Suppressing in-plane, low frequency helicopter harmonic noise with active controls

AHS Specialists Conference on Aerodynamics 2008

Volumn 1, Issue , 2008, Pages 229-247

  Sim, Ben W ^a  

^a NASA AMES RESEARCH CENTER   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

ACTIVE CONTROL; ADVANCING SIDE; AERODYNAMIC FORCES; ANTINOISE; CONTROL DEVICE; FREQUENCY HARMONICS; HARMONIC NOISE; IN-PLANE FORCE; LOWER FREQUENCIES; PULSEWIDTHS;

NOISE ABATEMENT;

EID: 58149487742     PISSN: None     EISSN: None     Source Type: Conference Proceeding    
DOI: None     Document Type: Conference Paper

References (16)

1. Deming, A. F., "Noise from Propellers with Symmetrical Sections at Zero Blade Angle, II., NACA TN-679, December 1938.
2. Gutin L, "On the Sound Field of a Rotating Propeller," NACATM-1195, October 1948.
3. Schmitz, F.H., "Rotor Noise," Chapter 2 in book authored by Hubbard, H. H., Aeroacoustics of Flight Vehicles. Theory and Practice. Vol. 1: Noise Sources, Published for the Acoustical Society of America through the American Institute of Physics, 1995.
4. Schmitz, F. H. and Yu, Y. H., "Helicopter Impulsive Noise: Theoretical and Experimental Status," NASA TP-84390, November 1983.
5. Crawford, C. Jr., "Noise Requirements from A Military Point of View," NASA CP-2052, May 1978, pp. 33-44.
6. Shahady, P. A., et. al., "The Effects of Modulated Blade Spacing on Static Rotor Acoustics and Performance," AIAA-1973-1020, Presented at AIAA Aeroacoustics Conference, Seattle, WA, October 15-17, 1973.
7. th Annual Forum, Montreal, Canada, June 11-13, 2002.
8. st Annual Forum, May 1995.
9. Booth, E. R. Jr. and Wilbur, M. L, "Acoustic Aspects of Active-Twist Rotor Control," Presented at the AHS 58th Annual Forum, Montreal, Canada, June 11-13, 2002.
10. Marcolini, M, A et. al., "Control of BVI Noise Using an Active Trailing-Edge Flap," Presented at the 1999 AHS Vertical Lift Aircraft Design Conference, San Francisco, CA.
11. Schmitz, F. H. and Gopalan, G., "High-Speed Impulsive Helicopter Noise Reduction Possibilities Through On-Blade Acoustic Control," Presented at the 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.
12. Schmitz, Y. H., Aggarwal, H. R. and Boxwell, D. A., "Prediction Measurement of a Low-Frequency Harmonic Noise of Hovering Model Helicopter Rotor," J. Aircraft, Vol. 37, No. 5, September-October 2000, pp. 786-795.
13. Farassat, F. and Succi, G. P., "The Prediction of Helicopter Rotor Discrete Frequency Noise," Vertica, Vol. 7, No. 4, pp. 309-320, 1983.
14. rd Annual AHS Forum, Virginia Beach, VA, May 1-3, 2007.
15. Johnson, W. R., "Rotorcraft Aerodynamics Models for a Comprehensive Analysis," Presented at the American Helicopter Society Forum, Washington, D.C., May 1998.
16. Shirey, J. S., Brentner, K. S., Chen, H.-N., "A Validation Study of the PSU-WOPWOP Rotor Noise Prediction System," Presented at the 45th AIAA Aerospace Sciences Meeting and Exhibit, Reno, Nevada, January 8-11, 2007.