A dynamic model considering the time-varying friction moment of a flexible rotor system
ISSN: 0264-4401
Article publication date: 12 July 2023
Issue publication date: 14 July 2023
Abstract
Purpose
Bearing friction moments are important factors that affect the vibrations of rotor systems. The bearing friction moments are related to the dimension parameters, lubrication conditions and manufacturing errors of support bearings. This work studies the effects of the bearing friction moments on the vibrations of rotor systems.
Design/methodology/approach
The rotor is separated into several shaft elements for formulating a flexible rotor. The time-varying friction moment (TFM) is affected by the time-varying contact loads. The vibrations of FRS from the TFM and Palmgren's friction moment (PFM) calculation methods are compared. Moreover, the effects of the rotor offset and radial clearance on the frequency-amplitude characteristics of FRS are studied.
Findings
The TFM method is more consistent with the actual operation mechanisms. The rotor offset and radial clearance can significantly affect the nonlinear vibrations of FRS. This work provides a new reference and research method for the vibration analysis of rotor systems considering the friction effects.
Originality/value
The elastohydrodynamic lubrication (EHL), elastic hysteresis and differential sliding are considered. A flexible rotor system (FRS) dynamic model considering the TFM is proposed. The vibrations of FRS from the TFM calculation method and empirical calculation formula are compared. The effects of the rotor offset and radial clearance on the frequency–amplitude characteristics of FRS are studied.
Keywords
Acknowledgements
Funding: The study was funded by National Natural Science Foundation of China under Contract No. 51975068 and 52175120 and Natural Science Foundation of Chongqing under Contract No. cstc2019jcyj-msxmX0023 and CSTB2022NSCQ-MSX0318.
Citation
Liu, J., An, Y., Fancheng, W., Tang, C. and Xu, L. (2023), "A dynamic model considering the time-varying friction moment of a flexible rotor system", Engineering Computations, Vol. 40 No. 5, pp. 1128-1146. https://doi.org/10.1108/EC-12-2021-0707
Publisher
:Emerald Publishing Limited
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