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Efficient vibration mode analysis of aircraft with multiple external store configurationsA coupling method for efficient vibration mode analysis of aircraft with multiple external store configurations is presented. A set of low-frequency vibration modes, including rigid-body modes, represent the aircraft. Each external store is represented by its vibration modes with clamped boundary conditions, and by its rigid-body inertial properties. The aircraft modes are obtained from a finite-element model loaded by dummy rigid external stores with fictitious masses. The coupling procedure unloads the dummy stores and loads the actual stores instead. The analytical development is presented, the effects of the fictitious mass magnitudes are discussed, and a numerical example is given for a combat aircraft with external wing stores. Comparison with vibration modes obtained by a direct (full-size) eigensolution shows very accurate coupling results. Once the aircraft and stores data bases are constructed, the computer time for analyzing any external store configuration is two to three orders of magnitude less than that of a direct solution.
Document ID
19890025191
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Karpel, M.
(NASA Langley Research Center Hampton, VA; Israel Aircraft Industries, Ltd., Lod, United States)
Date Acquired
August 13, 2013
Publication Date
August 1, 1988
Publication Information
Publication: Journal of Aircraft
Volume: 25
ISSN: 0021-8669
Subject Category
Aircraft Design, Testing And Performance
Accession Number
89A12562
Distribution Limits
Public
Copyright
Other

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