Abstract
The operation safety of the railway rolling stock depends directly on the strength of the base part of the wheelset – its axle. Therefore, in recent years numerous studies of theoretical and experimental nature, both for means of rail transport, and for machines containing rail track equipment are carried out. This paper substantiates the main parameters of the fatigue test bench for axles for wheelsets of railway rolling stock. We performed an analysis of the load schema for bench tests, determined the dependence of the bench work force on the parameters of the wheelset axle. In addition, we substantiated the design and parameters of vibrator. For the research, we adopted the following criteria of rationality: work force, energy consumption and longitudinal dimension of the test bench. The design is considered the best, if these criteria acquire the smallest values. The results of the research indicate that the load scheme “cantilever beam” is rational for the fatigue bench tests of the axles for wheelsets of railway rolling stock. The best design of the vibrator have to provide the test bench work force by rotating the unbalanced mass around the stationary wheelset axle. The rational vibrator contains a sectoral eccentric mass rotating at an angular velocity of about 150 s-1. In this case, the eccentric mass value is about 80 kg, and its eccentricity is 135 mm.
Highlights
The widespread used was gained by railway transportation vehicles
The operational safety of a railway transportation vehicle is directly related to the strength of wheelset basic part, i.e. its axle
Due to high angular speeds of debalance rotation the magnitude of the test-bench operational force begins to be influenced by inaccuracies of fabrication and mounting of wheelset axle and vibrator elements
Summary
The widespread used was gained by railway transportation vehicles. They are used for transportation loads and people within the precincts of an enterprise, open-pit mine or in mines (intra-company industrial conveyance facilities) or ensure traffic between certain enterprises (external industrial conveyance facilities, including the railway transport). Each of railway transportation vehicles includes a bogie that contains, in particular, a wheelset (WS). This component part containing an axle as a basic part, running wheels (or a single wheel for semi-axles) and a gear wheel (for driving axles). The operational safety of a railway transportation vehicle is directly related to the strength of wheelset basic part, i.e. its axle. Latterly numerical studies of theoretic and experimental nature are conducted, both for railway transport vehicles [1, 2, 3], and for motor vehicles that contain railway running equipment [4, 5, 6]
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