A study of acoustic reflections in full-scale rotor low frequency noise measurements acquired in wind tunnels

AHS Aeromechanics Specialists Conference 2010

Volumn , Issue , 2010, Pages 180-187

  Barbely, Natasha L ^a   Sim, Ben W ^b   Kitaplioglu, Cahit ^b   Goulding II, Pat ^b  

^a Georgia Institute of Technology   (United States)

^b NASA AMES RESEARCH CENTER   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

ACOUSTIC REFLECTION; LOW-FREQUENCY NOISE MEASUREMENTS; MEASUREMENT QUALITY; METHOD OF IMAGES; NOISE MEASUREMENTS; NOISE RADIATIONS; REFLECTION ANALYSIS; SOUND REFLECTION; TIME HISTORY; WALL TREATMENT; WIND-TUNNEL FACILITIES;

ACOUSTIC NOISE MEASUREMENT; ARCHITECTURAL ACOUSTICS; LOW PASS FILTERS; REFLECTION; THERMAL NOISE; WIND TUNNELS;

AERODYNAMICS;

EID: 77953523408     PISSN: None     EISSN: None     Source Type: Conference Proceeding    
DOI: None     Document Type: Conference Paper

References (15)

1. Yu, Y. H., Tung, C., van der Wall, B. G., Pausder, H., Burley, C., Brooks, T., Beaumier, P., Delrieux, Y., Mercker, E. and Pengel, K., "The HART II Test: Rotor Wakes and Aeroacoustics with Higher-Harmonic Pitch Control (HHC) Inputs - The Joint German/French/Dutch/US Project", Proceedings of the 58th Annual Forum of the American Helicopter Society, Montreal, Canada, June 11-13, 2002.
2. Jacklin, S. A., Haber A., de Simone G., Norman, T. R., Shinoda P., "Full-Scale Wind Tunnel Test of an Individual Blade Control System for a UH-60 Helicopter", Proceedings of the 58th Annual Forum of the American Helicopter Society, Montreal, Canada, June, 2002.
3. Booth, E. R. Jr. and Wilbur, M. L., "Acoustic Aspects of Active-Twist Rotor Control", Proceedings of the 58th Annual Forum of the American Helicopter Society, Montreal, Canada, June, 2002.
4. Splettstoesser, W. R., Schultz, K. J., van der Wall, B. G., Buchholz, H., Gembler, W. and Niesl, G., "The Effect of Individual Blade Control on BVI Noise- Comparisons of Flight Test and Simulation Results', Proceedings of 24th European Rotorcraft Forum, Marseilles, France, 1998.
5. Straub, F. K., Vaidyanathan, A. R., Birchette, T., and Lau, B. H., "Wind Tunnel Test of the SMART Active Flap Rotor", Proceedings of the 65th Annual Forum of the American Helicopter Society, Grapevine, Texas, May 27-29, 2009.
6. Beranek, L. L., Acoustic Measurements. Published by John Wiley & Sons, Inc., New York, 1950.
7. 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
8. Soderman, P. T., Schmitz, F. H., Allen, C. S., Jaeger, S. M., Sacco, J. N., Mosher, M., and Hayes, J. A., "Design and Development of a Deep Acoustic Lining for the 40- by 80-Foot Wind Tunnel Test Section," NASA/TP-2002-211850.
9. Sim, B. W., JanakiRam, R. D., Barbely, N. L., Solis, E., "Reduced In-Plane Low Frequency Noise of an Active Flap Rotor", Proceedings of the 65th Annual Forum of the American Helicopter Society, Grapevine, Texas, May 27-29, 2009.
10. 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.
11. Watts, M. E., Conner, D. A. and Smith, C. D., "Joint Eglin Acoustic Week III Data Report," NASA TM-2009-XXXX, To be released, 2009
12. Johnson, W. R., "Rotorcraft Aerodynamics Models for a Comprehensive Analysis," Proceedings of the 54th Annual Forum of American Helicopter Society, Washington, D.C., May 1998
13. Shirey, J. S., Brentner, K. S., Chen, H.-N., "A Validation Study of the PSU-WOPWOP Rotor Noise Prediction System," 45th AIAA Aerospace Sciences Meeting and Exhibit, Reno, Nevada, January 8-11, 2007.
14. Gibbs, B. M. and Jones, D. K., "A Simple Image Method for Calculating the Distribution of Sound Pressure Levels within an Enclosure," Acustica, Vol. 26, 1972, pp. 24-32.
15. Allen, J. B. and Berkley, D. A., "Imaged Method for Efficiently Simulating Small-Room Acoustics," J. Acoust. Soc. Am., Vol. 65(4), April, 1979, pp. 943-950.