademii Marynarki Wojennej; 2016, R. 57 nr 3 (206), 3 (206); 25-36
0860-889X
Pojawia się w:: Zeszyty Naukowe Akademii Marynarki Wojennej
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Complex technical systems safety prediction
Autorzy:: Soszyńska-Budny, J.
Powiązania:: https://bibliotekanauki.pl/articles/2069501.pdf
Data publikacji:: 2014
Wydawca:: Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:: safety function
complex system
Semi-Markov process
system operation process
Opis:: There are presented general safety analytical models of complex multistate technical systems related to their operation processes. They are the integrated general models of complex technical systems, linking their multistate safety models and their operation processes models and considering variable at the different operation states safety structures and their components safety parameters. The conditional safety functions at the system particular operation states and independent of the system particular operation states the unconditional safety function and the risk function of the complex technical systems are defined. These joint models of the safety and the variable in time system operation processes are constructed for multistate series, parallel, “m out of n”, consecutive “m out of n: F”, series-parallel, parallel-series, series-“m out of k”, “mi out of li”-series, series-consecutive “m out of k: F” and consecutive “mi out of li: F”-series systems. The joint models are applied to determining safety characteristics of these systems related to their varying in time safety structures and their components safety characteristics. Under the assumption that the considered systems are exponential, the unconditional safety functions of these systems are determined. The proposed models and methods are applied to the safety analysis, evaluation and prediction of the one subsystem of the port grain transportation system related to varying in time their operation processes, structures and components safety parameters.
Źródło:: Journal of Polish Safety and Reliability Association; 2014, 5, 2; 127--142
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:: Monte Carlo approach to identification of maritime ferry operation process
Autorzy:: Otremba, Z.
Soszyńska, J.
Targowski, W.
Powiązania:: https://bibliotekanauki.pl/articles/2069652.pdf
Data publikacji:: 2010
Wydawca:: Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:: operation process
semi-Markov process
complex systems
Monte Carlo simulation
Opis:: The paper is concerned with the identification of operation processes of complex technical systems. The convenient tools suggested for analyzing these complex technical systems operation processes are semi-markov modeling and Monte Carlo simulation. The paper describes the proposed approach as well as the possibility of its practical application to identification of the operation process of a maritime ferry.
Źródło:: Journal of Polish Safety and Reliability Association; 2010, 1, 1; 187--192
2084-5316
Pojawia się w:: Journal of Polish Safety and Reliability Association
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: A general model of industrial systems operation processes related to their environment and infrastructure
Autorzy:: Kołowrocki, K.
Soszyńska, J.
Powiązania:: https://bibliotekanauki.pl/articles/2069711.pdf
Data publikacji:: 2008
Wydawca:: Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:: system operation process
semi-markov process
system in varying operation
Opis:: The operation process of the complex industrial system is considered and its operation states are introduced. The semi-markov process is used to construct a general probabilistic model of the considered complex industrial system operation process. To build this model the vector of probabilities of the system operation process initials operation states, the matrix of probabilities of the system operation process transitions between the operation states, the matrix of conditional distribution functions and the matrix of conditional density functions of the system operation process conditional sojourn times in the operation states are defined. To describe the system operation process conditional sojourn times in the particular operation states the uniform distribution, the triangle distribution, the double trapezium distribution, the exponential distribution, the Weibull distribution and the normal distribution are suggested. Under these all assumptions from the constructed general model the main characteristics of the system operation process are find. The mean values of the system operation process conditional sojourn times in particular operation states having these distributions are calculated. Moreover, the unconditional distribution functions of the system operation process unconditional sojourn times in the particular operation states, the mean values of the system operation process unconditional sojourn times in the particular operation states, the limit values of the transient probabilities of the system operation process at the particular operation states and the mean values of the system operation process total sojourn times in the particular operation states are determined.
Źródło:: Journal of Polish Safety and Reliability Association; 2008, 2; 223--226
2084-5316
Pojawia się w:: Journal of Polish Safety and Reliability Association
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: Systems reliability analysis in variable operation conditions
Autorzy:: Soszyńska, J.
Powiązania:: https://bibliotekanauki.pl/articles/2069605.pdf
Data publikacji:: 2007
Wydawca:: Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:: reliability function
semi-markov process
large multi state system
Opis:: The semi-markov model of the system operation process is proposed and its selected parameters are defined. There are found reliability and risk characteristics of the multi-state series- “m out of k ” system. Next, the joint model of the semi-markov system operation process and the considered multi-state system reliability and risk is constructed. The asymptotic approach to reliability and risk evaluation of this system in its operation process is proposed as well.
Źródło:: Journal of Polish Safety and Reliability Association; 2007, 2; 319--330
2084-5316
Pojawia się w:: Journal of Polish Safety and Reliability Association
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: Identification of complex technical systems operation processes (part 2)
Autorzy:: Soszyńska, J.
Kołowrocki, K.
Blokus-Roszkowska, A.
Guze, S.
Powiązania:: https://bibliotekanauki.pl/articles/2069634.pdf
Data publikacji:: 2010
Wydawca:: Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:: system operation
semi-markov process
statistical identification
transportation systems
Opis:: There is presented the contents of the training course addressed to industry. The curriculum of the course includes the methods, algorithms and procedures for identification of the unknown parameters of the operations processes of the complex technical systems and their application in practice. It is based on theoretical backgrounds concerned with the semi-markov modelling of the complex technical systems operations processes, the statistical methods of identification of the complex technical systems operation processes. The illustrations of the proposed methods and procedures practical application in port, shipyard and maritime transport sector are included.
Źródło:: Journal of Polish Safety and Reliability Association; 2010, 1, 2; 309--328
2084-5316
Pojawia się w:: Journal of Polish Safety and Reliability Association
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: Identification of complex technical systems operation processes
Autorzy:: Soszyńska, J.
Kołowrocki, K.
Blokus-Roszkowska, A.
Guze, S.
Powiązania:: https://bibliotekanauki.pl/articles/2069640.pdf
Data publikacji:: 2010
Wydawca:: Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:: system operation
semi-Markov process
statistical identification
transportation systems
Opis:: There is presented the contents of the training course addressed to industry. The curriculum of the course includes the methods, algorithms and procedures for identification of the unknown parameters of the operations processes of the complex technical systems and their application in practice. It is based on theoretical backgrounds concerned with the semi-markov modelling of the complex technical systems operations processes, the statistical methods of identification of the complex technical systems operation processes. The illustrations of the proposed methods and procedures practical application in port, shipyard and maritime transport sector are included.
Źródło:: Journal of Polish Safety and Reliability Association; 2010, 1, 2; 287--308
2084-5316
Pojawia się w:: Journal of Polish Safety and Reliability Association
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 14.

Tytuł:: Conception of valuation of combustion engine operation
Autorzy:: Girtler, J.
Powiązania:: https://bibliotekanauki.pl/articles/244104.pdf
Data publikacji:: 2008
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: heat
operation
energy
work
semi-Markov process
combustion engine
Opis:: The work provides a proposal of interpretation showing operation in terms of values being compared to a physical quantity with the unit of measure called joule-second, just like operations of Hamilton and Maupertius demonstrated in classical mechanics. Operation in this interpretation is also considered in quantum mechanics, referring to body electromagnetic radiation source of which operation is characterized by Planck constant. An original method of analysis and evaluation of machine operation is herein presented in the energetic aspect, as the result of applying the theory of semi-Markov processes. In order to give grounds for usability of such interpreted operation it has been employed the model describing changes in energy of combustion engines, in the form of state-discrete and time-continuous semi-Markov process. The process is thus a semi-Markov model of getting worse combustion engine operation run with the lapse of time and regaining the initial energetic state of the engine after its refurbishment. The limiting distribution of the process has been determined with probabilities of occurring the distinguished energetic states of mentioned engines. The paper shows that the proposed interpretation for the operation enables making a graph of operation, which demonstrates engine operation in the form of field. The attention is paid that the engine operation in the presented version has got the advantage that can be expressed as a quantity with the joule-second as a unit of measure and as a graph in the form of operation field. The coordinate system for presenting the operation as a field, proposed in this paper, refers to the known in thermodynamics possibility of expressing the energy conversion sorts like work and heat (according to the conception of Clapeyron and Belpaire) in the form of fields.
Źródło:: Journal of KONES; 2008, 15, 2; 89-96
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 15.

Tytuł:: The semi-Markov model of energy state changes of the main marine internal combustion engine and method for evaluating its operation during ship voyage
Autorzy:: Girtler, J.
Powiązania:: https://bibliotekanauki.pl/articles/260072.pdf
Data publikacji:: 2011
Wydawca:: Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:: operation
energy
semi-Markov process
piston internal combustion engine
Opis:: The article presents a method for evaluating the operation of internal combustion engines used as the main engines in the propulsion systems of sea-going ships in various operating conditions. This method enables calculating the engine operation value based on the theory of semi-Markov processes and mathematical statistics. What is noteworthy, the operation of the examined internal combustion engines is compared to a physical quantity which is expressed in the form of a number with the measure unit called joule-second. a model having the form of a semi-Markov process is proposed to describe the energy state changes taking place in the main engines during their operation. Also proposed is the use of the point and interval estimation at a given confidence level â for determining the value of the energy converted in the engine during its operation for the known and unknown standard energy deviation treated as the random variable. The semi-Markov model of changes of the energy converted in the engine during its operation is presented in a general form. The above model was used for determining the ship’s main engine operation, which is in the examined case a function of the energy converted in particular energy states, the expected value of the time of duration of these states and the probability of their existence. These probabilities compose the limiting distribution of the semi-Markov process, the values of which are the specified main engine energy states.
Źródło:: Polish Maritime Research; 2011, 4; 36-42
1233-2585
Pojawia się w:: Polish Maritime Research
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 16.

Tytuł:: Prediction of complex technical systems operation processes
Autorzy:: Soszyńska, J.
Kołowrocki, K.
Blokus-Roszkowska, A.
Guze, S.
Powiązania:: https://bibliotekanauki.pl/articles/2069638.pdf
Data publikacji:: 2010
Wydawca:: Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:: system operation
semi-Markov process
system operation prediction
transportation systems
Opis:: There is presented the contents of the training course addressed to industry. The curriculum of the course includes the methods, algorithms and procedures for prediction of the operation processes of the complex technical systems and their application in practice. It is based on the theoretical backgrounds concerned with the semi-markov modelling of the complex technical systems operation processes and on the methods of these processes prediction. The illustrations of the proposed methods and procedures practical application in port, shipyard and maritime transport sector and are included.
Źródło:: Journal of Polish Safety and Reliability Association; 2010, 1, 2; 497--510
2084-5316
Pojawia się w:: Journal of Polish Safety and Reliability Association
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 17.

Tytuł:: Application of the theory of semi-Markov processes to the development of a reliability model of an automotive vehicle
Zastosowanie teorii procesów semi-Markowa do opracowania modelu niezawodnościowego samochodu
Autorzy:: Girtler, J.
Ślęzak, M.
Powiązania:: https://bibliotekanauki.pl/articles/1364785.pdf
Data publikacji:: 2012
Wydawca:: Sieć Badawcza Łukasiewicz. Przemysłowy Instytut Motoryzacji
Tematy:: niezawodność
proces semimarkowski
samochód
automotive vehicle
reliability
semi-Markov process
Opis:: A possibility of applying the theory of semi-Markov (semimarkovian) processes to the description of the reliability of an automotive vehicle has been presented, with taking a passenger car as an example. In the car considered, such constructional systems (functional components) as engine with fuel, lube oil, and coolant feeding systems, clutch, gearbox, drive shaft, driving axle, steering and suspension system, braking system, electrical system, body with chassis, and measuring and monitoring equipment have been distinguished. A reliability model of the car has been developed in the form of a semi-Markov process, which is a single-state model. The set of reliability states has been built as consisting of one state of car serviceability and ten states of the functional components as specified above. A graph of changes in these states has been shown and an initial distribution and a functional matrix representing changes in the said reliability states of the car have been defined. Formulas have been derived that define the boundary distribution of the process of changes in the technical states of such a car. This distribution represents the probability of the car being serviceable and unserviceable due to a failure of any of the functional components mentioned above. The possibility of using statistics to estimate the probabilities of changes in the said car reliability states has been presented. A possibility of applying the theory of semi-Markov processes to the investigation of car reliability in the case of defining the instantaneous distribution of the process of changes in the car reliability states has also been mentioned.
W artykule przedstawiono możliwość zastosowania teorii procesów semi-Markowa (semimarkowskich) do opisu niezawodności samochodu, na przykładzie samochodu osobowego. W rozważaniach uwzględniony został samochód, w którym wyróżniono takie węzły konstrukcyjne (zespoły funkcjonalne) jak: silnik z układami zasilania czynnikami energetycznymi (paliwem, olejem smarowym i cieczą chłodzącą), sprzęgło, skrzynia biegów, wał napędowy, most napędowy, zespół kierowniczy z zawieszeniem, zespół hamulcowy, zespół urządzeń elektrycznych, nadwozie wraz z podwoziem i zespół urządzeń kontrolno-pomiarowych. Opracowano model niezawodnościowy samochodu w formie procesu semimarkowskiego, który jest modelem jedenastostanowym. Do zbioru stanów niezawodnościowych samochodu zakwalifikowano stan zdatności samochodu oraz dziesięć stanów niezdatności wymienionych zespołów funkcjonalnych. Przedstawiono graf zmian tych stanów oraz określono rozkład początkowy i macierz funkcyjną odwzorowującą zmiany wymienionych stanów niezawodnościowych samochodu. Wyprowadzone zostały wzory określające rozkład graniczny procesu zmian stanów technicznych takiego samochodu. Rozkład ten stanowią prawdopodobieństwa przebywania samochodu w stanie zdatności oraz w stanach niezdatności wskutek uszkodzenia dowolnego z wymienionych jego zespołów funkcjonalnych. Przedstawiono możliwość zastosowania statystyki do oszacowania prawdopodobieństw zmiany wspominanych stanów niezawodnościowych samochodu. Zasygnalizowano także możliwość zastosowania teorii procesów semimarkowskich do badań niezawodności samochodów w przypadku opracowania rozkładu chwilowego procesu zmian ich stanów niezawodnościowych.
Źródło:: Archiwum Motoryzacji; 2012, 2; 15-27
1234-754X
2084-476X
Pojawia się w:: Archiwum Motoryzacji
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 18.

Tytuł:: Reliability analysis of a system subjected to two-state operation process
Autorzy:: Kuligowska, E.
Powiązania:: https://bibliotekanauki.pl/articles/358995.pdf
Data publikacji:: 2013
Wydawca:: Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:: reliability analysis
simulation methods
operation states
semi-Markov process
modeling
Opis:: The paper presents analytical and Monte Carlo simulation methods applied to the reliability evaluation of a system operating at two different operation states. A semi-Markov process is applied to construct the system operation model and its main characteristics are determined. Analytical linking of this operation model with the system reliability model is proposed to get a general reliability model of the system operating at two varying operation conditions and to find its reliability characteristics. The application of Monte Carlo simulation based on this general model to the reliability evaluation of this system is proposed as well. The results obtained from those two considered methods are evaluated.
Źródło:: Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2013, 36 (108) z. 1; 100-104
1733-8670
2392-0378
Pojawia się w:: Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 19.

Tytuł:: Analysis of the process of operating an aircraft from aspect of flight safety and effectiveness
Autorzy:: Żurek, J.
Powiązania:: https://bibliotekanauki.pl/articles/245779.pdf
Data publikacji:: 2009
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: transport
air transport
durability
relibility
semi-Markov process
availability factor
Opis:: This paper presents the method of evaluation of a technical object as immersed in a logistic system with regard to its durability, the operational availability/readiness and the utilisation factor. These factors decide upon the object's effectiveness. For this evaluation probabilistic models from the theory of reliability and of the semi-Markov process were used. For the purpose of this paper as a technical object serves an aircraft. The process of operating an aircraft consists in using its resources to function accumulated during the process of its manufacture and resulting from a periodic regeneration of these resources in order to maintain its capability of being further operated. For the sake of better understanding our discussion we will refer to the sald 'flying craft' as an aircraft (including also other 'means of transport' into this notion). The paper in principle concerns on analysis of safe durability and aircraft availability/readiness analysis. The availability factor of an object in a logistic system expresses the prospective possibility of an effective action. The degree of utilisation of this „potential" for apassenger plane is represented by the occupancy factor. A product ctors of availability and occupancy can describe the overall effectiveness indicator, which characterises the availability and the market demand.
Źródło:: Journal of KONES; 2009, 16, 3; 527-536
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 20.

Tytuł:: Stochastic model of the load spectrum for main engines of sea-going ships
Autorzy:: Girtler, J.
Powiązania:: https://bibliotekanauki.pl/articles/243406.pdf
Data publikacji:: 2007
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: semi-Markov process
load
diesel engine
main engine
sea ship
Opis:: The paper presents possibility of applying the theory of semi-Markov processes for probabilistic description of load spectrum for diesel engines employed for ship propulsion, so for main engines. The considerations include output power characteristics for this kind of engines. The characteristics have enabled formulating a four-member set of states of the process of load on the engines. The theory of semi-Markov processes has been applied for describing the real process of loads on the mentioned engines. This theory has made possible building a model of the engine loads in form of a continuous-time semi-Markov process with a four-state set of values. Properties of a Darboux continuous function, which allow considering the engine loads as the discrete-states and continuous-time processes, have been used to build the model. In consequence a limiting distribution of the occurring process of successive states of engine loads could be determined. The distribution is the probabilities of staying a sea-going ship main engine in successive states of load. The distribution is characterized by the spectrum of loads on this kind of engines. The presented model can be developed by taking into account many states of the process of main engines loading as the need is to make such a probabilistic description of the process that provides possibility of rational control of the operating process.
Źródło:: Journal of KONES; 2007, 14, 3; 187-193
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 21.

Tytuł:: Application of theory of semi-Markov processes to determining distribution of probabilistic process of marine accidents resulting from collision of ships
Autorzy:: Girtler, J.
Powiązania:: https://bibliotekanauki.pl/articles/260618.pdf
Data publikacji:: 2014
Wydawca:: Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:: critical manoeuvre
port
probability
semi-Markov process
sea-going ship
Opis:: In this paper is presented possible application of the theory of semi-Markov processes to elaborating an eight-state model of the process of occurrence of serviceability state and unserviceability states of sea-going ships making critical manoeuvres during their entering and leaving the ports. In the analysis it was taken into account that sea-going ships are in service for a very long time t (t → ∞). The model was elaborated to determine the probability (P0) of correct execution of critical manoeuvres during ship’s entering and leaving the port as well as the probabilities Pj(j = 1, 2, 3, …, 7) of incorrect execution of critical manoeuvres by a ship, that leads to marine accidents. It was assumed that such accidents result from: ship’s grounding on port approaching fairway, collision with a ship on port approching fairway, collision with a pierhead during passing through port entrance, collision with a hydrotechnical structure during ship’s passing through port channels, collision with a port quay during coming alongside it and collision with a ship already moored to the quay. The probability (P0) was assumed a measure of safe execution of a critical manoeuvre. The probability characterizes possibility of avoiding any collision during ship’s entering and leaving the port. The probability Pa = 1 – P0 was assumed a measure of occurrence of a collsion and - consequently - marine accident. The probability Pa was interpreted as a sum of the probabilities Pj(j = 1, 2, 3, …, 7) of occurrence of all the selected events. In summing up the paper, attention was drawn to its merits which - in opinion of this author - are crucial for research on real process of accidents during entering the port and leaving it by sea-going ship in difficult navigation conditions.
Źródło:: Polish Maritime Research; 2014, 1; 9-13
1233-2585
Pojawia się w:: Polish Maritime Research
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 22.

Tytuł:: Non-renewal multistate system with Semi-Markov components
Autorzy:: Grabski, F.
Powiązania:: https://bibliotekanauki.pl/articles/2069483.pdf
Data publikacji:: 2014
Wydawca:: Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:: Semi-Markov process
multistate system
multistate reliability functions
binary representation
Opis:: The paper deals with non-renewal multistate monotone systems consisting of multistate components which are modeled by the semi-Markov processes. In the case of a non-renewal system the multistate reliability functions of the system components and the whole system are discussed. All presented concepts and models are illustrated by simple numerical examples.
Źródło:: Journal of Polish Safety and Reliability Association; 2014, 5, 1; 63--70
2084-5316
Pojawia się w:: Journal of Polish Safety and Reliability Association
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 23.

Tytuł:: Four-state stochastic model of changes in the reliability states of a motor vehicle
Model stochastyczny czterostanowy zmian stanów niezawodnościowych samochodu
Autorzy:: Girtler, J.
Ślęzak, M.
Powiązania:: https://bibliotekanauki.pl/articles/1366153.pdf
Data publikacji:: 2013
Wydawca:: Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:: niezawodność
proces semimarkowski
samochód
reliability
semi-Markov process
motor vehicle
Opis:: The properties of semi-Markov processes have been generally characterized and the applicability of the theory of such processes to the determining of the reliability of motor cars and other road vehicles has been explained. A formal description of the process of changes in the motor vehicle technical states considered as reliability states and a model of this process in the form of a one-dimensional stochastic process have been presented. The values of this process are the technical states of the motor vehicle in question that have significant practical importance. A four-state set of states interpreted as follows has been adopted: full (complete) serviceability, partial (incomplete) serviceability, task-limiting serviceability,and complete (total) unserviceability. Based on the initial distribution adopted and the functional matrix worked out, the boundary distribution of the process of changes in the technical (reliability) states of the motor vehicle has been defined. The probability of the vehicle being fully serviceable has been considered a measure of the vehicle reliability for a long period of vehicle operation. A possibility of defining the vehicle reliability in the form of a probability that a task would also be fulfilled by the vehicle being partially serviceable has also been indicated.
W artykule scharakteryzowano ogólnie własności procesów semimarkowskich i uzasadniono możliwości ich zastosowania do określenia niezawodności samochodów i innych pojazdów drogowych. Przedstawiono formalny opis procesu zmian stanów technicznych samochodów uznanych za stany niezawodnościowe oraz model tego procesu w postaci jednowymiarowego procesu stochastycznego. Wartościami tego procesu są występujące w czasie eksploatacji stany techniczne samochodów, mające istotne znaczenie praktyczne. Przyjęto czterostanowy zbiór stanów o następującej interpretacji: stan zdatności pełnej (całkowitej), stan zdatności częściowej (niepełnej, niecałkowitej), stan niepełnej zdatności zadaniowej i stan niezdatności pełnej (całkowitej). Na podstawie przyjętego rozkładu początkowego i opracowanej macierzy funkcyjnej został określony rozkład graniczny procesu zmian stanów technicznych (niezawodnościowych) samochodu. Prawdopodobieństwo istnienia stanu zdatności pełnej (całkowitej) samochodu zostało uznane za miarę jego niezawodności w długim okresie czasu eksploatacji. Wskazano też na możliwość określenia niezawodności samochodu w formie prawdopodobieństwa, w którym uwzględniony został przypadek wykonania zadania przez samochód także wtedy, gdy znajduje się on w stanie zdatności częściowej.
Źródło:: Eksploatacja i Niezawodność; 2013, 15, 2; 156-160
1507-2711
Pojawia się w:: Eksploatacja i Niezawodność
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 24.

Tytuł:: Analysis of the change of qualitative states of transportation system operation
Autorzy:: Muślewski, Ł
Knopik, L.
Woropay, M.
Powiązania:: https://bibliotekanauki.pl/articles/247633.pdf
Data publikacji:: 2014
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: transport
system operation quality
model
Markov chain
semi-Markov process
expected coast
Opis:: This paper deals with the problems connected with evaluation of a technical system and its being later used for decision making in order to provide complex technical systems with appropriate operation quality. The research object is a real municipal transportation system. The assessment quality of the systems operation is based on the changes of the systems features values. The features describe the operation of the systems operators, controlled technical objects and the environment influence. The assessment and the support the demand quality of the systems operation from the safety, efficiency, economic and reliability point of view is the basic factor of the executed exploitation process. The notion of a system operation quality has been defined, a scheme of an assessment model has been presented and a random process, providing the basis for evaluation of a technical system, has been developed. On the basis of carried out experimental tests there have been distinguished four states of a system operation quality reflecting intervals of values of grades that were characteristic for given time moments. A model of system operation qualitative state changes, based on Markov chain, has been considered in this paper. A system of equations has been determined for a distinguished Markov chain on the basis of which a mathematical model for assessment and control of selected types of transportation systems will be developed.
Źródło:: Journal of KONES; 2014, 21, 3; 251-257
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 25.

Tytuł:: Analysis of operation efficiency of selected transport systems
Autorzy:: Muślewski, Ł.
Lewalski, M.
Aleksandrowicz, P.
Landowski, B.
Powiązania:: https://bibliotekanauki.pl/articles/245072.pdf
Data publikacji:: 2016
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: transport system
efficiency
operation process
maintenance process
semi-Markov process
simulation tests
Opis:: This study deals with the problems connected with evaluation of technical systems efficiency of particular transport systems. The main goal of such a system operation is its effective functioning, through rational control of its particular activities and subsequent processes. A literature analysis of the definition of the efficiency term has been made. A real transport system has been accepted to be the research object. The system belongs to the group of sociotechnical systems in which evaluation of its operation efficiency depends on performance of operators, transport means and the impact of environmental factors. Criteria and methods of operation efficiency evaluation have been determined in this study as well as assessment indexes for transport systems. It has been shown that evaluation of a repair efficiency has a large influence on the efficiency of the whole system operation, especially the influence of secondary failure repairs, on the values of particular efficiency indexes. A semi-markov model of operation and maintenance of transport means used in the research object has been developed. This model provides the basis for evaluation of the influence of the processes involved in preparing transport means for service on the system operation efficiency. Moreover, the research also describes how to verify the developed model and present its simulation tests. The study is summarized with conclusions formulated based on the evaluation of the influence of the operation and maintenance processes on the investigated transport system operation efficiency.
Źródło:: Journal of KONES; 2016, 23, 3; 351-358
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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