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Development of active twist rotors at the German Aerospace Center (DLR)

Monner, Hans Peter and Riemenschneider, Johannes and Opitz, Steffen and Schulz, Martin (2011) Development of active twist rotors at the German Aerospace Center (DLR). 16th AIAA/ASME/AHS Adaptive Structures Conference, 04. - 07. April 2011, Denver, USA.

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Abstract

Helicopter main rotors are characterized by complex unsteady aerodynamic conditions, which are causing vibrations and noise in and around rotary wing aircrafts. The aerodynamic conditions also cause increased drag, which leads to higher fuel consumption. Even modern helicopters still suffer from these drawbacks. This is why there are many efforts to influence the flow conditions by passive and active means. Active means have the advantage to adapt to varying demands, which can change significantly. A first attempt is to perform a sinoidal variation of the pitch angle of the blades with a frequency that is an integer multiple of the rotor frequency, the so called higher harmonic frequencies. This can be done by additional displacements of the swash plate or by a variation of the pitch link length using actuated pitch links. Since both designs have several drawbacks, one of the most promising approaches is the realization of a secondary control via the deformation of individual blades. Such an actuation can be realized by blade flaps or by the integration of piezoelectric actuators in the blade itself, which causes the blade to twist. At the DLR such twist blades have been investigated intensively. A series of blades has been built using thin skin integrated actuators. This Paper gives an overview of all active twist blades with skin integrated actuators that have been designed and manufactured at the DLR so far. Different design philosophies have lead to different geometrical setups. A comparison of the blades power consumption for given control laws for noise and vibration reduction is also given. Finally, a unique testing technique for nondestructive measurement of mass distribution is discussed in this paper. are characterized by complex unsteady aerodynamic conditions, which are causing vibrations and noise in and around rotary wing aircrafts. The aerodynamic conditions also cause increased drag, which leads to higher fuel consumption. Even modern helicopters still suffer from these drawbacks. This is why there are many efforts to influence the flow conditions by passive and active means. Active means have the advantage to adapt to varying demands, which can change significantly. A first attempt is to perform a sinoidal variation of the pitch angle of the blades with a frequency that is an integer multiple of the rotor frequency, the so called higher harmonic frequencies. This can be done by additional displacements of the swash plate or by a variation of the pitch link length using actuated pitch links. Since both designs have several drawbacks, one of the most promising approaches is the realization of a secondary control via the deformation of individual blades. Such an actuation can be realized by blade flaps or by the integration of piezoelectric actuators in the blade itself, which causes the blade to twist. At the DLR such twist blades have been investigated intensively. A series of blades has been built using thin skin integrated actuators. This Paper gives an overview of all active twist blades with skin integrated actuators that have been designed and manufactured at the DLR so far. Different design philosophies have lead to different geometrical setups. A comparison of the blades power consumption for given control laws for noise and vibration reduction is also given. Finally, a unique testing technique for nondestructive measurement of mass distribution is discussed in this paper.

Item URL in elib:https://elib.dlr.de/70496/
Document Type:Conference or Workshop Item (Speech)
Title:Development of active twist rotors at the German Aerospace Center (DLR)
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Monner, Hans PeterUNSPECIFIEDUNSPECIFIED
Riemenschneider, JohannesUNSPECIFIEDUNSPECIFIED
Opitz, SteffenUNSPECIFIEDUNSPECIFIED
Schulz, MartinUNSPECIFIEDUNSPECIFIED
Date:April 2011
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Keywords:Helicopter main rotors
Event Title:16th AIAA/ASME/AHS Adaptive Structures Conference
Event Location:Denver, USA
Event Type:international Conference
Event Dates:04. - 07. April 2011
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:L VU - Air Traffic and Environment (old)
DLR - Research area:Aeronautics
DLR - Program:L VU - Air Traffic and Environment
DLR - Research theme (Project):L - Quiet Air Traffic (old)
Location: Braunschweig
Institutes and Institutions:Institute of Composite Structures and Adaptive Systems > Adaptronics
Deposited By: Böhringer-Thelen, Isolde
Deposited On:21 Jul 2011 14:50
Last Modified:21 Jul 2011 14:50

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