Hostname: page-component-78c5997874-j824f Total loading time: 0 Render date: 2024-11-08T07:31:50.519Z Has data issue: false hasContentIssue false
  • English
  • Français

Response of Helicopter Rotor Blades to Random Loads near Hover

Published online by Cambridge University Press:  07 June 2016

C Lakshmikantham  and
C V Joga Rao
C Lakshmikantham
Affiliation:
Army Materials and Mechanics Research Center, Watertown, Massachusetts
C V Joga Rao
Affiliation:
Army Materials and Mechanics Research Center, Watertown, Massachusetts
Get access

Summary

The response of a flexible helicopter rotor blade to random loading is investigated, the random input being the vertical velocity component. The model takes into account blade flexibility in bending as well as torsion, and also general root rigidity. The spectral density and the mean square value of the transverse displacement are computed for both hingeless and hinged rotor blades and the results are evaluated.

Type
Research Article
Information
Aeronautical Quarterly , Volume 23 , Issue 4 , November 1972 , pp. 276 - 284
Copyright
Copyright © Royal Aeronautical Society. 1972

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. Stammers, C W The flutter of a helicopter rotor blade in forward flight. Aeronautical Quarterly, Vol XXI, pp 18-48, 1970.Google Scholar
2. Gaonkar, G H Hohenemser, K H Flapping response of lifting rotor blades to atmospheric turbulence. Journal of Aircraft, Vol 6, pp 496-502, 1969.CrossRefGoogle Scholar
3. Gaonkar, G H Hohenemser, A K H Stochastic properties of turbulence – excited rotor blade vibrations. AIA Paper No 70-548, 1970.Google Scholar
4. Miller, R H Ellis, C N Blade vibrations and flutter. Journal of the American Helicopter Society, Vol 1, 1956. Also Ham, N D, “Notes for UCLA Short Course on Helicopter Dynamics and Aerodynamics”, 1970.Google Scholar
5. Greenberg, J M Airfoil in sinusoidal motion in a pulsating stream. NACA TN 1526, 1947.Google Scholar
6. Bisplinghoff, R L Ashley, H Halfman, R L Aeroelasticity, Addison-Wesley, 1955.Google Scholar
7. Sveshnikov, A A Applied Methods of the Theory of Random Functions. English Translation by Pergamon Press, London, 1950.Google Scholar
8. Robson, J D An Introduction to Random Vibration. Elsevier, New York, 1964.Google Scholar
9. Cox, D R Miller, H D The Theory of Stochastic Processes. John Wiley, New York, 1965.Google Scholar
10. Ward, J F A summary of hingeless-rotor structural loads and dynamics research. Journal of Sound and Vibration, Vol 4, pp 358-377, 1966.CrossRefGoogle Scholar
11. Yntema, R T Simplified procedures and charts for the rapid estimation of bending frequencies of rotating beams. NACA TN 3459, 1955.Google Scholar