Helicopter Noise due to Blade-Vortex Interaction

• Sheila Widnall

  Department of Aeronautics and Astronautics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139

抄録

The generation of impulsive sound, commonly called blade slap, due to blade-vortex interaction for helicopter rotors is discussed. The unsteady lift on the blades is calculated using linear unsteady aerodynamic theory for an oblique gust model of the blade-vortex interaction. A theoretical model for the radiated sound due to the transient lift fluctuations is presented. Expressions for the directivity, frequency spectrum, transient signal, and total power of the acoustic signal are derived. Typical results are presented and discussed. Calculations of the transient signal are presented in comparison with recent experimental results. The agreement is very good.

収録刊行物

• The Journal of the Acoustical Society of America

  The Journal of the Acoustical Society of America 50 (1B), 354-365, 1971-07-01

  Acoustical Society of America (ASA)

キーワード

• Acoustics and Ultrasonics
• Arts and Humanities (miscellaneous)

詳細情報

• CRID: 1362825894864617728
• NII論文ID: 30016072133
• DOI: 10.1121/1.1912640
• ISSN: 15208524
• ISSN: 00014966
• Web Site: https://pubs.aip.org/asa/jasa/article-pdf/50/1B/354/18771776/354_1_online.pdf
• データソース種別:
  • Crossref
  • CiNii Articles