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A generalized multiple-input, multiple-output modal parameter estimation algorithmA new method for experimental determination of the modal parameters of a structure is presented. The method allows for multiple input forces to be applied simultaneously, and for an arbitrary number of acceleration response measurements to be employed. These data are used to form the equations of motion for a damped linear elastic structure. The modal parameters are then obtained through an eigenvalue technique. In conjunction with the development of the equations, an extensive computer simulation study was performed. The results of the study show a marked improvement in the mode shape identification for closely-spaced modes as the number of applied forces is increased. Also demonstrated is the influence of noise on the method's ability to identify accurate modal parameters. Here again, an increase in the number of exciters leads to a significant improvement in the identified parameters.
Document ID
19840048949
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Craig, R. R., Jr.
(Texas, University Austin, TX, United States)
Blair, M. A.
(Lockheed Missiles and Space Co., Inc. Sunnyvale, CA, United States)
Date Acquired
August 12, 2013
Publication Date
January 1, 1984
Subject Category
Cybernetics
Report/Patent Number
AIAA PAPER 84-1050
Accession Number
84A31736
Funding Number(s)
CONTRACT_GRANT: NAS8-33980
Distribution Limits
Public
Copyright
Other

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