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Structural Modeling and Validation of an Active Twist Model Rotor Blade

Hoffmann, Frauke and Keimer, Ralf and Riemenschneider, Johannes (2014) Structural Modeling and Validation of an Active Twist Model Rotor Blade. DLRK 2014, 16.-18. Sep. 2014, Augsburg, Deutschland.

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Abstract

DLR has been researching on active twist rotor blade control intensively for at least 15 years now. This research work included the design and manufacturing of model rotor blades with in the blade skin integrated actuators. As a main subject, numerical benefit studies with respect to rotor noise, vibration, and performance were carried out with DLR's rotor simulation code S4. Since this simulation code is based on a modal synthesis, it uses the natural blade frequencies and mode shapes to model the blade dynamics. Both, natural blade frequencies as well as mode shapes, are computed in advance employing a finite element beam model of the blade. Each beam element possesses certain structural properties that are derived from an ANSYS model for certain cross sections of the blade. Since model rotor blades are built for wind tunnel testing, they are highly instrumented with sensors and therefore vary in their structural properties along span. Modifications in the structural properties due to the instrumentation are not included in the ANSYS model. However, to account for these variations, two different experimental methods have been developed. This way, the most important structural properties can be determined for the real blade and the structural blade model can be improved. The paper describes the development of an advanced structural blade model for rotor simulation purposes and shows a validation of the structural blade model based on the measured non-rotating and rotating frequencies.

Item URL in elib:https://elib.dlr.de/90758/
Document Type:Conference or Workshop Item (Speech)
Title:Structural Modeling and Validation of an Active Twist Model Rotor Blade
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Hoffmann, Fraukefrauke.hoffmann (at) dlr.deUNSPECIFIED
Keimer, Ralfralf.keimer (at) dlr.deUNSPECIFIED
Riemenschneider, Johannesjohannes.riemenschneider (at) dlr.deUNSPECIFIED
Date:17 September 2014
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:structural properties, rotor blade, active twist, modeling, validation, natural blade frequencies
Event Title:DLRK 2014
Event Location:Augsburg, Deutschland
Event Type:national Conference
Event Dates:16.-18. Sep. 2014
HGF - Research field:other
HGF - Program:other
HGF - Program Themes:other
DLR - Research area:no assignment
DLR - Program:no assignment
DLR - Research theme (Project):no assignment
Location: Braunschweig
Institutes and Institutions:Institute of Flight Systems > Rotorcraft
Institute of Composite Structures and Adaptive Systems > Adaptronics
Deposited By: Hoffmann, Frauke
Deposited On:07 Oct 2014 15:43
Last Modified:13 Nov 2014 15:20

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