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The Physics behind BVI Noise Reduction in Descent Flight through the Use of Dynamic Active Twist Control

Hoffmann, Frauke and van der Wall, Berend G. and Yin, Jianping (2018) The Physics behind BVI Noise Reduction in Descent Flight through the Use of Dynamic Active Twist Control. 74th Annual Forum of the American Helicopter Society, 14.-17. Mai 2018, Phoenix, Arizona, USA.

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Abstract

The paper investigates the influence of a dynamic active twist control on BVI noise in descent flight for a Mach-scaled Bo 105 model rotor. Therefore, a numerical study has been carried out with DLR`s aeromechanics rotor code S4. In addition, sound pressure levels have been computed with DLR`s acoustic code APSIM. The intensity of BVI noise is determined by different vortex parameters as well as the blade-vortex miss-distance and the BVI location. In this paper, all parameters that influence the intensity of the radiated BVI noise are analyzed. The analysis is carried out for a rotor shaft angle of attack of 4° for which the most intensive BVI noise was identified for the passive rotor blade. The study lays emphasis on the effect of different control amplitudes and phases but concentrates on a control frequency of the third multiple of the rotor rotational frequency for which highest reductions in BVI noise were identified.

Item URL in elib:https://elib.dlr.de/121470/
Document Type:Conference or Workshop Item (Speech)
Title:The Physics behind BVI Noise Reduction in Descent Flight through the Use of Dynamic Active Twist Control
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Hoffmann, Fraukefrauke.hoffmann (at) dlr.deUNSPECIFIED
van der Wall, Berend G.Berend.VanDerWall (at) dlr.dehttps://orcid.org/0000-0001-6144-0921
Yin, JianpingJianping.Yin (at) dlr.deUNSPECIFIED
Date:May 2018
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:active rotor control, active twist, BVI-noise, noise reduction
Event Title:74th Annual Forum of the American Helicopter Society
Event Location:Phoenix, Arizona, USA
Event Type:international Conference
Event Dates:14.-17. Mai 2018
Organizer:American Helicopter Society
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:rotorcraft
DLR - Research area:Aeronautics
DLR - Program:L RR - Rotorcraft Research
DLR - Research theme (Project):L - The Innovative Rotorcraft
Location: Braunschweig
Institutes and Institutions:Institute of Flight Systems > Rotorcraft
Institute for Aerodynamics and Flow Technology
Deposited By: Hoffmann, Frauke
Deposited On:04 Sep 2018 15:28
Last Modified:01 Dec 2018 19:53

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