Evaluation of the effects of geometrical deviations on the fatigue life and vibrations of cylindrical roller bearings

Titelangaben

Dahiwal, Rahul ; Aschenbrenner, Alexander ; Schleich, Benjamin ; Wiesker, S. ; Kiekbusch, T. ; Tremmel, Stephan ; Wartzack, Sandro ; Sauer, Bernd:
Evaluation of the effects of geometrical deviations on the fatigue life and vibrations of cylindrical roller bearings.
In: Bearing World Journal. Bd. 3 (2018) . - S. 7-21.
ISSN 2513-1753

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Abstract

Due to uncertainties in manufacturing processes all components suffer from geometric deviations and imperfections, even high-precision components like roller bearings. In general, tolerances define the allowable deviations of components and ensure their manufacturability, mountability and operational behavior. Nevertheless, geometric deviations can still unpredictably influence the operational behavior of components. Indeed, studies have shown that deviations together with the operating clearance can significantly affect the dynamic behavior and thus the fatigue life of roller bearings. In this contribution, two simulation methods are employed in order to consider and study the effect of geometric deviations like roundness or dimensional deviations of bearings and their adjacent components (shaft and housing) on a cylindrical roller bearing’s vibrational behavior and fatigue life. First, a statistical simulation model is introduced allowing an easy way to screen the operational clearance and fatigue life of a large number of cylindrical roller bearings. Afterward, a multibody dynamic model is used to gather detailed information about the load distribution on each rolling element and the inner ring displacement during operation. These methods allow a user of roller bearings a better understanding of the correlation between geometric deviations and a roller bearing’s vibrational behavior as well as fatigue life. The methods should also aid a user to optimize the geometric definition and tolerancing of their components. After a detailed description of the methods, their application is demonstrated for a use case.