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    Wyświetlanie 1-9 z 9
    Tytuł:
    Probabilistyczna metoda określenia masy substancji szkodliwych emitowanych przez silnik o zapłonie samoczynnym podczas jego rozruchu
    Probabilistic Method of the Determination of Harmfu Substance Mass Emitted by a Diesel Engine During Its Starting
    Autorzy:
    Girtler, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/359487.pdf
    Data publikacji:
    2006
    Wydawca:
    Akademia Morska w Szczecinie. Wydawnictwo AMSz
    Tematy:
    model
    EXPLO-SHIP 2006
    rozruch silnika
    silnik o zapłonie samoczynnym
    substancja szkodliwa
    start up of an engine
    diesel engine
    harmful substance
    Opis:
    Zaproponowano model procesu rozruchu silników o zapłonie samoczynnym, w formie procesu semimarkowskiego, dyskretnego w stanach i ciągłego w czasie eksploatacji. Stanami tego procesu są: stan zimny silnika (s1), stan ciepły silnika (s2) i stan gorący silnika (s3). Przedstawiono koncepcję zastosowania opracowanego modelu do określenia ilości substancji szkodliwych, jakie emitowane są w spalinach podczas rozruchu silnika.
    The paper proposes a model of diesel engine starting process as a semi-Markov process which is discrete in states and continuous during operation. The states of this process are: cold state of the engine (s1), warm state (s2) and hot state of the engine (s3). The concept of using such a model for the determination of the quantity of harmful substances emitted in exhaust gases during the start up of the engine has been presented.
    Źródło:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2006, 10 (82); 193-204
    1733-8670
    2392-0378
    Pojawia się w:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Issue of changes in technical states of a Diesel engiene as the result of wear of its tribological systems
    Autorzy:
    Girtler, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/359783.pdf
    Data publikacji:
    2012
    Wydawca:
    Akademia Morska w Szczecinie. Wydawnictwo AMSz
    Tematy:
    load
    technical state
    diesel engine
    wear
    Opis:
    The paper shows a necessity to consider the processes of load on and wear of tribological systems in Diesel engines (and therefore the changes in their states) in real conditions as random processes. This means that mathematical models for these processes can be random functions with an argument which is time (t) and with values which are random variables such as loads and wear of particular tribological systems. The load properties for the tribological systems have been presented as the main causes of their failures. It has been signaled that a stochastic dependence should be expected between mechanical load and thermal load, whose the intensity (force) can be defined by Czuprow’s convergence coefficient. A proposal has been submitted to accept that the tribological system load in Diesel engines is a stationary process with asymptotically independent increments. The reasons for this proposal have been presented in the form of relevant hypotheses and an exemplary graph of changes in pressure and temperature in an engine cylinder under operation. Also it has been signaled that the models of wear processes in tribological systems may be stochastic processes with special properties called semi-Markov processes. The wear properties for these systems have been explained in the form of relevant hypotheses.
    Źródło:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2012, 31 (103); 77-82
    1733-8670
    2392-0378
    Pojawia się w:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    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
    Artykuł
    Tytuł:
    A method for evaluating theoretical and real operation of diesel engines in energy conversion formulation taking into account their operating indices
    Autorzy:
    Girtler, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/260600.pdf
    Data publikacji:
    2011
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    operation
    energy
    diesel engine
    ship’s main engine
    Opis:
    The article proposes valuating the operation of an arbitrary diesel engine, based on the sample case of a ship’s main engine in which energy conversion processes take place in a given time. The above operation is understood as the energy transfer to the screw propeller in the given time in which the energy conversion into work and/or heat and its further transmission take place. The here proposed method for evaluating the operation of the main engines installed in marine power plants consists in comparing the operation of these engines to a physical quantity the measuring unit of which is the joule-second (joule×second). A new term is introduced which bears the name of the theoretical engine operation and is the standard (ideal) operation which can be compared to the operation of real engines revealing different levels of wear. It was shown that the calculations of the theoretical operation defined in the above way cannot make direct use of commonly known theoretical Diesel and Sabathe cycles. Instead they should use the cycles modified by heat abstraction taking place in accordance with the isobaric, or isothermal process. Other new terms introduced in the article are: the degree of excellence of energy conversion to work, considered as the measure of excellence of engine operation, and the degree of engine operation dissipation, being the measure of its real operation. It is shown that if in time t of engine operation the case takes place that: Li = idem and Le = idem, then the engine operation dissipation is equal to its mechanical efficiency.
    Źródło:
    Polish Maritime Research; 2011, 3; 31-36
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination of probabilities defining safety of a sea-going ship during performance of a transportation task in stormy weather conditions
    Autorzy:
    Girtler, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2073602.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    reliability
    semi-Markov process
    diesel engine
    propeller
    sea-going ship
    steering gear
    niezawodność
    silnik wysokoprężny
    śmigło
    statek morski
    proces semi-Markowa
    Opis:
    The paper presents the possibility of applying the theory of semi-Markov processes to determine the limiting distribution for the process of changes of technical states being reliability states of the systems of sea-going ships significantly affecting safety of such ships, which include main engine, propeller and steering gear. The distribution concerns the probabilities of occurrence of the said states defined for a long time of ship operation (t → ∞). The considered states are as follows: s0 – full ability state of the systems, i.e.: main engine, propeller and steering gear, s1 – inability state of the main engine, s2 – inability state of the propeller, s3 – inability state of the steering gear. Significance of the systems for safety of the ships at sea was demonstrated herein. General conditions for performing transportation tasks by the ships, with particular regard to stormy conditions, were also here described.
    Źródło:
    Journal of Polish CIMEEAC; 2017, 12, 1; 21--30
    1231-3998
    Pojawia się w:
    Journal of Polish CIMEEAC
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of semi-Markov processes for evaluation of diesel engines reliability with regards to diagnostics
    Autorzy:
    Girtler, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2073613.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    diagnostics
    reliability
    semi-Markov process
    diesel engine
    diagnostic system
    diagnostyka
    niezawodność
    proces semi-Markova
    silnik Diesla
    system diagnostyczny
    Opis:
    The paper presents semi-Markov models of technical state transitions for diesel engines, useful for determination of their reliability, as a result of the conducted statistical empirical studies. Interpretation of technical states provided for this sort of engines refers to ship main engines, i.e. engines employed in propulsion systems of sea-going ships. The considerations recognize diesel engine as a diagnosed system (SDN), of which state can be identified by a diagnosing system (SDG). Both of the systems: SDN and SDG compose a diagnostic system (SD). Examples of three-state semi-Markov models were applied to demonstrate that in case of use of proper diagnosing systems (SDG) for identification of technical states of such engines as SDN, by classification of the states to the relevant class of the reference states, it is possible to make use of a Markov model to determine reliability of the engines. For developing a Markov model of state transitions for the engines, there were applied functions of the risk of damage: λ12 that causes transition from state s1 to state s2, and λ13 that causes transition from state s1 to state s3, as well as intensity functions of recovery (restitution): λ21 that causes transition from state s2 to state s1, and λ31 that causes transition from state s3 to state s1.
    Źródło:
    Journal of Polish CIMEEAC; 2016, 11, 1; 47--53
    1231-3998
    Pojawia się w:
    Journal of Polish CIMEEAC
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Reliability and types of diagnosis in the process of diesel engine operation
    Autorzy:
    Girtler, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2073667.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    diagnosis
    marine engine
    diesel engine
    diagnosing system
    diagnosed system
    diagnosis reliability
    Opis:
    The article presents complexity of the problem concerning development of diagnosis with defined reliability by a diagnosing system (SDG) on technical condition of marine combustion engines, especially main engines. It was shown that development of the final diagnosis, the so-called initial operation diagnosis, on the operational usability (fDG on PEx) of a main engine in particular, is not possible without prior development of reliable diagnoses such as: diagnosis on correctness of diagnostic signals, diagnosis on correctness of values of the measured diagnostic parameters of an engine (DG on pWM), diagnosis on technical condition of an engine (DG on ST) and initial diagnosis on operational usability of an engine (wDG on PEx), the so-called initial operation diagnosis. Difficulties in development of the diagnoses were emphasized herein due to the fact that the process of acquisition of information needed to develop diagnoses with certain reliability or accuracy is a two-dimensional stochastic process with components: B(t) – being considered during operation (use) of SDG (at so-called long time - quasistatic) and C(ʋ) – being considered while measuring diagnostic parameters and diagnostic inference (at so-called short time - dynamic). The need to determine reliability or accuracy rate of each diagnosis in the form of conditional probability P(S/K) was also indicated, where S – technical state of the engine and K – vector of values of diagnostic parameters reflecting state S. Diagnostic status of marine engine as a diagnosed system (SDN) was characterized in general, on the example of an engine operation process with regards to input (X), output (Y), constant (C) and interference (Z) values. Also there was explained how to understand the terms: diagnostic test, signal inference, measurement inference, structure inference and operation inference, and how inductive inference can be used to verify, for example, the hypothesis H on engine state S when vector K of values of engine diagnostic parameters is observed.
    Źródło:
    Journal of Polish CIMEEAC; 2018, 13, 1; 20--29
    1231-3998
    Pojawia się w:
    Journal of Polish CIMEEAC
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Possibility of estimating the reliability of diesel engines by applying the theory of semi-Markov processes and making operational decisions by considering reliability of diagnosis on technical state of this sort of combustion engines
    Możliwość oszacowania niezawodności silników o zapłonie samoczynnym z zastosowaniem teorii procesów semi-Markowa oraz podejmowania decyzji eksploatacyjnych z uwzględnieniem wiarygodności diagnozy o stanie technicznym tego rodzaju silników spalinowych
    Autorzy:
    Girtler, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/134152.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Naukowe Silników Spalinowych
    Tematy:
    diagnostics
    reliability
    semi-Markov process
    diesel engine
    statistics
    diagnosed system
    diagnosing system
    diagnostic system
    osady wewnętrzne we wtryskiwaczach paliwa
    silniki z zapłonem samoczynnym
    układ wtrysku paliwa
    Opis:
    The paper presents semi-Markov models of technical state transitions for diesel engines, useful for determining the reliability of engines. A possibility of application of a three-state model with a simplified matrix function, or even a two-state model, to determine reliability of the engines, has been described herein on examples of known from literature semi-Markov models, for the case when appropriate diagnosing systems (SDG) are used to identify the technical condition of the engines considered as diagnosed systems (SDN). A risk function and a renewal (restitution) function have been proposed for developing a two-state model of engine state transitions. An opportunity for considering the reliability of diagnosis for making operational decisions by applying the statistical decision theory, has also been presented. Conditional probability P(si/Ki) is recognized as a measure of reliability of diagnosis.
    W artykule przestawiono semimarkowskie modele zmian stanów technicznych silników o zapłonie samoczynnym, przydatne do określenia niezawodności tych silników. Wykazano, na przykładzie znanych z literatury modeli semimarkowskich, że do określenia niezawodności tych silników możliwe jest zastosowanie modelu trójstanowego o uproszczonej macierzy funkcyjnej, a nawet modelu dwustanowego, przy zastosowaniu odpowiednich systemów diagnozujących (SDG) do identyfikacji stanu technicznego wspomnianych silników jako systemów diagnozowanych (SDN). Do opracowania dwustanowego modelu zmian stanów silników zaproponowano wykorzystanie funkcji ryzyka i funkcji intensywności odnowy (restytucji). Przedstawiono także możliwość uwzględnienia wiarygodności diagnozy przy podejmowaniu decyzji eksploatacyjnych w sytuacji zastosowania statystycznej teorii decyzji. Za miarę wiarygodności diagnozy przyjęto prawdopodobieństwo warunkowe P(si/Ki).
    Źródło:
    Combustion Engines; 2015, 54, 4; 57-66
    2300-9896
    2658-1442
    Pojawia się w:
    Combustion Engines
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On the possible increasing of efficiency of ship power plant with the system combined of marine Diesel engine, gas turbine and steam turbine in case of main engine cooperation with the gas turbine fed in series and the steam turbine
    Autorzy:
    Dzida, M.
    Girtler, J.
    Dzida, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/258820.pdf
    Data publikacji:
    2009
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    ship power plants
    combined systems
    diesel engine
    gas turbine
    steam turbine
    Opis:
    The article presents a concept of a combined large power ship propulsion system consisting of the leading Diesel main engine, associated with a power gas turbine and the steam turbine system which utilise the energy contained in the exhaust gas leaving the Diesel engine. In the examined variant of the combined system the power turbine is fed in series with the exhaust gas. A calculation algorithm is given along with the results of calculations of particular subsystems of: the turbocharging system, the power gas turbine, and the steam turbine cycle. Assumptions and limits adopted in the calculations are presented. Selected system parameters were confronted with the results of experimental investigations available in the literature. The power optimisation of the entire combined ship power plant was only performed taking into account the thermodynamic point of view, leaving aside technical and economic aspects. Numerical calculations were performed for the 52 MW low-speed Diesel engine produced by Wärtsilä.
    Źródło:
    Polish Maritime Research; 2009, 3; 26-31
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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