Journal of Mechanical Science and Technology

The Korean Society of Mechanical Engineers (대한기계학회)
권호 표지

Diagnosis of Excessive Vibration Signals of Two-Pole Generator Rotors in Balancing

  • Park, Jong-Po (R&D Center Korea Heavy Industries & Construction Co., Ltd.)
  • Published : 2000.06.01
Download PDF
⟨ Previous Next ⟩

Abstract

Cause of excessive vibration with twice the rotational speed of a two-pole generator rotor for the fossil power plants was investigated. The two-pole generator rotor, treated as a typically asymmetric rotor in vibration analysis, produces asynchronous vibration with twice the rotational speed, sub-harmonic critical speeds, and potentially unstable operating zones due to its own inertia and/or stiffness asymmetry. This paper introduces a practical balancing procedure, and presents the results of the investigation on sources of the excessive vibration based on the experimental vibration data of the asymmetric two-pole rotor in balancing.

Keywords

References

  1. Collacott, Ralph A., 1979, Vibration Monitoring and Diagnosis, John Wiley & Sons
  2. Darlow, Mark S., 1989, Balancing of High-Speed Machinery, Springer-Verlag
  3. Dimarogonas, Andrew D., and Haddad, S., 1992, Vibration for Engineers, Prentice-Hall
  4. Ehrich, Fredric F., 1992, Handbook of Rotor-dynamics, McGraw-Hill
  5. Hanjung, 1996, Engineering Process Instruction for Factory Balance, Hanjung
  6. Lee, C. W., 1993, Vibration Analysis of Rotors, Kluwer Academic Publishers
  7. Lee, C. W., and Joh, C. Y., 1994, 'Use of Directional Spectra for Diagnosis of Asymmetry/Anisotropy in Rotor Systems,' Proc. 4th Int. Conf. on Rotor Dynamics, Chicago, USA, pp. 97-101
  8. Watanabe, T., 1996, 'Thermal vibration Balancing Method for Turbine Generator Rotor: Rotor Vibration Analysis Method due to Thermal Unbalance,' J. of JSME, Vol. 62(599), pp. 12-19, in Japaness
  9. Wowk, V., 1991, Machinery Vibration: Measure-ment and Analysis, McGraw-Hill