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Balancing of a power-transmission shaft with the application of axial torqueEvaluation of power transmission shafting for high-speed balancing has shown that when axial torque is applied, the imbalance response is altered. An increase in synchronous excitation always occurs if the axial torque level is altered from the value used during balancing; this was the case even when the shaft was balanced with torque applied. The twisting of the long slender shaft produces a change in the imbalance distribution sufficient to disrupt the balanced state. This paper presents a review of the analytic development of a weighted least squares approach to influence coefficient balancing and a review of experimental results. The analytic approach takes advantage of the fact that the past testing has shown that the influence coefficients are not significantly affected by the application of axial torque. The 3.60-m (12-ft) long aluminum shaft, 7.62 cm (3 in.) in diameter was run through the first flexural critical speed at torque levels ranging from zero-torque to 903.8 N-M (8000 lb-in.) in 112.9 N-M (1000 lb-in.) increments. Good comparison was achieved between predicted and experimental results.
Document ID
19800058086
Document Type
Conference Paper
Authors
Zorzi, E. S. (Mechanical Technology, Inc. Latham, N.Y., United States)
Flemming, D. (NASA Lewis Research Center Cleveland, Ohio, United States)
Date Acquired
August 10, 2013
Publication Date
March 1, 1980
Subject Category
MECHANICAL ENGINEERING
Report/Patent Number
ASME PAPER 80-GT-143
Meeting Information
Gas Turbine Conference and Products Show(New Orleans, LA)
Distribution Limits
Public
Copyright
Other