Acoustic directivity of maneuvering helicopters using wave tracing concepts

Annual Forum Proceedings - American Helicopter Society

Volumn 2, Issue , 2004, Pages 1910-1927

  Ananthan, Shreyas ^a   Leishman, J Gordon ^a  

^a UNIVERSITY OF MARYLAND   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

CARTESIAN COORDINATE SYSTEMS; LIFT COEFFICIENT; MACH NUMBER; POSITION VECTORS;

COMPUTER SIMULATION; DENSITY (SPECIFIC GRAVITY); LIFT; MANEUVERABILITY; POSITION CONTROL; VECTORS; VORTEX FLOW; WAKES;

HELICOPTER ROTORS;

EID: 4143150624     PISSN: 07334249     EISSN: None     Source Type: Conference Proceeding    
DOI: None     Document Type: Conference Paper

References (24)

1. th AIAA/CEAS Aeroacoustics Conference, Lahaina, Hawaii, June 12-14, 2000.
2. th Annual Forum of the American Helicopter Society International, Phoenix, AZ, May 6-8, 2003.
3. th Annual Forum of the American Helicopter Society International, Pheonix, AZ, May 6-9, 2003.
4. th Annual Forum of the American Helicopter Society International, Baltimore, MD, June 7-10, 2004.
5. th Decennial Specialist's Conference on Aeromechanics, San Francisco, CA, Jan 21-23, 2004.
6. th Annual National Forum, Montréal, Cananda, June 11-13, 2002.
7. th Annual Forum of the American Helicopter Society International, Montréal Canada, June 11-13, 2002.
8. Bhagwat, M. J., and Leishman, J. G., "Stability, Consistency and Convergence of Time-Marching Free-Vortex Rotor Wake Algorithms," Journal of the American Helicopter Society, Vol. 46, No. 1, Jan. 2001, pp. 59-71.
9. Leishman, J. G., Bhagwat, M. J., and Bagai, A., "Free-Vortex Filament Methods for the Analysis of Helicopter Rotor Wakes," Journal of Aircraft, Vol. 39, No. 5, Sept-Oct. 2002, pp. 759-775.
10. Bagai, A., Leishman, J. G., and Park, J., "Aerodynamic Analysis of a Helicopter in Steady Maneuvering Flight Using a Free-Vortex Rotor Wake Model," Journal of the American Helicopter Society, Vol. 44, No. 2, April 1999, pp. 109-120.
11. Brentner, K. S., and Farassat, F., "Analytical Comparison of the Acoustic Analogy and Kirchoff Formulation for Moving Surfaces," AIAA Journal, Vol. 36, No. 8, 1998, pp. 1379-1386.
12. Brentner, K., and Farassat, F., "Modeling Aerodynamically Generated Sound of Helicopter Rotors," Progress in Aerospace Sciences, Vol. 39, No. 2-3, Feb-Apr. 2004, pp. 83-120.
13. nd AIAA/CEAS Aeroacoustics Meeting, 1996.
14. Leishman, J. G., "Sound Directivity Generated By Helicopter Rotors Using Wave Tracing Concepts," Journal of Sound and Vibration, Vol. 221, No. 3, 1999, pp. 415-441.
15. Saffman, P. G., Vortex Dynamics, Cambridge University Press, Cambridge, UK, 1992.
16. Bhagwat, M. J., and Leishman, J. G., "Stability Analysis of Helicopter Rotor Wakes in Axial Flight," Journal of the American Helicopter Society, Vol. 45, No. 3, 2000, pp. 165-178.
17. th Annual Forum, Montréal, Canada, June 11-13, 2002.
18. Johnson, W., Helicopter Theory, Princeton University Press, 1980.
19. nd Annual Forum, Washington, DC, June 4-6, 1996.
20. Leishman, J. G., "Subsonic Unsteady Aerodynamics Caused by Gusts Using the Indicial Method," Journal of Aircraft, Vol. 33, No. 5, Sept-Oct. 1996, pp. 869-879.
21. Bagai, A., and Leishman, J. G., "Adaptive Grid Sequencing and Interpolation Schemes for Rotor Free-Wake Analyses," AIAA Journal, Vol. 36, No. 9, Sept. 1998, pp. 1593-1602.
22. th European Rotorcraft Forum, Friedrichshafen, Germany, Sept. 16-18, 2003.
23. th European Rotorcraft Forum, Friedrichshafen, Germany, Sept. 16-18, 2003.
24. Kufeld, R. M., Cross, J. L., and Bousman, W. G., "A Survey of Rotor Loads Distribution in Maneuvering Flight," American Helicopter Society Aeromechanics Specialists Conference, San Francisco, CA, Jan. 19-21, 1994.