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Dynamic Analysis Model of Spherical Roller Bearings with Defects

Ghalamchi, Behnam (2014-11-14)

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Behnam_dissertation A4 4 11 .pdf (5.089Mb)
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Väitöskirja

Ghalamchi, Behnam
14.11.2014
Lappeenranta University of Technology

Acta Universitatis Lappeenrantaensis

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Julkaisun pysyvä osoite on
https://urn.fi/URN:ISBN:978-952-265-670-4

Tiivistelmä

Rolling element bearings are essential components of rotating machinery. The spherical
roller bearing (SRB) is one variant seeing increasing use, because it is self-aligning and
can support high loads. It is becoming increasingly important to understand how the SRB
responds dynamically under a variety of conditions. This doctoral dissertation introduces
a computationally efficient, three-degree-of-freedom, SRB model that was developed to
predict the transient dynamic behaviors of a rotor-SRB system. In the model, bearing
forces and deflections were calculated as a function of contact deformation and bearing
geometry parameters according to nonlinear Hertzian contact theory. The results reveal
how some of the more important parameters; such as diametral clearance, the number
of rollers, and osculation number; influence ultimate bearing performance. Distributed
defects, such as the waviness of the inner and outer ring, and localized defects, such
as inner and outer ring defects, are taken into consideration in the proposed model.
Simulation results were verified with results obtained by applying the formula for the
spherical roller bearing radial deflection and the commercial bearing analysis software.
Following model verification, a numerical simulation was carried out successfully for a
full rotor-bearing system to demonstrate the application of this newly developed SRB
model in a typical real world analysis. Accuracy of the model was verified by comparing
measured to predicted behaviors for equivalent systems.
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PL 20
53851 Lappeenranta
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