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Comparing Explicit and Implicit Modeling of Rotor Flapping Dynamics for the EC 135

Seher-Weiß, Susanne and von Grünhagen, Wolfgang (2012) Comparing Explicit and Implicit Modeling of Rotor Flapping Dynamics for the EC 135. Deutscher Luft- und Raumfahrtkongress 2012, 10.-12. Sep. 2012, Berlin, Deutschland.

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In order to be valid up to higher frequencies, state space models derived by system identification methods have to include rotor states describing the dynamics of flapping and sometimes even downwash and regressive lag motion. In the case of flapping, the rigid-body equations are usually augmented by the explicit differential equations for the longitudinal and lateral flapping angles which are then coupled to the rigid-body equations through the corresponding force and moment terms. Alternatively, an implicit formulation can be used that includes the pitch and roll acceleration as model states. The paper compares the two modeling approaches for the EC 135 helicopter. It can be shown that for this helicopter the formulation with flapping angles in its classical hybrid form yields a poor match in the longitudinal and lateral accelerations. A comparison with results obtained from the equivalent formulation allows augmenting the model to better match the two linear accelerations. Numerical results from the two modeling approaches are compared to each other and to theoretical predictions.

Item URL in elib:https://elib.dlr.de/88615/
Document Type:Conference or Workshop Item (Speech)
Title:Comparing Explicit and Implicit Modeling of Rotor Flapping Dynamics for the EC 135
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
von Grünhagen, WolfgangFT-HSUNSPECIFIED
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
EditorsEmailEditor's ORCID iD
UNSPECIFIEDDeutsche Gesellschaft für Luft- und RaumfahrtUNSPECIFIED
Keywords:rotor flapping, system identification, modeling
Event Title:Deutscher Luft- und Raumfahrtkongress 2012
Event Location:Berlin, Deutschland
Event Type:national Conference
Event Dates:10.-12. Sep. 2012
Organizer:Deutsche Gesellschaft für Luft- und Raumfahrt
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Rotorcraft (old)
DLR - Research area:Aeronautics
DLR - Program:L RR - Rotorcraft Research
DLR - Research theme (Project):L - The Smart Rotorcraft (old)
Location: Braunschweig
Institutes and Institutions:Institute of Flight Systems > Rotorcraft
Deposited By: Seher-Weiß, Susanne
Deposited On:25 Mar 2014 14:14
Last Modified:08 May 2014 23:27

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