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A guide to classical flutter

Published online by Cambridge University Press:  04 July 2016

L. T. Niblett
L. T. Niblett*
Affiliation:
Materials and Structures Department Royal Aerospace Establishment, Farnborough
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Summary

First essentials of classical flutter are demonstrated by a comprehensive study of the behaviour of a lifting surface with two degrees of freedom under the action of airforces limited to those in phase with displacement. Structural coupling between the coordinates is eliminated by taking the normal modes to be the deflection coordinates, and this results in conditions for stability with particularly concise forms. It is shown that the flutter stability can be seen to be very much a matter of the relative amplitudes of heave and pitch in the normal modes.

In-quadrature airforces are then introduced and it is shown that they have little effect when the flutter is severe. They are of more importance in the milder forms of flutter, the extreme of which are shown to be little different from instabilities in a single degree of freedom.

Type
Research Article
Information
The Aeronautical Journal , Volume 92 , Issue 919 , November 1988 , pp. 339 - 355
Copyright
Copyright © Royal Aeronautical Society 1988 

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Footnotes

*

Now retired.

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