Influence of balanced rotor anisotropy on helicopter aeromechanical stability

AIAA journal

Volumn 37, Issue 10, 1999, Pages 1152-1160

  Gandhi, Farhan ^a   Malovrh, Brendon ^a  

^a PENNSYLVANIA STATE UNIVERSITY   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

AERODYNAMIC LOADS; ANISOTROPY; DAMPING; ELASTICITY; STIFFNESS; VIBRATIONS (MECHANICAL);

HELICOPTER ROTOR BLADES;

HELICOPTER ROTORS;

EID: 0032595444     PISSN: 00011452     EISSN: None     Source Type: Journal    
DOI: 10.2514/2.600     Document Type: Article

References (26)

1. Chopra, I., "Perspectives in Aeromechanical Stability of Helicopter Rotors," Vertica, Vol. 14, No. 4, 1990, pp. 457-508.
2. Ormiston, R. A., "Aeromechanical Stability of Soft Inplane Hingeless Rotor Helicopters," Proceedings of the Third European Rotorcraft and Powered Lift Aircraft Forum, Aix-en-Provence, France, 1977.
3. Bousman, W. G., "An Experimental Investigation of the Effects of Aeroelastic Couplings on Aeromechnaical Stability of a Hingeless Rotor Helicopter," Journal of the American Helicopter Society, Vol. 26, No. 1, 1981, pp. 46-54.
4. Ormiston, R. A., "Investigations of Hingeless Rotor Stability," Vertica, Vol. 7, No. 2, 1983, pp. 143-181.
5. King, S. P, "The Effect of Pitch-Flap and Pitch-Lag Coupling on Air Resonance," Westland Helicopters, Ltd., Dynamics Dept., Rept. GEN/ DYN/RES/005R, Yeovil, England, UK, July 1971.
6. Nagabhushanam, J., and Gaonkar, G. H., "Rotorcraft Air Resonance in Forward Flight with Various Dynamic Inflow Models and Aeroelastic Couplings," Proceedings of the Ninth European Rotorcraft Forum, Stresa, Italy, 1983.
7. 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.
8. Venkatesan, C., "Influence of Aeroelastic Couplings on Coupled Rotor/Body Dynamics," Proceedings of the Sixth International Workshop on Dynamics and Aeroelastic Stability Modeling of Rotorcraft Systems, Los Angeles, 1995.
9. Ormiston, R. A., "The Challenge of the Damperless Rotor," Proceedings of the Twenty-Second European Rotorcraft Forum, Brighton, England, UK, 1996.
10. Gandhi, F., and Hathaway, E., "Optimized Aeroelastic Couplings for Alleviation of Helicopter Ground Resonance," Journal of Aircraft, Vol. 35, No. 4, 1998, pp. 582-590.
11. Hathaway, E., and Gandhi, F., "Concurrent Optimization of Aeroelastic Couplings and Rotor Stiffness for Alleviation of Helicopter Aeromechanical Instability," Proceedings of the Fifty-Fifth Annual Forum of the American Helicopter Society, American Helicopter Society, Alexandria, VA, 1999, pp. 2212-2223.
12. 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.
13. 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.
14. Straub, F. K., "Optimal Control of Helicopter Aeromechanical Stability," Vertica, Vol. 11, No. 3, 1987, pp. 425-435.
15. Takahashi, M. D., and Friedmann, P. P., "Helicopter Air Resonance Modeling and Suppression Using Active Control," Journal of Guidance and Control, Vol. 14, No. 6, 1991, pp. 1294-1300.
16. 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.
17. Gandhi, F., and Weller, W. H., "Active Aeromechanical Stability Augmentation Using Fuselage State Feedback," Proceedings of the Fifty-Third Annual Forum of the American Helicopter Society, American Helicopter Society, Alexandria, VA, 1997, pp. 1350-1362.
18. Hathaway, E., and Gandhi, F., "Individual Blade Control for Alleviation of Helicopter Ground Resonance," Proceedings of the AIAA/ASME/ASCE/ AHS/ASC 39th Structures, Structural Dynamics, and Materials Conference, AIAA, Reston, VA, 1998, pp. 2507-2517.
19. Hammond, C. E., "An Application of Floquet Theory to Prediction of Mechanical Instability," Journal of the American Helicopter Society, Vol. 19, No. 4, 1974, pp. 14-23.
20. Weller, W. H., and Peterson, R. L., "Measured and Calculated Inplane Stability Characteristics for an Advanced Bearingless Main Rotor," Journal of the American Helicopter Society, Vol. 29, No. 3, 1984, pp. 45-53.
21. McNulty, M. J., "Effects of Blade-to-Blade Dissimilarities on Rotor-Body Lead-Lag Dynamics," Journal of the American Helicopter Society, Vol. 33, No. 1, 1988, pp. 17-28.
22. Wang, J., and Chopra, I., "Dynamics of Helicopters with Dissimilar Blades," Proceedings of the Forty-Seventh Annual Forum of the American Helicopter Society, American Helicopter Society, Alexandria, VA, 1991, pp. 1399-1412.
23. Wang, J., and Chopra, I., "Dynamics of Helicopters with Dissimilar Blades in Forward Flight," Proceedings of the Seventeenth European Rotorcraft Forum, Berlin, 1991.
24. Wang, J., and Chopra, I., "Dynamics of Helicopters in Ground Resonance with and Without Blade Dissimilarities," Proceedings of the AIAA/AHS Dynamics Specialists Conference, AIAA, Washington, DC, 1992; also AIAA Paper 92-2108, April 1992.
25. Ganguli, R., Chopra, I., and Haas, D., "Formulation of a Helicopter Rotor System Damage Detection Methodology," Journal of the American Helicopter Society, Vol. 41, No. 4, 1996, pp. 302-312.
26. Marathe, S., Gandhi, P., and Wang, K. W., "Helicopter Blade Response and Aeromechanical Stability with a Magnetoiheological Fluid Based Lag Damper," Journal of Intelligent Material Systems and Structures, Vol. 9, No. 4, 1998, pp. 272-282.