Analytic extraction of the elastic coupling mechanisms in composite blades

Composite Structures

Volumn 49, Issue 4, 2000, Pages 399-413

  Alkahe, Jonathan ^a   Rand, Omri ^a  

^a TECHNION ISRAEL INSTITUTE OF TECHNOLOGY   (Israel)

Author keywords

Aeroelastic stability; Composite beams; Composite blades; Elastic couplings; Hingeless blades

Indexed keywords

AERODYNAMICS; BENDING (DEFORMATION); DYNAMIC RESPONSE; ELASTICITY; FREQUENCY DOMAIN ANALYSIS; HELICOPTER ROTORS; LAMINATED COMPOSITES; MATHEMATICAL MODELS; STRUCTURAL ANALYSIS; VIBRATIONS (MECHANICAL);

ELASTIC COUPLING MECHANISMS; HELICOPTER ROTOR BLADES;

COMPOSITE STRUCTURES;

EID: 0033732863     PISSN: 02638223     EISSN: None     Source Type: Journal    
DOI: 10.1016/S0263-8223(00)00074-X     Document Type: Article

References (29)

1. Chopra I. Perspectives in aeromechanical stability of helicopter rotors. In: American Helicopter Society National Specialists' Meeting on Rotorcraft Dynamics. Arlington, Texas, 13-14 November 1989.
2. Smith EC, Chopra I. Aeromechanical stability of helicopters with composite rotor blades in forward flight. In: 48th Annual Forum of the American Helicopter Society. Washington, DC, 3-5 June 1992, p. 57-73.
3. Gaonkar G.T., McNulty M.J., Nagabhushanam J. An experimental and analytical investigation of isolated rotor flap-lag stability in forward flight. J Amer Helicopter Soc. 35(2):1990;25-34.
4. Maier TH, Sharpe DL, Lim JM. Fundamental investigation of hingeless rotor aeroelastic stability, test data and correlation. In: 51st Annual Forum of the American Helicopter Society. Fort Worth, Texas, 9-11 May 1995.
5. Friedmann P.P. Helicopter vibration reduction using strutural optimization with aeroelastic/multidisciplinary constraints - a survey. J Aircraft. 28(1):1991;8-21.
6. Callahan C.B., Straub F.K. Design optimization of rotor blades for improved performance and vibration. J Amer Helicopter Soc. 38(4):1993;62-70.
7. Chattopadhyay A., McCarthy T.R., Madden III J.F. An optimization procedure for the design of prop-rotors in high speed cruise including the coupling of performance, aeroelastic stability and structures. Math Comput Modelling. 19(3/4):1994;75-88.
8. Banerjee J.R., Guo S., Homson W.P. Exact dynamic stiffness matrix of a bending-torsion coupled beam including warping. Comput Struct. 4:1996;613-621.
9. Rand O, Barkai SM. Analytic insight into the structural couplings and nonlinear formulation of solid and thin-walled composite blades. In: 52nd Annual Forum of the American Helicopter Society. Washington, DC, 4-6 June 1996.
10. Rand O., Barkai S.M. A refined nonlinear analysis of pre-twisted composite blades. J Comp Struct. 39(1-2):1997;39-54.
11. Rand O. Similarities between solid and thin-walled composite beams by analytic approach. J Aircraft. 35(4):1998;604-615.
12. Smith E.C., Chopra I. Air and ground resonance of helicopters with elastically tailored composite rotor. J Amer Helicopter Soc. 38(4):1993;50-61.
13. Yamane T., Friedmann P.P. Aeroelastic tailoring analysis for preliminary design of advanced propellers with composite Blades. J Aircraft. 30(1):1993;119-126.
14. Tracy A.L., Chopra I. Aeroelastic analysis of a composite bearingless rotor in forward flight using an improved warping model. J Amer Helicopter Soc. 40(3):1995;80-91.
15. Dancila DS, Armanios EA. The influence of coupling on the free vibration of anisotropic thin-walled closed-section beams. In: 36th AIAA/ASME/ASCE/AHS Structures, Structural Dynamics and Materials Conference, AIAA Paper 95-1411-CP. 1995, p. 2106-15.
16. Nitzsche F. Active and passive control of the aeroelastic response of helicopter rotors using smart materials to tailor the blade root flexibility. In: SPIE Conference on Smart Structures and Integreted Systems, San Diego, CA. 27 February-3 March 1995, p. 20-7.
17. Kamath GM, Wereley NM. Development of ER-fluid based actuators for rotorcraft flexbeam applications. In: SPIE Conference on Smart Structures and Integreted Systems, San Diego, CA. 27 February 27-3 March 1995, p. 120-33.
18. Bernhard APF, Chopra I. Development of a smart moving blade tip activated by a piezo-induced bending-torsion coupled beam. In: SPIE Conference on Smart Structures and Integreted Systems, San Diego, CA. 26-29 February 1996, p. 63-79.
19. Bauchau O.A., Chiang W. Dynamic analysis of rotor flexbeams based on nonlinear anisotropic shell models. J Amer Helicopter Soc. 38(1):1993;55-61.
20. Sen J.K. The influence of a tension load on laminates under torsion. J Amer Helicopter Soc. 40(4):1995;71-78.
21. Ghandhi F., Chopra I. An analytical model for a nonlinear elastomeric lag damper and its effect on aeromechanical stability in Hover. J Amer Helicopter Soc. 39(4):1994;59-69.
22. Smith E.C., Govindswamy K., Beale M.R., Vascsinec M., Lesieutre G.A. Aeroelastic response and stability of helicopters with elastomeric lag dampers. J Amer Helicopter Soc. 41(3):1996;257-266.
23. Rand O. Nonlinear analysis of orthotropic beams of solid cross-sections. J Comp Struct. 29(1):1994;27-45.
24. Rand O. Fundamental closed-form solutions for solid and thin-walled composite beams including a complete out-of-plane warping model. Int J Solid Struct. 35(21):1998;2775-2793.
25. Bull JW, editors. Numerical analysis and modelling of composite materials, Chapter 1: Analysis of composite rotor blades. London: Chapman & Hall, 1995.
26. Weller W.H. Variation in Hover aeromechanical stability trends with bearingless main rotor design. J Amer Helicopter Soc. 39(1):1994;70-80.
27. Rosen A., Rand O. Numerical model of the nonlinear behavior of curved rods. Comput Struct. 22(5):1986;785-799.
28. Ochoa O.O., Reddy J.N. Finite element analysis of composite laminates. 1992;Kluwer Academic Publisher, Netherlands.
29. Alkahe J. Improving the structural dynamics of helicopter blades by elastic couplings. Research Thesis, Technion - I.I.T., Israel: Haifa, March 1998.