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Residual-flexibility corrections for transient modal rotordynamic modelsA modal residual-flexibility approach due to Schwendler and MacNeal (1962) is adapted to account for the 'static' contribution of higher-frequency modes without requiring their integration. It is assumed that each rotor mode acts as a lightly damped second-order system. The additional accuracy provided by residual-flexibility corrections becomes progressively more important as a modal model's actual boundary conditions are forced to deviate from the boundary conditions used to define the rotor's original structural model (stiffness matrix) and its associated eigendata input to the transient modal model. An analysis of the high-pressure-oxygen turbopump of the Space Shuttle main engine shows that the residual-flexibility approach ensures a substantial improvement in accuracy for a relatively moderate increase in computer-time requirements.
Document ID
19780051323
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Childs, D. W.
(Louisville, University Louisville, Ky., United States)
Bates, J. B., III
(Exxon Corp. New Orleans, La., United States)
Date Acquired
August 9, 2013
Publication Date
April 1, 1978
Subject Category
Mechanical Engineering
Report/Patent Number
ASME PAPER 77-DET-31
Accession Number
78A35232
Funding Number(s)
CONTRACT_GRANT: NAS8-31233
Distribution Limits
Public
Copyright
Other

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