The turbomachinery bladed disks used in today’s advanced turbine engines must meet strict standards with regard to aeroelastic stability and forced resonant response. One structural characteristic of bladed disks that can significantly impact both of these areas is that of bladed disk mistuning. Mistuning occurs when some circumferential asymmetry exists in the bladed disk. This asymmetry can be due to such things as mass or stiffness eccentricity or slight variations in the individual blade properties and occurs in all bladed disks to a greater or lesser extent. One important structural phenomenon resulting from mistuning is the splitting of the bladed disk’s diametral modes of vibration into “twin” or “dual” modes. The presence of dual mode characteristics in a bladed disk can significantly affect either or both of its aeroelastic stability and resonant response characteristics. The present paper, expanding upon the earlier works of Tobias and Arnold [1] and of Ewins [2] addresses the prediction of the maximum resonant response of a mistuned bladed disk having closely spaced dual modes as a function of mode mistuning and modal damping. A closed form expression is derived for the maximum forced resonant response. A discussion of mistune and damping characteristics of typical turbomachinery bladed disks is also presented.
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April 1984
This article was originally published in
Journal of Vibration, Acoustics, Stress, and Reliability in Design
Research Papers
Maximum Resonant Response of Mistuned Bladed Disks
J. C. MacBain,
J. C. MacBain
Aero Propulsion Laboratory, Air Force Wright Aeronautical Laboratories, Wright-Patterson AFB, Ohio
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P. W. Whaley
P. W. Whaley
University of Nebraska, Lincoln, Nebraska
Search for other works by this author on:
J. C. MacBain
Aero Propulsion Laboratory, Air Force Wright Aeronautical Laboratories, Wright-Patterson AFB, Ohio
P. W. Whaley
University of Nebraska, Lincoln, Nebraska
J. Vib., Acoust., Stress, and Reliab. Apr 1984, 106(2): 218-223 (6 pages)
Published Online: April 1, 1984
Article history
Received:
June 17, 1983
Online:
November 23, 2009
Citation
MacBain, J. C., and Whaley, P. W. (April 1, 1984). "Maximum Resonant Response of Mistuned Bladed Disks." ASME. J. Vib., Acoust., Stress, and Reliab. April 1984; 106(2): 218–223. https://doi.org/10.1115/1.3269172
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