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Structural modeling and validation of an active twist model rotor blade

Hoffmann, Frauke and Keimer, Ralf and Riemenschneider, Johannes (2016) Structural modeling and validation of an active twist model rotor blade. CEAS Aeronautical Journal, 7 (1), pp. 1-13. Springer. DOI: • DOI: 10.1007/s13272-015-0173-0 ISSN 1869-5590

Full text not available from this repository.

Abstract

DLR has been researching on active twist rotor blade control for at least 15 years now. This research work included the design and manufacturing of model rotor blades within 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 and 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 experimental methods have been developed. They allow the determination of the real values for the most important structural blade properties such that the structural blade model is improved. The paper describes the experimental methods, as well as the development of an advanced structural blade model for rotor simulation purposes. It 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/101787/
Document Type:Article
Title:Structural modeling and validation of an active twist model rotor blade
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Hoffmann, FraukeFT-HUBUNSPECIFIED
Keimer, RalfFA-ADAUNSPECIFIED
Riemenschneider, JohannesFA-ADAUNSPECIFIED
Date:March 2016
Journal or Publication Title:CEAS Aeronautical Journal
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:No
Volume:7
DOI :• DOI: 10.1007/s13272-015-0173-0
Page Range:pp. 1-13
Publisher:Springer
ISSN:1869-5590
Status:Published
Keywords:Rotor blade – Active twist control – Structural blade model – FEM – Validation
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 of Composite Structures and Adaptive Systems > Adaptronics
Deposited By: Hoffmann, Frauke
Deposited On:14 Jan 2016 14:10
Last Modified:08 Mar 2018 19:01

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