Faculty of Mechanical Engineering, Lj. (FSLJ)
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A Smooth contact-state transition in a dynamic model of rolling-element bearingsRazpotnik, Matej ; Čepon, Gregor ; Boltežar, MihaWe present a new formulation to calculate the response of a system containing rolling-element bearings operating under a radial clearance and a dominant radial load. The nonlinear bearing force- and ... stiffness-displacement characteristics in combination with the bearing clearance necessitate an advanced numerical analysis. The response of a shaft-bearing-housing assembly can be unstable in the transient regions, e.g., at the start of a system run-up or when passing the critical speed of a system. This can lead to long computational times or even to non-converged solutions. In this paper, a new analytical bearing-stiffness model is presented that is capable of overcoming these problems by smoothing the nonlinear bearing force- and stiffness-displacement characteristics in the discontinuous regions. The smoothing is implemented on the deformation scale. The proposed model is modular, allowing us to define a specific value of the smoothing to each rolling element that comes into contact. A simple case study that involves two bearings of different types (ball and cylindrical roller) is presented. They support an unbalanced rotor, subjected to a constant angular acceleration. We show that a small smoothing value can significantly enhance the numerical calculation of the chosen system in terms of speed and stability.Source: Journal of sound and vibration. - ISSN 0022-460X (Vol. 430, Sep. 2018, str. 196-213)Type of material - article, component partPublish date - 2018Language - englishCOBISS.SI-ID - 16096795
Author
Razpotnik, Matej |
Čepon, Gregor |
Boltežar, Miha
Topics
dynamic bearing model |
smooth contact-state transition |
rolling-element bearing stiffness matrix |
unbalanced rotor |
kotalni ležaji |
glajenje kontaktnih stanj v dinamskem modelu kotalnega ležaja |
ležaji |
dinamika |
trdnost leažjev |
rotorji
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Database name | Field | Year |
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Links to authors' personal bibliographies | Links to information on researchers in the SICRIS system |
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Razpotnik, Matej | 37683 |
Čepon, Gregor | 25798 |
Boltežar, Miha | 02034 |
Source: Personal bibliographies
and: SICRIS
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