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Comparing Different Approaches for Modeling the Vertical Motion of the EC 135

Seher-Weiß, Susanne (2015) Comparing Different Approaches for Modeling the Vertical Motion of the EC 135. CEAS Aeronautical Journal, 6 (3), pp. 395-406. Springer. DOI: 10.1007/s13272-015-0150-7 ISBN 1869-5582 ISSN 1869-5590

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Official URL: http://link.springer.com/article/10.1007/s13272-015-0150-7

Abstract

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. For this helicopter, the formulation with flapping angles in its classical hybrid form shows some higher order deficiency in the match of the longitudinal and lateral accelerations, which are not apparent in the implicit model. After ruling out other effects, the discrepancies can be attributed to a vertical offset of the center of gravity from its assumed position. Once this offset is accounted for in the data, results from the two modeling approaches can be compared to each other and to theoretical predictions.

Item URL in elib:https://elib.dlr.de/95286/
Document Type:Article
Title:Comparing Different Approaches for Modeling the Vertical Motion of the EC 135
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Seher-Weiß, SusanneFT-HUBUNSPECIFIED
Date:September 2015
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:6
DOI :10.1007/s13272-015-0150-7
Page Range:pp. 395-406
Publisher:Springer
Series Name:CEAS Aeronautical Journal
ISSN:1869-5590
ISBN:1869-5582
Status:Published
Keywords:System identification, Inflow dynamics, Coning dynamics, Rotor dynamics, Hinge offset, EC 135
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:air traffic management and operations
DLR - Research area:Aeronautics
DLR - Program:L AO - Air Traffic Management and Operation
DLR - Research theme (Project):L - Air Transport Concepts and Operation (old)
Location: Braunschweig
Institutes and Institutions:Institute of Flight Systems > Rotorcraft
Deposited By: Seher-Weiß, Susanne
Deposited On:06 Oct 2015 13:04
Last Modified:06 Oct 2015 13:04

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