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The Influence of Static Active Twist Control on BVI Noise in Descent Flight

Hoffmann, Frauke and Yin, Jianping (2016) The Influence of Static Active Twist Control on BVI Noise in Descent Flight. DLRK 2016, 13.-15. Sep. 2016, Braunschweig, Deutschland.

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Abstract

Active twist control uses piezoceramic actuators in order to generate a control input at the blade. These actuators are operated within an asymmetric voltage range. Thus, static control inputs are needed to be able to use the full operational range of the actuators. This paper investigates the influence of static active twist control on vortex parameters which mainly determine the intensity of blade vortex interactions (BVI) and therefore the noise radiated in descent flight. A numerical study is carried out with DLR's aeromechanics rotor simulation code S4. Within the scope of this study, the effect of different static twist inputs on vortex parameters in dependence of the rotor angle of attack is analysed. Variations in BVI noise are then demonstrated for selected static active twist control inputs based on sound pressure levels that have been computed using DLR's acoustic code APSIM. The aim of this study is an understanding of the influence of static active twist control on the driving parameters for BVI noise and an evaluation of the resulting variation in BVI noise itself.

Item URL in elib:https://elib.dlr.de/106260/
Document Type:Conference or Workshop Item (Speech)
Title:The Influence of Static Active Twist Control on BVI Noise in Descent Flight
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Hoffmann, Fraukefrauke.hoffmann (at) dlr.deUNSPECIFIED
Yin, Jianpingjianping.yin (at) dlr.deUNSPECIFIED
Date:September 2016
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:static acticve twist, rotor blade, BVI noise, descent flight
Event Title:DLRK 2016
Event Location:Braunschweig, Deutschland
Event Type:national Conference
Event Dates:13.-15. Sep. 2016
Organizer:DGLR
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
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Deposited By: Hoffmann, Frauke
Deposited On:24 Nov 2016 12:52
Last Modified:07 Aug 2017 12:55

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