Experimental Evaluation of Multiplane-Multispeed Rotor Balancing Through Multiple Critical Speeds

[+] Author and Article Information
J. M. Tessarzik, R. H. Badgley

Machinery Dynamics Center, Mechanical Technology Inc., Latham, N. Y.

D. P. Fleming

Bearings and Mechanical Power Transfer Branch, National Aeronautics and Space Administration, Lewis Research Center, Cleveland, Ohio

J. Eng. Ind 98(3), 988-998 (Aug 01, 1976) (11 pages) doi:10.1115/1.3439062 History: Received May 27, 1975; Online July 15, 2010


Experimental tests have been conducted to further demonstrate the ability of the Influence Coefficient Method to achieve precise balance of flexible rotors of virtually any design for operation through virtually any speed range. Four distinct practical aspects of flexible-rotor balancing were investigated in the present work: (1) Balancing for operation through multiple bending critical speeds; (2) balancing of rotors mounted in both rigid and flexible bearing supports, the latter having significantly different stiffnesses in the horizontal and vertical directions so as to cause severe ellipticity in the vibration orbits; (3) balancing of rotors with various amounts of measured vibration response information (e.g., numbers of vibration data sets, and numbers and types of vibration sensors), and with different number of correction planes; (4) balancing of rotors with different (though arbitrary) initial unbalance configurations. Tests were made on a laboratory quality machine having a 122-cm (48-in.) long rotor weighing 50 kg (110 lb) and covering a speed range up to 18,000 rpm. The balancing method was found in every instance to be effective, practical, and economical, permitting safe rotor operation over the full speed range covering four rotor bending critical speeds.

Copyright © 1976 by ASME
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