A Concept of Determining the Relation between Load and Wear of Tribological Systems of Ship Main Selfignition Engines by Using Probabilistic Approach

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 ≤ t_n) are random variables Q_t and Z_t ,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 Q_t and the wear Z_t are positively correlated , and the third - why it is possible to assume that coefficient of correlation between Q_t and Z_t may be taken close to one.