Journal
PRECISION ENGINEERING-JOURNAL OF THE INTERNATIONAL SOCIETIES FOR PRECISION ENGINEERING AND NANOTECHNOLOGY
Volume 76, Issue -, Pages 340-359Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.precisioneng.2022.04.002
Keywords
Foil-air bearings; Vibration control; Rotordynamics; Nonlinear systems
Categories
Funding
- Engineering and Physical Sciences Research Council of the UK
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Introducing a lobed clearance profile into a foil-air bearing can delay instability speed and suppress sub-synchronous vibration; redesigning the motorized micrometer screw assemblies can achieve real-time preload control and higher shaft speeds; experiments show preload can eliminate sub-synchronous vibration but may increase friction torque.
The introduction of a lobed clearance profile into a foil-air bearing can improve rotordynamic performance through the delay of the onset of instability speed and consequent suppression of sub-synchronous vibrations. This can be achieved by shimming (preloading) the foil at three angular locations along its interface with the sleeve. This paper presents the design, manufacture and testing of a rotor test rig with a novel controllable preload foil-air bearing design. The design's motorised micrometer screw assemblies securely prescribe a given preload in real time, eliminating the introduction of potential problems associated with the structural compliance of piezoelectric preloading mechanisms. The shaft of a previous test rig is redesigned to achieve a significantly higher speed with the same motor. The design work is guided by simulations. Experiments confirm that the projected preload is sufficient to virtually eliminate sub-synchronous vibration over the operating speed range. The experiments also confirm that the top speed could be significantly increased by redesigning the shaft for a higher bending critical speed. Although preload increases the friction torque, this is mitigated through the application of diamond-like carbon to the journal, and can be further mitigated by applying preload only in regimes of sub-synchronous vibration activity.
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