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TECHNICAL PAPERS: Gas Turbines: Structures and Dynamics

Rotor Balancing Without Trial Weights

[+] Author and Article Information
A. El-Shafei, A. S. El-Kabbany, A. A. Younan

Faculty of Engineering, Department of Mechanical Design and Production, Cairo University, Giza 12316, Egypt

J. Eng. Gas Turbines Power 126(3), 604-609 (Aug 11, 2004) (6 pages) doi:10.1115/1.1762903 History: Received December 01, 2001; Revised March 01, 2002; Online August 11, 2004
Copyright © 2004 by ASME
Topics: Rotors , Vibration
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References

Thearle,  E. L., 1934, “Dynamic Balancing of Rotating Machinery in the Field,” Trans. ASME, 56, pp. 745–753.
Goodman,  T. P., 1964, “A Least-Squares Method for Computing Balance Corrections,” J. Eng. Ind., 86(3), pp. 273–279.
Bishop,  R. E. D., and Parkinson,  A. G., 1963, “On the Isolation of Modes in the Balancing of Flexible Shafts,” Proc. Inst. Mech. Eng., 177, pp. 407–423.
El-Shafei,  A., 2001, “Static-Couple Balancing of Overhung Rotors,” Vibrations,17(1), pp. 6–11.
Hundal,  M. S., and Harker,  R. J., 1966, “Balancing of Flexible Rotors Having Arbitrary Mass and Stiffness Distributions,” J. Eng. Ind., 88, pp. 217–233.
Palazzolo, A. B., and Gunter, E. J., 1977, “Modal Balancing Without Trial Weights by a Modified Nyquist Plot Procedure,” Vibration Institute, Machinery Vibration Seminar, Cherry Hill, NJ, Nov.
Gash,  R., and Drechsler,  J., 1978, “Modales Auswuchter Elastischer Laufer Ohne Testgewichtssetzungen,” Colloid Sci., (320), pp. 45–54.
Morton,  P. G., 1985, “Modal Balancing of Flexible Shafts Without Trial Weights,” Proc. Inst. Mech. Eng., 199(C1), pp. 71–78.
Meacham, W. L., Brawley, G. H., and Molis, S. J., 1986, “Balancing of Large Steam Turbine-Generator Using MoBal,” EPRI Rotating Machinery Dynamics, Bearings and Seals Symposium, St. Louis, MO, Sept. 9–11.
Wiese, D., 1992, “Two New Procedures to Balance Flexible Rotors Without Test Runs,” Proceedings of the 5th International Conference on Vibrations in Rotating Machinery, Bath, England, IMechE, London, pp. 557–568.
Preciado, E., and Bannister, R. H., 2000, “On the Balancing of Flexible Rotors Without Trial Runs,” Proceedings of the 7th International Conference on Vibrations in Rotating Machinery, Nottingham, England, IMechE, London, pp. 121–130.
RIMAP User Guide, 2000, Version 1.2, RITEC, Egypt.
Ewins, D. J., 1986, Modal Testing: Theory and Practice, Research Studies Press Ltd.
Kreuzinger-Janik, T., and Irretier, H., 2000, “Unbalance Identification of Flexible Rotors Based on Experimental Modal Analysis,” Proceedings of the 7th International Conference on Vibrations in Rotating Machinery, Nottingham, England, IMechE, London, pp. 335–346.

Figures

Grahic Jump Location
Bode plot produced by the preliminary model
Grahic Jump Location
Bode plot calculated from the calibrated model
Grahic Jump Location
Vibration measurements before and after balancing

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