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International Journal of Aerospace Engineering
Volume 2015, Article ID 485964, 10 pages
http://dx.doi.org/10.1155/2015/485964
Research Article

Helicopter Vibratory Loads Alleviation through Combined Action of Trailing-Edge Flap and Variable-Stiffness Devices

Department of Engineering, Roma Tre University, Via della Vasca Navale 79, 00146 Rome, Italy

Received 12 March 2015; Accepted 21 May 2015

Academic Editor: R. Ganguli

Copyright © 2015 Massimo Gennaretti et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Linked References

  1. P. Anusonti-Inthra and F. Gandhi, “Helicopter vibration reduction through cyclic variations in rotor blade root stiffness,” Journal of Intelligent Material Systems and Structures, vol. 11, no. 2, pp. 153–166, 2000. View at Publisher · View at Google Scholar · View at Scopus
  2. M. L. Wilbur, P. H. Mirick, W. T. Yeager Jr., C. W. Langston, C. E. S. Cesnik, and S. Shin, “Vibratory loads reduction testing of the NASA/Army/MIT active twist rotor,” Journal of the American Helicopter Society, vol. 47, no. 2, pp. 123–133, 2002. View at Publisher · View at Google Scholar · View at Scopus
  3. D. Patt, L. Liu, J. Chandrasekar, D. S. Bernstein, and P. P. Friedmann, “Higher-harmonic-control algorithm for helicopter vibration reduction revisited,” Journal of Guidance, Control, and Dynamics, vol. 28, no. 5, pp. 918–930, 2005. View at Publisher · View at Google Scholar · View at Scopus
  4. U. T. P. Arnold and D. Fürst, “Closed loop IBC results from CH-53G flight tests,” Aerospace Science and Technology, vol. 9, no. 5, pp. 421–435, 2005. View at Publisher · View at Google Scholar · View at Scopus
  5. F. Nitzsche, D. Feszty, D. Waechter et al., “The SHARCS project: smart hybrid active rotor control system for noise and vibration attenuation of helicopter rotor blades,” in Proceedings of the 31st European Rotorcraft Forum, pp. 1–52, Firenze, Italy, September 2005. View at Scopus
  6. C. Kessler, “Active rotor control for helicopters: individual blade control and swashplateless rotor designs,” CEAS Aeronautical Journal, vol. 1, no. 1–4, pp. 23–54, 2011. View at Publisher · View at Google Scholar
  7. S. R. Viswamurthy and R. Ganguli, “Performance sensitivity of helicopter global and local optimal harmonic vibration controller,” Computers & Mathematics with Applications, vol. 56, no. 10, pp. 2468–2480, 2008. View at Publisher · View at Google Scholar · View at MathSciNet · View at Scopus
  8. K. Ravichandran, I. Chopra, B. E. Wake, and B. Hein, “Trailing-edge flaps for rotor performance enhancement and vibration reduction,” Journal of the American Helicopter Society, vol. 58, no. 2, pp. 1–13, 2013. View at Publisher · View at Google Scholar · View at Scopus
  9. R. Mallick, R. Ganguli, M. S. Bhat, S. R. Viswamurthy, and R. Ganguli, “Robust design of multiple trailing edge flaps for helicopter vibration reduction: a multi-objective bat algorithm approach,” Engineering Optimization, 2014. View at Publisher · View at Google Scholar
  10. M. Gennaretti, M. M. Colella, and G. Bernardini, “Analysis of helicopter vibratory hub loads alleviation by cyclic trailing-edge blade flap actuation,” The Aeronautical Journal, vol. 113, no. 1146, pp. 549–556, 2009. View at Google Scholar · View at Scopus
  11. M. Muller, U. T. P. Arnold, and D. Morbitzer, “On the importance and efficiency of 2/rev IBC for noise, vibration and pitch link load reduction,” in Proceedings of the 25th European Rotorcraft Forum, Rome, Italy, September 1999.
  12. M. H. Chia, A. K. Padthe, and P. P. Friedmann, “A parametric study of on-blade control device performance for Helicopter vibration and noise reduction,” in Proceedings of the 70th Annual Forum of the American Helicopter Society, Montreal, Canada, May 2014.
  13. F. Nitzsche, A. Grewal, and D. Zimcik, “Structural component having means for actively varying its stiffness to control vibrations,” U.S. Patent No. 5,973,440, 999, European Patent EP-996570-B1, 2001.
  14. M. Gennaretti, L. Poloni, and F. Nitzsche, “‘Smart spring’ identification for hovering rotor aeroelastic-stability augmentation,” The Aeronautical Journal, vol. 107, no. 1071, pp. 233–240, 2003. View at Google Scholar · View at Scopus
  15. D. H. Hodges and E. H. Dowell, “Nonlinear equation for the elastic bending and torsion of twisted nonuniform rotor blades,” NASA TN D-7818, 1974. View at Google Scholar
  16. M. Gennaretti and G. Bernardini, “Novel boundary integral formulation for blade-vortex interaction aerodynamics of helicopter rotors,” AIAA Journal, vol. 45, no. 6, pp. 1169–1176, 2007. View at Publisher · View at Google Scholar · View at Scopus
  17. G. Bernardini, J. Serafini, M. Molica Colella, and M. Gennaretti, “Analysis of a structural-aerodynamic fully-coupled formulation for aeroelastic response of rotorcraft,” Aerospace Science and Technology, vol. 29, no. 1, pp. 175–184, 2013. View at Publisher · View at Google Scholar · View at Scopus
  18. T. Theodorsen, “General theory of aerodynamic instability and the mechanism of flutter,” NACA Report 496, 1935. View at Google Scholar
  19. J. M. Greenberg, “Airfoil in sinusoidal motion in a pulsating stream,” NACA TN-1326, 1947. View at Google Scholar
  20. D. H. Hodges and R. A. Ormiston, “Stability of elastic bending and torsion of uniform cantilever rotor blades in hover with variable structural coupling,” NASA TN D-8192, 1976. View at Google Scholar
  21. J. M. Drees, “A theory of airow through rotors and its application to some Helicopter problems,” Journal of the Helicopter Association of Great Britain, vol. 3, no. 2, pp. 79–104, 1949. View at Google Scholar
  22. D. Patt, L. Liu, and P. P. Friedmann, “Rotorcraft vibration reduction and noise prediction using a unified aeroelastic response simulation,” Journal of the American Helicopter Society, vol. 50, no. 1, pp. 95–106, 2005. View at Publisher · View at Google Scholar · View at Scopus
  23. J. Zhang, Active-passive hybrid optimization of rotor blades with trailing edge flaps [Ph.D. thesis], Department of Aerospace Engineering, Pennsylvania State University, State College, Pa, USA, 2001.
  24. W. Johnson, “Self-tuning regulators for multicyclic control of Helicopter vibration,” NASA TP-1996, 1982. View at Google Scholar
  25. S. Modini, G. Graziani, G. Bernardini, and M. Gennaretti, “Parallel blade-vortex interaction modelling for helicopter rotor noise control synthesis,” International Journal of Aeroacoustics, vol. 13, no. 7-8, pp. 587–606, 2014. View at Publisher · View at Google Scholar
  26. M. Molica Colella, G. Bernardini, and M. Gennaretti, “Tiltrotor wing-root vibratory loads reduction through higher harmonic control actuation,” Journal of Aircraft, vol. 49, no. 6, pp. 1813–1820, 2012. View at Publisher · View at Google Scholar · View at Scopus
  27. G. Bernardini, C. Testa, and M. Gennaretti, “Optimal design of tonal noise control inside smart-stiffened cylindrical shells,” Journal of Vibration and Control, vol. 18, no. 8, pp. 1233–1246, 2012. View at Publisher · View at Google Scholar · View at MathSciNet · View at Scopus