Reduced in-plane, low-frequency noise of an active flap rotor

Journal of the American Helicopter Society

Volumn 59, Issue 2, 2014, Pages

  Sim, Ben W ^a   JanakiRam, Ram D ^b   Lau, Benton H ^c  

^a US Army AMRDEC Development   (United States)

^b BOEING COMPANY   (United States)

^c NASA AMES RESEARCH CENTER   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

AEROSPACE ENGINEERING; HELICOPTERS;

ACOUSTIC PULSE; ADVANCING SIDE; FLIGHT CONDITIONS; LOW-FREQUENCY NOISE; NEAR-FIELD ACOUSTICS; NEGATIVE PRESSURES; OPERATING STATE; THICKNESS NOISE;

ACOUSTIC NOISE;

EID: 84901294278     PISSN: 00028711     EISSN: None     Source Type: Journal    
DOI: 10.4050/JAHS.59.022002     Document Type: Conference Paper

References (20)

1. Crawford, C., Jr., "Noise Requirements from a Military Point of View," NASA CP-2052, May 1978, pp. 33-44.
2. Sim, B. W., "Suppressing In-Plane, Low Frequency Helicopter Harmonic Noise with Active Controls," American Helicopter Society Aeromechanics Specialist's Meeting Proceedings, San Francisco, CA, January 23-25, 2008.
3. Yu, Y., Tung, C., van derWall, B., Pausder, H.-J., Burley, C., Brooks, T., Beaumier, P., Delrieux, Y., Mercker, E., and Pengel, K., "The HARTII Test: Rotor Wakes and Aeroacoustics with Higher-Harmonic Pitch Control (HHC) Inputs-The Joint German/French/Dutch/U.S. Project," American Helicopter Society 58thAnnual Forum Proceedings, Montreal, Canada, June 11-13, 2002.
4. Jacklin, S. A., Blaas, A., Teves, D., and Kube, R., "Reduction of Helicopter BVI Noise, Vibration and Power Consumption through Individual Blade Control," American Helicopter Society 51st Annual Forum Proceedings, Fort Worth, TX, May 9-11, 1995.
5. Marcolini, M. A., Booth, E. R., Tadghighi, H., Hassan, A. A., Smith, C. D., and Becker, L. E., "Control of BVI NoiseUsing an Active Trailing-Edge Flap," American Helicopter Society Vertical Lift Aircraft Design Conference Proceedings, San Francisco, CA, January 18-20, 1995.
6. Booth, E. R., Jr., and Wilbur, M. L., "Acoustic Aspects of Active Twist Rotor Control," Journal of the American Helicopter Society, Vol. 49, (1), January 2004, pp. 3-10.
7. Gopalan, G., and Schmitz, F. H., "Far-Field Near In-Plane Harmonic Main Rotor Helicopter Impulsive Noise Reduction Possibilities," American Helicopter Society 64thAnnual Forum Proceedings, Montreal, Canada, April 29-May 1, 2008.
8. Straub, F. K., Anand, V. R., Birchette, T., and Lau, B. H., "Wind Tunnel Test of the SMART Active Flap Rotor," American Helicopter Society 65th Annual Forum Proceedings, Grapevine, TX, May 27-29, 2009.
9. Schmitz, F. H., "Rotor Noise," Aeroacoustics of Flight Vehicles, Theory and Practice, Vol. 1: Noise Sources, edited by Hubbard, H. H., Vol. 1, Acoustical Society of America, Woodbury, NY, 1994, Chap. 2, pp. 65-149.
10. Deming, A. F., "Noise from Propellers with Symmetrical Sections at Zero Blade Angle, II," NACA TN 679, December 1938.
11. Gutin L., "On the Sound Field of a Rotating Propeller," NACA TM 1195, October 1948.
12. Farassat, F., and Succi, G. P., "The Prediction of Helicopter Rotor Discrete Frequency Noise," Vertica, Vol. 7, (4), 1983, pp. 309-320.
13. Jacklin, S. A., Lau, B. H., Nguyen, K. Q., Smith, R. L., and McNulty, "Full-Scale Wind Tunnel Test of the McDonnell Douglas Five-BladedAdvanced BearinglessRotor: Performance, Stability, Loads, Control Power, Vibration and HHC Data," American Helicopter Society Aeromechanics Specialists Conference, San Francisco, CA, January 19-21, 1994.
14. Schmitz, F. H., Allmen, J. R., and Soderman, P. T., "Modification of the Ames 40- by 80-Foot Wind Tunnel for Component Acoustic Testing for the Second Generation Supersonic Transport," NASA TM 108850, October 1994.
15. Soderman, P. T., Jaeger, S.M., Hayes, J.A., and Allen, C. S., "Acoustic Quality of the 40- by 80-Foot Wind Tunnel Test Section after Installation of a Deep Acoustic Lining," NASA TP 2002-211851, November 2002.
16. Allen, C. S., Jaeger, S. M., and Soderman, P. T., "Background Noise Sources and Levels in the NASA Ames 40- by 80-Foot Wind Tunnel at the Turn of the Century: A Status Report," NASA TP 2003-212259, November 2003.
17. Johnson, W. R., "Rotorcraft Aerodynamics Models for a Comprehensive Analysis," American Helicopter Society 54th Annual Forum Proceedings, Washington, DC, May 20-22, 1998.
18. Kottapalli, S., and Straub, F. K., "Correlation of SMART Active Flap Rotor Loads," American Helicopter Society 65th Annual Forum Proceedings, Grapevine, TX, May 27-29, 2009.
19. Shirey, J. S., Brentner, K. S., and Chen, H.-N., "A Validation Study of the PSU-WOPWOP Rotor Noise Prediction System," 45th AIAA Aerospace Sciences Meeting and Exhibit Proceedings, Reno, NV, January 8-11, 2007.
20. Mueller, A. W., Smith, C. D., and LeMasurier, P., "Improvement of the Predicted Aural Detection Code ICHIN (I Can Hear It Now)," Noise-Con 93 Proceedings, May 2-5, 1991, pp. 403-408.