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Numerical and experimental study on dynamic characteristics of tilting-pad journal bearings considering pivot stiffness in a vertical rotor system

Fan Zhang (Engineering Research Center of Heavy Machinery of Ministry of Education,Taiyuan University of Science and Technology Taiyuan China)
Peng Yin (Engineering Research Center of Heavy Machinery of Ministry of Education,Taiyuan University of Science and Technology Taiyuan China)
Yuyang Liu (Engineering Research Center of Heavy Machinery of Ministry of Education,Taiyuan University of Science and Technology Taiyuan China)
Jianmei Wang (Engineering Research Center of Heavy Machinery of Ministry of Education,Taiyuan University of Science and Technology Taiyuan China)

Industrial Lubrication and Tribology

ISSN: 0036-8792

Article publication date: 18 October 2021

Issue publication date: 7 December 2021

179

Abstract

Purpose

The purpose of this paper is to study the influence of pivot stiffness on the dynamic characteristics of tilting-pad journal bearings (TPJBs) and the stability of the bearing-rotor system.

Design/methodology/approach

A theoretical numerical model is established, and the influences of pivot stiffness on TPJBs and a bearing-rotor system are analyzed. Then, two kinds of pivot structures with different stiffness are designed and the vibration characteristics are tested on the vertical rotor bearing test bench.

Findings

The pivot stiffness has an obvious effect on the dynamic characteristics of the TPJBs and the stability of the bearing-rotor system. As a result of appropriate pivot stiffness, the critical speed and the vibration amplification factor can be reduced, the logarithmic decay rate and the stability of the rotor system can be effectively increased. While the journal whirl orbit is smoother and the rubbing is obviously reduced when the bearings have flexible pivots.

Originality/value

The influence of pivot stiffness on TPJBs and a vertical rotor-bearing system is studied by theoretical and experimental methods.

Keywords

Acknowledgements

This work was supported in part by the National Natural Science Foundation of China (NO. 51805409), Doctoral Research Fund Project of Taiyuan University of Science and Technology (NO. 20202010), Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi (NO.2020L0357 and NO. 2019L0654) and China Postdoctoral Science Foundation (NO.2019M653587).

Citation

Zhang, F., Yin, P., Liu, Y. and Wang, J. (2021), "Numerical and experimental study on dynamic characteristics of tilting-pad journal bearings considering pivot stiffness in a vertical rotor system", Industrial Lubrication and Tribology, Vol. 73 No. 10, pp. 1275-1285. https://doi.org/10.1108/ILT-04-2021-0108

Publisher

:

Emerald Publishing Limited

Copyright © 2021, Emerald Publishing Limited

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