The useful life of a railcar axle bearing is strongly influenced by the dynamic load environment to which it is subjected. Impact loads from wheel tread profile (runout) errors ('wheel flats') can have a significant effect on this useful life. Wheel flats have traditionally been considered to be short wavelength (1 to 3-inch, 2.5 to 7.6 cm) effects. However, recent studies have shown the existence of longer-wavelength profile errors (10 to 16 inches, 25 to 76 cm, in length) capable of peak wheel/rail forces over 100.000 lb /445 kN). The lower frequency content of wheel/rail loads induced by these 'thumber' wheel profiles are less attenuated by the wheelset mass. This consequently results in significant dynamic loading between the side frame and wheelset masses, through the axle bearing. In this paper, the effects of this wheel-produced impact load environment on axle bearing life is explored.
Railroad bearing performance under the wheel impact load environment
Eisenbahnradlagerleistung unter Stossbelastung des Rades
ASME-Papers ; Dec ; 1-7
1987
7 Seiten, 8 Bilder, 2 Tabellen, 10 Quellen
Conference paper
English
RAILROAD VEHICLE TRUCK, WHEEL LOAD ADJUSTMENT METHOD AND WHEEL LOAD ADJUSTMENT SYSTEM
European Patent Office | 2017
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