Stochastic Model Of The Process Of Starting Combustion Engines And Practical Application Of The Process

• Autorzy: Girtler J.
• Języki publikacji: EN

Abstrakty

EN

The paper presents a proposal of a model of diesel engine (or gas turbine engine) starting process as semi- Markov process which is discreet in states and continuous during operation. States of the process are the following: cold engine state (s1), warm engine state (s2) and hot engine state (s3). Idea of using the model for determining a quantity of harmful substances emitted in exhaust gases during starting of engine, has also been proposed herein. Moreover, the paper provides a possibility of considering in researches on the quantity of harmful substances contained in exhaust gases, a mass of harmful substances as a random variable. For the considerations it has been accepted that statistics of the random variable has got asymptotically normal distribution. The presented stochastic model of self-ignition engines starting process enables deriving the limiting distribution of the process, being the probabilities of occurring the mentioned states (s1), (s2) and (s3) one by one. The distribution is indispensable to determine the expected value of the mass of harmful substances emitted in time of successive re-starts of engine performed during long operation. The second approach to estimation of the mentioned mass considered as a random variable enables estimating its expected value in time of long-term work of engines till the first failure or in the period between two successive preventive maintenances. Estimation of the expected value of the masses of harmful substances emitted during long operation of engine, can be made by applying point or interval estimation. The paper proposes the interval estimation because it makes possible to assess accuracy of the estimation. In this case the mentioned value is determined in the form of interval with random edges (limits), which comprises unknown value of the mass of harmful substances emitted by engine, at the probability called confidence level.

Słowa kluczowe

EN

diesel engine; semi-Markov process; toxic substance

• Wydawca: Faculty of Ocean Engineering and Ship Technology, Gdańsk University of Technology
• Czasopismo: Journal of Polish CIMAC
• Rocznik: 2008
• Tom: Vol. 3, no 2
• Strony: 9--13
• Opis fizyczny: Bibliogr. 19 poz., rys.

Twórcy

autor

Girtler J.

• Gdansk University of Technology Faculty of Ocean Engineering & Ship Technology Department of Ship Power Plants tel. [phone]; fax [phone],

Bibliografia

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