One type of test performed for evaluating bearings for application into turbomachinery is the synchronous bearing response to rotor imbalance. This paper presents rotordynamic tests on a rotor system using a 70 mm diameter damped gas bearing reaching ultra-high speeds of 50,000 rpm. The main objective of the study was to experimentally evaluate the ability of the damped gas bearing to withstand large rotor excursions and provide adequate damping through critical speed transitions. Two critical speeds were excited through varying amounts and configurations of rotor imbalance while measuring the synchronous rotordynamic response at two different axial locations. The results indicated a well-damped rotor system and demonstrated the ability of the gas bearing to safely withstand rotor vibration levels while subjected to severe imbalance loading. Also, a waterfall plot was used to verify ultra-high-speed stability of the rotor system throughout the speed range of the test vehicle. In addition to the experimental tests, a rotordynamic computer model was developed for the rotor-bearing system. Using the amplitude/frequency dependent stiffness and damping coefficients for the ball bearing support and the damped gas-bearing support, a pseudononlinear rotordynamic response to imbalance was performed and compared with the experiments.
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e-mail: ertas@research.ge.com
e-mail: massimo.camatti@ge.com
e-mail: gabriele.mariotti@ge.com
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March 2010
Research Papers
Synchronous Response to Rotor Imbalance Using a Damped Gas Bearing
Bugra H. Ertas,
Bugra H. Ertas
Rotating Equipment Group, Vibration and Dynamics Laboratory,
e-mail: ertas@research.ge.com
GE Global Research Center
, Niskayuna, NY 12309
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Massimo Camatti,
Massimo Camatti
Conceptual Design, Advanced Technology,
e-mail: massimo.camatti@ge.com
GE Oil and Gas
, Florence, Italy FI-50127
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Gabriele Mariotti
Gabriele Mariotti
Mechanical Design, Turboexpander Division,
e-mail: gabriele.mariotti@ge.com
GE Oil and Gas
, Florence, Italy FI-50127
Search for other works by this author on:
Bugra H. Ertas
Rotating Equipment Group, Vibration and Dynamics Laboratory,
GE Global Research Center
, Niskayuna, NY 12309e-mail: ertas@research.ge.com
Massimo Camatti
Conceptual Design, Advanced Technology,
GE Oil and Gas
, Florence, Italy FI-50127e-mail: massimo.camatti@ge.com
Gabriele Mariotti
Mechanical Design, Turboexpander Division,
GE Oil and Gas
, Florence, Italy FI-50127e-mail: gabriele.mariotti@ge.com
J. Eng. Gas Turbines Power. Mar 2010, 132(3): 032501 (9 pages)
Published Online: December 1, 2009
Article history
Received:
March 19, 2009
Revised:
March 22, 2009
Online:
December 1, 2009
Published:
December 1, 2009
Citation
Ertas, B. H., Camatti, M., and Mariotti, G. (December 1, 2009). "Synchronous Response to Rotor Imbalance Using a Damped Gas Bearing." ASME. J. Eng. Gas Turbines Power. March 2010; 132(3): 032501. https://doi.org/10.1115/1.3157097
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