NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
In-plane inertial coupling in tuned and severely mistuned bladed disksA model has been developed and verified for blade-disk-shaft coupling in rotors due to the in-plane rigid body modes of the disk. An analytic model has been developed which couples the in-plane rigid body modes of the disk on an elastic shaft with the blade bending modes. Bench resonance test were carried out on the M.I.T. Compressor Rotor, typical of research rotors with flexible blades and a thick rigid disk. When the rotor was carefully tuned, the structural coupling of the blades by the disks was confined to zero and one nodal diameter modes, whose modal frequencies were greater than the blade cantilever frequency. In the case of the tuned rotor, and in two cases where severe mistuning was intentionally introduced, agreement between the predicted and observed natural frequencies is excellent. The analytic model was then extended to include the effects of constant angular rotation of the disk.
Document ID
19820051925
Document Type
Conference Paper
Authors
Crawley, E. F. (MIT Cambridge, MA, United States)
Date Acquired
August 10, 2013
Publication Date
April 1, 1982
Subject Category
MECHANICAL ENGINEERING
Report/Patent Number
ASME PAPER 82-GT-288
Meeting Information
International Gas Turbine Conference and Exhibit(London)
Funding Number(s)
CONTRACT_GRANT: NSG-3079
Distribution Limits
Public
Copyright
Other