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Automatic identification of modal damping from Floquet analysis

Nagabhushanam, J and Gaonkar, GH (1995) Automatic identification of modal damping from Floquet analysis. In: Journal of the American Helicopter Society, 40 (2). pp. 39-42.

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Official URL: http://ahsjournal.org/resource/1/jhesak/v40/i2/p39...


A practical method is proposed to identify the mode associated with the frequency part of the eigenvalue of the Floquet transition matrix (FTM). From the FTM eigenvector, which contains the states and their derivatives, the ratio of the derivative and the state corresponding to the largest component is computed. The method exploits the fact that the imaginary part of this (complex) ratio closely approximates the frequency of the mode. It also lends itself well to automation and has been tested over a large number of FTMs of order as high as 250.

Item Type: Journal Article
Publication: Journal of the American Helicopter Society
Publisher: Amer Helicopter Soc Inc
Additional Information: Copyright of this article belongs to Amer Helicopter Soc Inc.
Department/Centre: Division of Mechanical Sciences > Aerospace Engineering(Formerly Aeronautical Engineering)
Date Deposited: 26 Apr 2011 10:19
Last Modified: 26 Apr 2011 10:19
URI: http://eprints.iisc.ac.in/id/eprint/37202

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