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A CONCEPT OF DETERMINING THE RELATION BETWEEN LOAD AND WEAR OF TRIBOLOGICAL SYSTEMS OF SHIP MAIN SELFIGNITION ENGINES BY USING PROBABILISTIC APPROACH

Abstract

This paper presents a proposal of simultaneous consideration of load and wear associated with it, of tribological systems of ship main engines (intended for ship propulsion) . Based on results of investigations it was assumed that both the load Q (i.e. a cause of wear ) and the wear Z (i.e. an effect of load occurrence) considered in a given time t (0 ≤ t ≤ tn) are random variables Qt and Zt, respectively. There was characterized operational principle of ship main engines in definite external conditions (WZ) as well as consequences of excessive load of engines. Three hypotheses highlighting relations existing between load and wear of the above mentioned systems, have been proposed. The first of them deals with explanation of stochastic relation between load and wear, the second highlights why it is possible to assume that the load Qt and the wear Zt are positively correlated , and the third – why it is possible to assume that coefficient of correlation between Qt and Zt may be taken close to one.

Keywords:

combustion engine load, probability, stochastic process, self-ignition engine, random variable, statistical relation, stochastic relation

Details

Issue
Vol. 25 No. 4(100) (2018)
Section
Latest Articles
Published
18-01-2019
DOI:
https://doi.org/10.2478/pomr-2018-0139
Licencja:
Creative Commons License

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Open Access License

This journal provides immediate open access to its content under the Creative Commons BY 4.0 license. Authors who publish with this journal retain all copyrights and agree to the terms of the CC BY 4.0 license.

 

Authors

Jerzy Girtler

Gdansk University of Technology, Faculty of Ocean Engineering and Ship Technology, Department of Land and Marine Power Plants

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