Radiation and Directionality Characteristics of Advancing Side Blade-vortex Interaction (BVI) Noise PDF Download
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Author: Fredric H. Schmitz
Publisher:
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Category :
Languages : en
Pages :
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Author: Fredric H. Schmitz
Publisher:
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Category :
Languages : en
Pages :
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Author: Todd Darwin Ringler
Publisher:
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Category :
Languages : en
Pages : 332
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Author: Juan Abelló
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Category :
Languages : en
Pages : 466
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Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781723489051
Category :
Languages : en
Pages : 24
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An acoustics test of a 40%-scale MBB BO-105 helicopter main rotor was conducted in the Deutsch-Niederlandischer Windkanal (DNW). The research, directed by NASA Langley Research Center, concentrated on the generation and radiation of broadband noise and impulsive blade-vortex interaction (BVI) noise over ranges of pertinent rotor operational envelopes. Both the broadband and BVI experimental phases are reviewed, along with highlights of major technical results. For the broadband portion, significant advancement is the demonstration of the accuracy of prediction methods being developed for broadband self noise, due to boundary layer turbulence. Another key result is the discovery of rotor blade-wake interaction (BWI) as an important contributor to mid frequency noise. Also the DNW data are used to determine for full scale helicopters the relative importance of the different discrete and broadband noise sources. For the BVI test portion, a comprehensive data base documents the BVI impulsive noise character and directionality as functions of rotor flight conditions. The directional mapping of BVI noise emitted from the advancing side as well as the retreating side of the rotor constitutes a major advancement in the understanding of this dominant discrete mechanism. Brooks, Thomas F. and Martin, Ruth M. Langley Research Center NASA-TM-100507, NAS 1.15:100507 RTOP 505-63-51-06
Author: United States. National Aeronautics and Space Administration
Publisher:
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Category : Aeronautics
Languages : en
Pages : 256
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Author: Ruth McVoy Martin
Publisher:
ISBN:
Category : Rotors (Helicopters)
Languages : en
Pages : 32
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Author:
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ISBN:
Category : Astronautics
Languages : en
Pages : 316
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Author:
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ISBN:
Category : Acoustical engineering
Languages : en
Pages : 48
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Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 486
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Author: Ruth McVoy Martin
Publisher:
ISBN:
Category : Acoustical engineering
Languages : en
Pages : 48
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