Optimized aeroelastic couplings for alleviation of helicopter ground resonance

Journal of Aircraft

Volumn 35, Issue 4, 1998, Pages 582-590

  Gandhi, Farhan ^a,b,c   Hathaway, Eric ^a,b,c  

^a PENNSYLVANIA STATE UNIVERSITY   (United States)

^b Rotorcraft Center of Excellence   (United States)

^c AIAA   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

DAMPING; HELICOPTER ROTORS; ITERATIVE METHODS; OPTIMIZATION; SPEED;

AEROELASTIC COUPLING; HELICOPTER GROUND RESONANCE; ROTATIONAL SPEED;

AERODYNAMICS;

EID: 0032119906     PISSN: 00218669     EISSN: 15333868     Source Type: Journal    
DOI: 10.2514/2.2341     Document Type: Article

References (21)

1. Chopra, I., "Perspectives in Aeromechanical Stability of Helicopter Rotors," Vertica, Vol. 14, No. 4, 1990, pp. 457-508.
2. Ormiston, R. A., "The Challenge of the Damperless Rotor," Proceedings of the 22nd European Rotorcraft Forum (Brighton, England, UK), 1996, pp. 27.1-27.14.
3. Gandhi, F., "Concepts for Damperless Aeromechanically Stable Rotors," Proceedings of the Innovation in Rotorcraft Technology Conference, Royal Aeronautical Society, London, 1997, pp. 14.1-14.31.
4. Young, M. I., and Bailey, D. J., "Stability and Control of Hingeless Rotor Helicopter Ground Resonance," Journal of Aircraft, Vol. 11, No. 6, 1974, pp. 333-339.
5. Straub, F. K., and Warmbrodt, W., "The Use of Active Controls to Augment Rotor/Fuselage Stability," Journal of the American Helicopter Society, Vol. 30, No. 3, 1985, pp. 13-22.
6. Straub, F. K., "Optimal Control of Helicopter Aeromechanical Stability," Vertica, Vol. 11, No. 3, 1987, pp. 425-435.
7. Weller, W. H., "Fuselage State Feedback for Aeromechanical Stability Augmentation of a Bearingless Rotor," Journal of the American Helicopter Society, Vol. 41, No. 2, 1996, pp. 85-93.
8. Gandhi, F., and Weller, W. H., "Active Aeromechanical Stability Augmentation Using Fuselage State Feedback," Proceedings of the 53rd Annual Forum of the American Helicopter Society (Virginia Beach, VA), 1997, pp. 1350-1362.
9. Ormiston, R. A., "Techniques for Improving the Stability of Soft Inplane Hingeless Rotors," NASATN X-62390, Oct. 1974.
10. Bousman, W. G., Sharpe, D. L., and Ormiston, R. A., "An Experimental Study of Techniques for Increasing the Lead-Lag Damping of Soft Inplane Hingeless Rotors," Proceedings of the 32nd Annual National V/STOL Forum of the American Helicopter Society (Washington, DC), 1976, pp. 1035.1-1035.12.
11. Bousman, W. G., "The Effects of Structural Flap-Lag and Pitch-Lag Coupling on Soft Inplane Hingeless Rotor Stability in Hover," NASA TP 3002, May 1990.
12. Ormiston, R. A., "Aeromechanical Stability of Soft Inplane Hingeless Rotor Helicopters," Proceedings of the 3rd European Rotorcraft and Powered Lift Aircraft Forum (Aix-en-Provence, France), 1977, pp. 25.1-25.22.
13. Bousman, W. G., "An Experimental Investigation of the Effects of Aeroelastic Couplings on Aeromechanical Stability of a Hingeless Rotor Helicopter," Journal of the American Helicopter Society, Vol. 26, No. 1, 1981, pp. 46-54.
14. Ormiston, R. A., "Investigations of Hingeless Rotor Stability," Vertica, Vol. 7, No. 2, 1983, pp. 143-181.
15. King, S. P., "The Effect of Pitch-Flap and Pitch-Lag Coupling on Air Resonance," Dynamics Dept., Westland Helicopters, Ltd., Yeovil, Rept. GEN/DYN/RES/005R, July 1971.
16. Nagabhushanam, J., and Gaonkar, G. H., "Rotorcraft Air Resonance in Forward Flight with Various Dynamic Inflow Models and Aeroelastic Couplings," Proceedings of the 9th European Rotorcraft Forum (Stresa, Italy), 1983, pp. 52.1-52.24.
17. Milgram, J. H., and Chopra, I., "Air Resonance of Hingeless Rotor Helicopters in Trimmed Forward Flight," Journal of the American Helicopter Society, Vol. 39, No. 4, 1994, pp. 46-58.
18. Zotto, M. D., and Loewy, R. G., "Influence of Pitch-Lag Coupling on Damping Requirements to Stabilize Ground/Air Resonance," Journal of the American Helicopter Society, Vol. 37, No. 4, 1992, pp. 68-71.
19. Venkatesan, C., "Influence of Aeroelastic Couplings on Coupled Rotor/Body Dynamics," 6th International Workshop on Dynamics and Aeroelastic Stability Modeling of Rotorcraft Systems, Los Angeles, CA, Nov. 1995.
20. Ormiston, R. A., and Hodges, D. H., "Linear Flap-Lag Dynamics of Hingeless Helicopter Rotor Blades in Hover," Journal of the American Helicopter Society, Vol. 17, No. 2, 1972, pp. 2-15.
21. Peters, D. A., and HaQuang, N., "Dynamic Inflow for Practical Applications," Journal of the American Helicopter Society, Vol. 33, No. 4, 1988, pp. 64-68.