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Evaluation of Q-Values of a Rotor-Bearing System Using a Modal Open Loop Transfer Function

[+] Author Affiliations
Hiroyuki Fujiwara, Hiroto Oyama, Osami Matsushita

National Defense Academy, Yokosuka, Kanagawa, Japan

Yasuo Fukushima, Naohiko Takahashi

Hitachi Plant Technologies, Ltd., Tsuchiura, Ibaraki, Japan

Paper No. GT2009-59723, pp. 901-908; 8 pages
  • 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


As indicated by ISO standard 10816, Q-value estimation is very important for rotating machinery commission and/or machine safety operation. Impulse tests and resonance curve measurements are commonly contributed to Q-value estimation. Instead of two methods, we are developing a new method using open-loop transfer function (Go) at real operational condition. In this paper, we present a theoretical background on how to measure the open loop transfer function. Our key technique is the measurement of the modal coordinates with a combination of several displacement sensors. Concerning the experimental measurement of Go , we use multiple sensors and only one active magnetic bearing (AMB) in a rotor system supported by oil-film/ball bearing. This Go is converted to damping ratio. In fact, a smaller damping ratio is recognized just before oil-whip instability by our open loop measurement. In addition, we set a dynamic damper which has been developed for suppression of oil whip instability, and an increasing damping ratio is also recognized by our method.

Copyright © 2009 by ASME



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