Influence of nonlinear elastomer on isolated lag dynamics and rotor/fuselage aeromechanical stability

Journal of Aircraft

Volumn 41, Issue 6, 2004, Pages 1449-1464

  Pohit, G ^a,b,c   Venkatesan, C ^a,b   Mallik, A K ^a,b  

^a INDIAN INSTITUTE OF TECHNOLOGY KANPUR   (India)

^b Department of Mechanical Engineering ^*

^c JADAVPUR UNIVERSITY   (India)

Author keywords

[No Author keywords available]

Indexed keywords

AERODYNAMICS; BEARINGS (MACHINE PARTS); DAMPING; EIGENVALUES AND EIGENFUNCTIONS; FUSELAGES; NATURAL FREQUENCIES; NONLINEAR EQUATIONS; PERTURBATION TECHNIQUES; ROTORS; STABILITY; TORQUE;

AEROMECHANICAL STABILITY; EXCITATION FREQUENCY; ISOLATED LAG DYNAMICS; NONDIMENSIONAL STIFFNESS;

ELASTOMERS;

EID: 10944269193     PISSN: 00218669     EISSN: 15333868     Source Type: Journal    
DOI: 10.2514/1.9438     Document Type: Article

References (29)

1. Hodges, D. H., "A Theoretical Technique for Analyzing Aeroelastic Stability of Bearingless Rotors," AIAA Journal, Vol. 17, No. 4, 1978, pp. 400-407.
2. Hodges, D. H., "An Aeromechanical Stability Analysis for Bearingless Rotor Helicopters," Journal of the American Helicopter Society, Vol. 24, No. 1, 1979, pp. 2-9.
3. Sivaneri, N. T., and Chopra, I., "Finite Element Analysis for Bearingless Rotor Blade Aeroe-Lasticity," Journal of the American Helicopter Society, Vol. 29, No. 2, 1984, pp. 42-51.
4. Dull, A. L., and Chopra, I., "Aeroelastic Stability of Bearingless Rotors in Forward Flight," Journal of the American Helicopter Society, Vol. 33, No. 4, 1988, pp. 38-46.
5. Jang, J., and Chopra, I., "Ground and Air Resonance of an Advanced Bearingless Rotor in Hover," Journal of the American Helicopter Society, Vol. 33, No. 3, 1988, pp. 20-29.
6. Gandhi, F., and Chopra, I., "An Analytical Model for a Nonlinear Elastomeric Lag Damper and Its Effect on Aeromechanical Stability in Hover," Journal of the American Helicopter Society, Vol. 39, No. 4, 1994, pp. 59-69.
7. Gandhi, F., and Chopra, I., "Analysis of Bearingless Main Rotor Dynamics with the Inclusion of an Improved Time Domain Nonlinear Elastomeric Damper Model," Journal of the American Helicopter Society, Vol. 41, No. 3, 1996, pp. 267-277.
8. Panda, B., and Mychalowycz, E., "Aeroelastic Stability Wind Tunnel Testing with Analytical Correlation of the Comanche Bearingless Main Rotor," Journal of the American Helicopter Society, Vol. 42, No. 3, 1997, pp. 207-217.
9. Ormiston, R. A., Saberi, H., and Anastassiades, T., "Application of 2GCHAS to the Investigation of Aeromechanical Stability of Hingeless Rotor Helicopters," Proceedings of the 51st Forum of the American Helicopter Society, American Helicopter Society, Alexandria, VA, 1995, pp. 1132-1155.
10. Mallik, A. K., Kher, V., Puri, M., and Hatwal, H., "On the Modelling of Nonlinear Elastometic Vibration Isolators," Journal of Sound and Vibration, Vol. 219, No. 2, 1999, pp. 239-253.
11. Gobel, E. F., Rubber Springs Design, Newnes-Butterworths, London, 1974, Chap. 1.
12. Wereley, N. M., Snyder, R., Krishnan, R., and Sieg, T., "Helicopter Damping," Encyclopedia of Vibration, edited by D. Ewins and S. S. Rao, Academic Press, New York, 2001, pp. 629-642.
13. McGuire, D. P., "The Application of Elastomeric Lead-lag Dampers to Helicopter Rotors," Lord Library, Technical Papers No. LL2133, Erie, PA, 1976.
14. Hausmann, G., "Structural Analysis and Design Considerations of Elastomeric Dampers with Viscoelastic Material Behavior," Twelfth European Rotorcraft Forum, Garmisch-Partekirchen, Germany, Sept. 1986, pp. 70.1-70.26.
15. Felker, F., Lau, B., McLaughlin, S., and Johnson, W.,"Nonlinear Behavior of an Elastomeric Lag Damper Undergoing Dual-frequency Motion and Its Effect on Rotor Dynamics," Journal of the American Helicopter Society, Vol. 34, No. 4, 1987, pp. 45-53.
16. Kunz, D. L.,"Influence of Elastomeric Damper Modeling on the Dynamic Response of Helicopter Rotors," AIAA Journal, Vol. 35, No. 2, 1997, pp. 349-354.
17. Lesieutre, G. A., and Bianchini, E., "Time-Domain Modeling of Linear Visco-Elasticity Using Anelastic Displacement Fields," Journal of Vibration and Accoustics, Vol. 117, No. 4, 1995, pp. 424-430.
18. Smith, E. C., Beale, M. R., Govindswamy, K., Vascsineci, M. J., and Lesieutre, G. A., "Formulation and Validation of a Finite Element Model for Elastomeric Lag Dampers," Proceedings of the 51st Annual Forum of the American Helicopter Society, American Helicopter Society, Alexandria, VA, 1995, pp. 1101-1116.
19. Govindswamy, K., Smith, E. C., and Lesieutre, G. A., "Aero-Thermoelastic Behavior of Helicopter with Elastomeric Lag Dampers," Proceedings of the American Helicopter Society Aeromechanics Specialists' Meeting, American Helicopter Society, Alexandria, VA, 1995, pp. 8.52-8.70.
20. Brackbill, C. R., Lesieutre, G. A., Smith, E. C., and Govindswamy, K., "Thermo Mechanical Modeling of Elastomeric Materials," Journal of Smart Materials and Structures, Vol. 5, No. 5, 1996, pp. 529-539.
21. Byers, L. K., Lesieutre, G. A., Smith, E. C., and Beale, M. R., "Transient Behavior of Elastomeric Damper and Bearing Materials," AIAA Paper 96-1218, April 1996.
22. Ruhl, L. E., Lesieutre, G. A., Brackbill, C. R., and Smith, E. C., " Thermomechanical Modeling of Elastomeric Damper Materials," AIAA Paper 99-1221, April 1999.
23. Brackbill, C. R., Lesieutre, G. A., Ruhl, L. E., and Smith, E. C., "Characterization and Modeling of the Low Strain Amplitude and Frequency Dependent Behavior of Elastomeric Damper Materials," AIAA Paper 98-1845, April 1998.
24. Gandhi, F., and Chopra, I., "A Time Domain Non-Linear Viscoelastic Damper Model," Journal of Smart Materials and Structures, Vol. 5, 1996, pp. 517-528.
25. Potter, J. L., McGuire, D. P., and Brubaker, E. L., "Elastomers + Fluid + Electronics = Improved Comfort and Reliability for Aircraft," Proceedings of the International Exhibition Cum Seminar on Helicopter Development and Utilisation in South Asia-Pacific, Aeronautical Society of India, Bangalore, India, Oct. 1995, pp. 6.3-1-6.3-19.
26. Bagley, R. L., and Torvik, P. J., "A Theoretical Basis for the Application of Fractional Calculus to Viscoelasticity," Journal of Rheology, Vol. 27, No. 3, 1983, pp. 201-210.
27. Pohit, G., Mallik, A. K., and Venkatesan, C., "Free Out-Of-Plane Vibration of a Rotating Beam with Non-Linear Elastomeric Constraints," Journal of Sound and Vibration, Vol. 220, No. 1, 1999, pp. 1-25.
28. Pohit, G., "Dynamics of a Bearingless Helicopter Rotor Blade with a Non-Linear Elastomeric Constraint," Ph.D Dissertation, Dept. of Mechanical Engineering, Indian Inst. of Technology, Kanpur, India, Feb. 1999.
29. Pakdemirli, M., and Nayfeh, A. H., "Nonlinear Vibration of a Beam-Spring-Mass System," Journal of Vibration and Acoustics, Vol. 116, No. 4, 1994, pp. 433-439.