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Lubricants 2018, 6(3), 81; https://doi.org/10.3390/lubricants6030081

Measured and Predicted Operating Characteristics of a Tilting-Pad Journal Bearing with Jacking-Oil Device at Hydrostatic, Hybrid, and Hydrodynamic Operation

Institute of Tribology and Energy Conversion Machinery, Clausthal University of Technology, 38678 Clausthal-Zellerfeld, Germany
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Received: 19 July 2018 / Revised: 20 August 2018 / Accepted: 30 August 2018 / Published: 10 September 2018
(This article belongs to the Special Issue Fluid-Film Lubrication)
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Abstract

Jacking-oil pockets are applied in many journals and thrust bearing applications in order to provide a hydrostatic oil film force that ensures a wear free run-up following a successful lift-off procedure. However, all components of the jacking-oil system have to be carefully designed in order to limit costs and prevent significant disturbance of hydrodynamic operation after deactivation of lift-oil. Experimental data and predictions for a four-pad tilting-pad journal bearing in load between pivot configuration are presented. Dynamic processes of the lift-off procedure as well as characteristic parameters of stationary conditions are studied. Moreover, hydrodynamic operation and hybrid lubrication providing a combined hydrodynamic and hydrostatic pressure distribution are investigated for sliding speeds up to 20 m/s. Analyzes of lift-off procedure prove that characteristic parameters such as lift-off pressures and vertical lift displacements are considerably influenced by manufacturing tolerances and misalignments. The comparison of hydrodynamic and hybrid lubrication provides a significant increase of load carrying capacity by additional jacking-oil supply at the maximum journal speed. In summary, results of measurements and predictions correlate well for all three investigated lubrication conditions. View Full-Text
Keywords: journal bearing; tilting-pad; jacking-oil; bearing test rig; lift-off; hydrostatic lubrication; hybrid lubrication; hydrodynamic lubrication journal bearing; tilting-pad; jacking-oil; bearing test rig; lift-off; hydrostatic lubrication; hybrid lubrication; hydrodynamic lubrication
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Hagemann, T.; Pfeiffer, P.; Schwarze, H. Measured and Predicted Operating Characteristics of a Tilting-Pad Journal Bearing with Jacking-Oil Device at Hydrostatic, Hybrid, and Hydrodynamic Operation. Lubricants 2018, 6, 81.

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