Understanding far field near-in-plane high speed harmonic helicopter rotor noise in hover: Governing parameters and active acoustic control possibilities

AHS Specialists Conference on Aerodynamics 2008

Volumn 1, Issue , 2008, Pages 248-270

  Gopalan, Gaurav ^a   Schmitz, Fredric H ^a  

^a UNIVERSITY OF MARYLAND   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

ASPECT RATIO; HARMONIC ANALYSIS; HELICOPTER ROTORS;

ANALYTICAL APPROACH; DESIGN PARAMETERS; FAR-FIELD; GOVERNING PARAMETERS; HARMONIC NOISE; HIGH SPEED; OPERATIONAL PARAMETERS; PEAK-TO-PEAK; ROTOR NOISE; THICKNESS NOISE;

CONTROLLERS;

EID: 58149517821     PISSN: None     EISSN: None     Source Type: Conference Proceeding    
DOI: None     Document Type: Conference Paper

References (7)

1. Schmitz, F.H., "Rotor Noise," Aeroacoustics of Flight Vehicles, Theory and Practice, Vol. 1: Noise Sources, (book authored by Hubbard, H. H.), Published for the Acoustical Society of America through the American Institute of Physics, Chapter 2, 1995.
2. Ffowcs Williams, J. E. and Hawkings, D. L., "Sound Generation by Turbulence and Surfaces in Arbiturary Motion", Philosophical Transactions of the Royal Society of London, A264, pp. 321-342, 1969.
3. Schmitz, F. H. and Gopalan, G. "High-Speed Impulsive Helicopter Noise Reduction Possibilities Through On-Blade Control", Invited for presentation at International Forum on Rotorcraft Multidisciplinary Technology Organized by AHS International and the Korean Society for Aeronautical and Space Sciences, Seoul, Korea, October 15-17, 2007.
4. Farassat, F. and Succi, G. P., "The Prediction of Helicopter Discrete Frequency Noise", Vertica Vol. 7 No. 4, pp 309-320, 1983.
5. Brentner, K. S. and Farassat, F., "Modeling Aerodynamically Generated Sound for Helicopter Rotors", Progress in Aerospace Sciences, Vol. 39, pp. 83-120, 2003.
6. Schmitz, F. H. and Yu, Y. H., "Helicopter Impulsive Noise: Theoretical and Experimental Status", Journal of Sound and Vibration, Vol. 109, No. 3, pp. 361-422, 1986.
7. Schmitz, F. H. and Yu, Y. H., 'Theoretical Modeling of High Speed Helicopter Noise", Journal of the American Helicopter Society, Vol. 24, p. 10-19, 1979.