engleski

Analysis of the Reliability of the "Alternator - Alternator Belt" System

Before starting and also during the exploitation of various systems, it is very important to know how the system and its parts will behave during operation regarding breakdowns, i.e. failures. It is possible to predict the service behaviour of a system by determining the functions of reliability, as well as frequency and intensity of failures. The paper considers the theoretical basics of the functions of reliability, frequency and intensity of failures for the two main approaches. One includes 6 equal intervals and the other 13 unequal intervals for the concrete case taken from practice. The reliability of the "alternator - alternator belt" system installed in the buses, has been analysed, according to the empirical data on failures. The empirical data on failures provide empirical functions of reliability and frequency and intensity of failures, that are presented in tables and graphically. The first analysis performed by dividing the mean time between failures into 6 equal time intervals has given the forms of empirical functions of failure frequency and intensity that approximately correspond to typical functions. By dividing the failure phase into 13 unequal intervals with two failures in each interval, these functions indicate explicit transitions from early failure interval into the random failure interval, i.e. into the ageing interval. Functions thus obtained are more accurate and represent a better solution for the given case. In order to estimate reliability of these systems with greater accuracy, a greater number of failures needs to be analysed.

reliability; failures; frequency of failures; intensity of failures

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