Hostname: page-component-5f745c7db-xx4dx Total loading time: 0 Render date: 2025-01-06T08:09:26.084Z Has data issue: true hasContentIssue false
  • English
  • Français

A simplified approach to helicopter ground resonance

Published online by Cambridge University Press:  04 July 2016

Q. T. S. Done
Q. T. S. Done*
Affiliation:
Department of Mechanical Engineering, University of Edinburgh
Get access Rights & Permissions [Opens in a new window]

Extract

The theory of the self-excited oscillation of the hinged blades of a helicopter rotor has been treated by Coleman and Feingold and their paper, although written several years ago, remains a standard reference on the subject. Since then, the scope of theoretical studies and calculations has been broadened to include hingeless rotors, more degrees of freedom and blade aerodynamic forces. All this has led inevitably to a great complexity in the equations of motion, with the result that, although the dynamicist can perform adequate calculations, he loses the insight and physical appreciation that he needs, for example, to identify the important parameters in the system. In order to maintain these qualities a different mathematical model is required, one that retains only the most basic parameters and yet still exhibits the fundamental ground resonance instability.

Type
Technical Notes
Information
The Aeronautical Journal , Volume 78 , Issue 761 , May 1974 , pp. 204 - 208
Copyright
Copyright © Royal Aeronautical Society 1974 

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

1. Coleman, R. P. and Feingold, A. M. Theory of self-excited mechanical oscillations of helicopter rotors with hinged blades. NACA Report 1351, 1958.Google Scholar
2. Ellis, D. V. Derivation of ground resonance equations. Unpublished Note, Westland Helicopters Ltd.Google Scholar
3. Zieoler, H. Principles of structural stability. Blaisdell, 1968.Google Scholar
4. Halfman, R. L. Dynamics. Vol II: Systems–Variational methods and relativity. Addison-Wesley, 1962.Google Scholar
5. Done, G. T. S. Helicopter ground resonance in two degrees of freedom. Unpublished Note, Westland Helicopters Ltd, 1971.Google Scholar
6. Done, G. T. S. A study of binary flutter roots using a method of system synthesis. ARC R and M 3554, 1969.Google Scholar
7. Price, H. L. Simplified helicopter ground resonance stability boundaries. Aircraft Engineering. Vol 34, Nos 404 and 405, 1962.Google Scholar
8. King, S. Simplified ground resonance analysis. Unpublished Note, Westland Helicopters Ltd, 1972.Google Scholar