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Similarity Design of Rotary Machine’s Bearing Parameters

[+] Author Affiliations
Shenjian Su, Liming Wang, Ping Li, Jianli Zuo

Research Institute of Physical and Chemical Engineering of Nuclear Industry (IPCE), TianJin, China

Paper No. GT2009-59774, pp. 929-934; 6 pages
doi:10.1115/GT2009-59774
From:
  • ASME Turbo Expo 2009: Power for Land, Sea, and Air
  • Volume 6: Structures and Dynamics, Parts A and B
  • Orlando, Florida, USA, June 8–12, 2009
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-4887-6 | eISBN: 978-0-7918-3849-5
  • Copyright © 2009 by ASME

abstract

The bearing parameters, which dominate the dynamic behavior of the rotary machine, should be optimized so that the machine can successfully pass through the critical speed and stably run at the operating speed. However, the parametric optimization usually needs complicated numerical calculation and a great deal of experimentation, especially for the high-speed vertical machine studied here, the dynamic behavior of which is even more sensitive to the parameters. Whereas, the new-style rotor is of similar structure with the old-style rotor. The difference between the two types of rotors is that the new-style rotor’s length and diameter are 1.3 times of the old-style rotor. So it is feasible that the parametric optimization of new-style bearings is carried out by the similarity principle. The similarity principle is that the ratio between the new-style rotor’s whirl energy with the old-style rotor’s equals the ratio between the new-style rotor’s dissipation energy imposed by the bottom bearing with the old-style rotor’s when they run at the operating speed. The parametric optimization involved in this paper only needs simple numerical operation and a little experimentation and makes the new-style bearing parameters design much faster and cheaper than the old-style.

Copyright © 2009 by ASME
Topics: Bearings , Design

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