Nonlinear dynamic analysis of multiple grooved water-lubricated journal bearings using attenuation rate interpolation method
Industrial Lubrication and Tribology
ISSN: 0036-8792
Article publication date: 23 November 2021
Issue publication date: 7 December 2021
Abstract
Purpose
The stringent requirements for environmental protection have induced the extensive applications of water-lubricated journal bearings in marine propulsion. The nonlinear dynamic analysis of multiple grooved water-lubricated bearings (MGWJBs) has not been fully covered so far in the literature. This study aims to conduct the nonlinear dynamic analysis of the instability for MGWJBs.
Design/methodology/approach
An attenuation rate interpolation method is proposed for the determination of the critical instability speed. Based on a structured mesh movement algorithm, the transient hydrodynamic force model of MGWJBs is set up. Furthermore, the parameters’ analysis of nonlinear instability for MGWJBs is conducted. The minimum water film thickness, side leakage, friction torque and power loss of friction are fully analyzed.
Findings
With the increase of speed, the journal orbits come across the steady state equilibrium motion, sub-harmonic motion and limit circle motion successively. At the limit circle motion stage, the orbits are much larger than that of steady state equilibrium and sub-harmonic motion. The critical instability speed increases when the spiral angle decreases or the groove angle increases. The minimum water film thickness peak is at the rotor speed of 4,000 r/min for the MGWJB with Sa = 0°. As rotor speed increases, the side leakage decreases slightly while the friction torque and the power loss of friction increase gradually.
Originality/value
Present research provides a beneficial reference for the dynamic mechanism analysis and design of MGWJBs.
Keywords
Acknowledgements
This work was supported by the National Natural Science Foundation of China (NO. 51506225, No. 52176050), the Key Research and Development Program of Shandong, China (NO. 2018GHY115018), the Fundamental Research Funds for the Central Universities (NO. 18CX02129A), the General Program of Natural Science Foundation of Shandong Province (NO. ZR2020ME174).
Citation
Li, Q., Liu, Q., Wang, Y., Zhang, S., Du, Y., Li, B. and Xu, W.-W. (2021), "Nonlinear dynamic analysis of multiple grooved water-lubricated journal bearings using attenuation rate interpolation method", Industrial Lubrication and Tribology, Vol. 73 No. 10, pp. 1342-1351. https://doi.org/10.1108/ILT-04-2021-0131
Publisher
:Emerald Publishing Limited
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