Subcritical behaviour of short cylindrical journal bearings under periodic excitation

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F49777513%3A23520%2F23%3A43968519" target="_blank" >RIV/49777513:23520/23:43968519 - isvavai.cz</a>
Result on the web
<a href="https://link.springer.com/article/10.1007/s11071-023-08372-3" target="_blank" >https://link.springer.com/article/10.1007/s11071-023-08372-3</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1007/s11071-023-08372-3" target="_blank" >10.1007/s11071-023-08372-3</a>

Result language
angličtina
Original language name
Subcritical behaviour of short cylindrical journal bearings under periodic excitation
Original language description
Rotating machinery supported on journal bearings is affected by forces due to rotating unbalance and pressure gradients in the oil film. The interaction of these forces can evoke nonlinear behaviour, including asynchronous motion and even chaos. This work attempts to characterise the sub-synchronous motion of the rigid rotor supported on cylindrical journal bearings due to the abovementioned interaction. The analysis focuses on the rotor behaviour at the rotor speeds lower than the threshold speed for oil whirl, associated with sub-synchronous vibration of magnitude equaling the bearing clearance. It is shown that the sub-synchronous vibration can occur well before reaching the threshold speed and that the underlying period-doubling bifurcation depends on the amount of the rotating unbalance. The rotor response and stability are analysed using a numerical continuation method employing the infinitely short journal bearing model. Continuation results are further validated by time simulations which utilise the finite difference method to compute the hydrodynamic forces. The validation process employs bifurcation diagrams, Poincaré sections and numerical estimates of the largest Lyapunov exponents.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
20302 - Applied mechanics

Project
<a href="/en/project/GA22-29874S" target="_blank" >GA22-29874S: Thermohydrodynamic effects of boundary slip and surface texturing in sliding contacts</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2023
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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