Technical note: The pitch damping of a hovering rigid rotor

Journal of the American Helicopter Society

Volumn 42, Issue 1, 1997, Pages 96-99

  Isser, Aharon ^a   Rosen, Aviv ^a  

^a TECHNION ISRAEL INSTITUTE OF TECHNOLOGY   (Israel)

Author keywords

[No Author keywords available]

Indexed keywords

CALCULATIONS; DAMPING; ERRORS; MATHEMATICAL MODELS; ROTATION; SPEED; THREE DIMENSIONAL; TURBOMACHINE BLADES; VORTEX FLOW;

AERODYNAMIC MODEL; GEOMETRIC EFFECTS; HOVERING RIGID ROTORS; PITCH DAMPING;

HELICOPTER ROTORS;

EID: 0030736156     PISSN: 00028711     EISSN: None     Source Type: Journal    
DOI: 10.4050/jahs.42.96     Document Type: Article

References (18)

1. Nikolsky, A.A., "Helicopter Analysis," New York, John Wiley & Sons, Inc., 1951, pp. 245.
2. Townsend, M.W., Jr., "Stability and Control of Unducted Stand-On Helicopters - Preliminary Theoretical and Flight Test Results," Princeton University, Department of Aeronautical Engineering, Report No. 404, Nov 1957. Appendix I.
3. Takasawa, K., "On the Pitch Damping Moment in Hovering of a Rigid Helicopter Rotor," NASA TT F-15,010, Sept 1973, 140 pp.
4. Takasawa, K., "On the Aerodynamic Damping Moment in Pitch of a Rigid Helicopter Rotor in Hovering. Part I. Experimental Phase," Transactions of the Japan Society for Aeronautical and Space Sciences, Vol. 16, (31), 1973, pp. 19-36.
5. Takasawa, K., "On the Aerodynamic Damping Moment in Pitch of a Rigid Helicopter Rotor in Hovering. Part II. Analytical Phase," Transactions of the Japan Society for Aeronautical and Space Sciences, Vol. 16, (32), 1973, pp. 77-101.
6. Theodorsen, T., "General Theory of Aerodynamic Instability and the Mechanism of Flutter," NACA TR-496, 1935.
7. Loewy, R.G., "A 2-D Approximation to the Unsteady Aerodynamics of Rotary Wings," J. of Aero. Sci., Vol. 24, (2), 1957, pp. 81-92.
8. Ashley, H., Moser, H.H. and Dugundji, J., "Investigation of Rotor Response to Vibratory Aerodynamic Inputs," WADC TR-58-87, Oct 1958.
9. Ichikawa, T., "Linear Aerodynamic Theory of Rotor Blades," J. Aircraft, Vol. 4, (3), 1967, pp. 210-218.
10. Sissingh, G.J., "The Effect of Induced Velocity Variation on Helicopter Rotor Damping in Pitch or Roll," Royal Aircraft Establishment, C.P. No. 101, Nov 1951, 16 pp.
11. Azuma, A. and Nakamura, Y., "Pitch Damping of Helicopter Rotor with Nonuniform Inflow," J. Aircraft, Vol. 11, (10), 1974, pp. 639-646.
12. Rosen, A. and Isser, A., "The Influence of Variations in the Locations of the Blades on the Loads of a Helicopter Rotor During Perturbations About an Axial Flight," TAE Report No. 721, Faculty of Aerospace Engineering, Technion - Israel Institute of Technology, Haifa, Israel, Oct 1994.
13. Isser, A. and Rosen, A., "A Model of the Unsteady Aerodynamics of a Hovering Helicopter Rotor that Includes Variations of the Wake Geometry," Journal of the American Helicopter Society, Vol. 40, (3), 1995, pp. 6-16.
14. Rosen, A. and Isser, A., "A New Model of Rotor Dynamics During Pitch and Roll of a Hovering Helicopter," Journal of the American Helicopter Society, Vol. 40, (3), 1995, pp. 17-28.
15. Rosen, A., Isser, A. and Yoshpe, M., "The Influence of Unsteady Aerodynamics and Inter-Blade Aerodynamic Coupling on the Blades Response to Harmonic Variations of Their Pitch Angles," The Aeronautical J., Vol. 100, (991), 1996, pp. 27-35.
16. Rosen A. and Isser, A., "A New Unsteady Aerodynamic Model of the Coupled Rotor-Body Dynamics," TAE Report No. 728, Faculty of Aerospace Engineering, Technion - Isrel Institute of Technology, Mar 1995.
17. Rosen, A. and Isser, A., "A New Unsteady Aerodynamic Model of the Coupled Rotor-Body Dynamics," Proceedings of the American Helicopter Society 51st Annual Forum, Fort Worth, TX, May 9-11, 1995, pp. 1763-1787. Condensed version appears as: "The Influence of Unsteady Aerodynamics Effects on the Coupled Free Vibrations of Rotor Flapping and Body Pitch and Roll in Hover," Journal of the American Helicopter Society, Vol. 41 (b), 1996, pp. 208-218.
18. Rosen, A. and Isser, A., "A New Unsteady Aerodynamic Model of the Coupled Rotor-Body Dynamics," Proceedings of the American Helicopter Society 51st Annual Forum, Fort Worth, TX, May 9-11, 1995, pp. 1763-1787. Condensed version appears as: "The Influence of Unsteady Aerodynamics Effects on the Coupled Free Vibrations of Rotor Flapping and Body Pitch and Roll in Hover," Journal of the American Helicopter Society, Vol. 41 (b), 1996, pp. 208-218.