Abstract
It is possible to determine a service life of an electric-multiple unit and its assemblies by actual time of proper operation or theoretically according to results of comprehensive test of components and parts. According to standards of car calculation on strength, for parts that work in conditions of long and intense influence of dynamic loads it is necessary to determine fatigue strength at multi-cycle loading. Calculation is carried out with the consideration for probabilistic dispersion of fatigue strength characteristics and stochasticity of dynamic loading of a part, on the basis of which a life cycle is determined. Oscillograms of dynamic processes gained at tests on the line in theoretical calculations are substituted by a number of simple cycles. Study results presented in the paper allow determining static and dynamic parameters of springs of the primary spring suspension for electric-multiple unit bogie and a type of a simple cycle and its parameters.
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