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Wyświetlanie 1-10 z 42
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
Artykuł
Tytuł:
Energetyczny aspekt diagnostyki maszyn
Energy-based aspect of machine diagnostics
Autorzy:
Girtler, J.
Powiązania:
https://bibliotekanauki.pl/articles/327526.pdf
Data publikacji:
2008
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
diagnostyka
działanie
maszyna
energia
stan techniczny
diagnostics
operation
machine
energy
technical state
Opis:
W artykule zaproponowano interpretację wartościującą działania, które (podobnie jak przedstawione mechanice klasycznej działania Hamiltona i Maupertiusa oraz działanie wynikające ze zmiany pędu ciała) jest rozpatrywane jako wielkość fizyczna o jednostce miary zwanej dżulosekundą [dżulxsekunda]. Przedstawiono oryginalną metodę analizy i oceny działania maszyn w ujęciu energetycznym dla potrzeb diagnostycznych. Do uzasadnienia przydatności tak interpretowanego działania zastosowano jednorodny proces Poissona i proces semi-Markowa. Procesy te umożliwiły skonstruowanie modelu przebiegu pogarszania się działania maszyny z upływem czasu jej funkcjonowania. Modelem tym jest więc proces losowy Poissona lub semi-Markova. Rozważania dotyczące energetycznego aspektu diagnostyki maszyn przedstawiono na przykładzie silników spalinowych, w szczególności silników o zapłonie samoczynnym.
The paper presents a proposal of quantitative interpretation of operation which (just like in physics: the operations of Hamilton and Maupertius and the operation issuing from the changes of body momentum) is considered as a physical quantity with the unit of measure: a joule-second [joule´second]. The original method for analysis and estimation of machine operation has been showed in energy-based terms for the needs of diagnostics. In order to give the grounds for usability of such interpreted operation the homogeneous process of Poisson and process of semi-Markov have been herein applied. The two processes have enabled building a model of run of getting-worse (decreasing) operation of a machine at the lapse of its operation time. Thus, the model is a random process of Poisson or semi-Markov. The considerations concerning energy-based aspect of machine diagnostics have been provided on the example of combustion engines, mainly diesel engines.
Źródło:
Diagnostyka; 2008, 1(45); 149-156
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
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:
Concept for interpretation and assessment of slide bearings operation in diesel engines in probabilistic approach
Autorzy:
Girtler, J.
Powiązania:
https://bibliotekanauki.pl/articles/244383.pdf
Data publikacji:
2007
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
friction heat
operation
friction energy
slide bearing
friction work
Opis:
The paper provides a proposal of interpretation that valuates operations, which (just like operation of Hamilton and Maupertius shown in the classical mechanics and operation resulting from changes of body momentum) is considered as a physical quantity with: joule-second [joule x second] as a unit of measure. It presents suggestion of a quantitative interpretation of operation of a slide journal bearing, in which energetic interactions proceed at determined time. It has been here motivated that when the suggested interpretation for slide bearing operation in which energy conversions proceed, is accepted the operation can be a carrier of information about states of the systems so, it can become a diagnostic signal. Moreover, an original method of operation analysis and assessment for a slide journal bearing has been herein presented with regards to its reliability and safety. Possibilities of applying this method for the process of taking the rational operating decisions have been shown, too. The homogeneous process of Poison has been applied in order to prove usability of operation in such interpretation. This process has enabled construction of a model of the course of getting-worse operation for a bearing while the operation time goes by. Therefore, the model is a random process of homogenous and independent gains in energy lost due to friction and slide bearing wear.
Źródło:
Journal of KONES; 2007, 14, 4; 83-89
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
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:
Probabilistic concept of defining the situations possible to occur during operation of floating docks
Autorzy:
Girtler, J.
Powiązania:
https://bibliotekanauki.pl/articles/260295.pdf
Data publikacji:
2005
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
floating dock
safety
model
reliability
technical object
semi-Markov process
technical state
Opis:
In this paper possibility to assess safety of floating docks as a result of application of the theory of semi-Markov processes both in the phase of their designing and operating, is outlined. Formal description of the situations which may occur during service of floating docks both those intended for building and repairing the ships, was presented. The following situations were distinguished : normal, complicated, hazardous, emergency and disastrous. A model of changing the distinguished situations was proposed in the form of a semi - Markov process with discrete set of states, and continuous with time. The mentioned situations are values of the process. An operational safety measure for dock was formulated in the form of the probability of the event consisting in occurrence of normal or complicated situation. It was proved that assessment of probability of occurrence of particular situations is possible.
Źródło:
Polish Maritime Research; 2005, S 1; 34-38
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A probabilistic concept of assessment of amount of noxious substances contained in exhaust gas emitted from self-ignition engines
Autorzy:
Girtler, J.
Powiązania:
https://bibliotekanauki.pl/articles/260405.pdf
Data publikacji:
2006
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
engine start-up
self-ignition engine
noxious substance
Opis:
A probabilistic concept of toxicity assessment of exhaust gas emitted from self-ignition engines was presented. Without such assessment it is not possible to determine pro-ecological merits of various transport means driven by self-ignition engines, including inland waterways passenger ships. In the concept a model of starting-up process of self-ignition engines was taken into consideration. The model was presented in the form of a semi-Markovian process, discrete in states and continuous during service. The states of the process are : the cold engine state (s1 ), warm engine state (s2) and hot engine state (s3 ). It made it possible to determine probabilities of the starting-up of engines from its particular states. For determination of mass of noxious substances contained in exhaust gas it is necessary to know the probabilities. Usefulness of the model in assessing amount of the noxious substances results from that during the starting-up of such engines many noxious substances are produced.
Źródło:
Polish Maritime Research; 2006, S 2; 33-37
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A model of occurrence of the situations endangering inland waterways passenger ships and the environment
Autorzy:
Girtler, J.
Powiązania:
https://bibliotekanauki.pl/articles/260408.pdf
Data publikacji:
2006
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
inland waterways ship
prediction of failure probability
availability indices of ship devices
Opis:
In this paper a four-state semi-Markov model of occurrence of the situations endangering inland waterways passenger ships, is presented. The model was elaborated in the form of the semi - Markov process, values of which are kinds of the states interpreted as the following situations : normal, complicated, hazardous and emergency. An example of realization of the process of changing the situations possible to occur during trips of inland waterways passenger ships, is presented. Also, formulae are attached, which make it possible to determine probabilities of occurrence of the mentioned situations during ship trips. The formulae were interpreted as safety measures of operation of inland waterways ship. Possibility of performing statistical investigations which could provide data for determining the mentioned probabilities was also stated.
Źródło:
Polish Maritime Research; 2006, S 2; 38-42
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Physical aspects of application and usefulness of semi-Markovian processes for modelling the processes occurring in operational phase of technical objects
Autorzy:
Girtler, J.
Powiązania:
https://bibliotekanauki.pl/articles/259227.pdf
Data publikacji:
2004
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
technical object
semi-Marcovian process
tribological unit
wear
Opis:
In the paper usefulness of semi-Markovian processes for modelling real processes which occur in the operational phase of various technical objects, is considered. The usefulness of this theory was proved by presenting specific features of the semi-Markovian processes and physical aspects of their use as models of the processes occurring in the operational phase of the objects in question. The specific features were described with taking into account the process of changing the technical states of such objects. The physical aspects of models in the form of semi-Markovian processes were justified by postulating a hypoŹthesis by which wear process of tribological units of crucial sub-assemblies of machines, can be explained. Also, the consequences logically resulting from the hypothesis and necessary to its verification, are discusŹsed. A method for its verification is also attached. It was proved possible to model the real processes in question by means of the continuous semi-Markovian processes of finite set of states.
Źródło:
Polish Maritime Research; 2004, 3; 25-30
1233-2585
Pojawia się w:
Polish Maritime Research
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
Wyświetlanie 1-10 z 42

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