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Does the Phugoid Frequency Depend on Speed?

Pradeep, S and Kamesh, S (1999) Does the Phugoid Frequency Depend on Speed? In: Journal of Guidance Control And Dynamics, 22 (2). pp. 372-373.

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THE phugoidfrequencyis thoughtto be inverselyproportionalto the forward speed, although this has never been proved. Three counterexamples to this conviction are presented. Subsequently, it is shown that if the speed alone is varied, keeping the aerodynamic and thrust derivatives fixed by some means, the phugoid frequency remains unchanged, establishing that the phugoid frequency is independentof speed. The widespreadbelief of the dependencyof the phugoid frequency on speed perhaps results from the fact that, in most instances,the aerodynamicderivativesvary with speed in such a manner as to make the phugoid time period roughly proportional to the speed.

Item Type: Journal Article
Publication: Journal of Guidance Control And Dynamics
Publisher: American Institute of Aeronautics and Astronautics
Additional Information: Copyright of this article belongs to American Institute of Aeronautics and Astronautics.
Department/Centre: Division of Mechanical Sciences > Aerospace Engineering(Formerly Aeronautical Engineering)
Date Deposited: 01 Jun 2009 08:44
Last Modified: 01 Jun 2009 08:44
URI: http://eprints.iisc.ac.in/id/eprint/18659

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