A test bench on rotors supported on air bearings floating on O-rings has been designed in order to study the whirling phenomenon and individuate the stability threshold with the presence of damping elements mounted on the bearings. The work contains description of the test bench and the first experimental results. A rotor of 1 kg mass and 37 mm diameter is rotated up to 75000 rpm by an air turbine manufactured on the rotor. Capacitance probes, placed in two radial planes, allow to scan the orbits of both the rotor and the bushing at different rotating speeds and proper load devices make it possible to measure the static and dynamic stiffness of the rotor-bearing system. Diagrams on the rotating response using different kinds of rubber O-rings are presented and compared, with also indications on the Fourier spectra of the signals relative to the rotor displacement. The phenomenon of whirling instability is showed, with considerations on the whirling frequency and on the orbit amplitudes of the rotor and the bearings. The effect of both supply pressure and angular velocity on the stability threshold is showed.
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ASME 8th Biennial Conference on Engineering Systems Design and Analysis
July 4–7, 2006
Torino, Italy
ISBN:
0-7918-4250-9
PROCEEDINGS PAPER
An Experimental Study on a High-Speed Rotor Supported by Air Bearings Mounted on O-Rings
G. Belforte,
G. Belforte
Politecnico di Torino, Torino, Italy
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T. Raparelli,
T. Raparelli
Politecnico di Torino, Torino, Italy
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V. Viktorov,
V. Viktorov
Politecnico di Torino, Torino, Italy
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F. Colombo
F. Colombo
Politecnico di Torino, Torino, Italy
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G. Belforte
Politecnico di Torino, Torino, Italy
T. Raparelli
Politecnico di Torino, Torino, Italy
V. Viktorov
Politecnico di Torino, Torino, Italy
F. Colombo
Politecnico di Torino, Torino, Italy
Paper No:
ESDA2006-95809, pp. 995-1000; 6 pages
Published Online:
September 5, 2008
Citation
Belforte, G, Raparelli, T, Viktorov, V, & Colombo, F. "An Experimental Study on a High-Speed Rotor Supported by Air Bearings Mounted on O-Rings." Proceedings of the ASME 8th Biennial Conference on Engineering Systems Design and Analysis. Volume 3: Dynamic Systems and Controls, Symposium on Design and Analysis of Advanced Structures, and Tribology. Torino, Italy. July 4–7, 2006. pp. 995-1000. ASME. https://doi.org/10.1115/ESDA2006-95809
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