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ACT/FHS System Identification Including Rotor and Engine Dynamics

Seher-Weiß, Susanne (2019) ACT/FHS System Identification Including Rotor and Engine Dynamics. Journal of the American Helicopter Society, 64 (2), 022003-1. American Helicopter Society. doi: 10.4050/JAHS.64.022003. ISSN 0002-8711.

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At the German Aerospace Center (DLR) Institute of Flight Systems, models of the Active Control Technology/Flying Helicopter Simulator (ACT/FHS), an EC135 with a fly-by-wire/light flight control system, are needed for control law development and simulation. Thus, models are sought that cover the whole flight envelope and are valid over a broad range of frequencies. Furthermore, if the models are to be used in the feedforward loop of the model following the control system, they have to be invertible and thus should not have any positive transmission zeros. For rotor flapping, the explicit formulation with flapping angles was modified slightly to avoid positive transmission zeros. For the regressive lead-lag, a simple model formulation was found that needs only one dipole with two states. The engine dynamics were first modeled separately and then coupled to the body/rotor model. The final integrated model has 17 states and yields a good match for frequencies up to 30 rad/s. All system identification was performed using the maximum likelihood method in the frequency domain.

Item URL in elib:https://elib.dlr.de/127489/
Document Type:Article
Title:ACT/FHS System Identification Including Rotor and Engine Dynamics
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Seher-Weiß, SusanneFT-HUBhttps://orcid.org/0000-0002-6913-7764
Date:April 2019
Journal or Publication Title:Journal of the American Helicopter Society
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.4050/JAHS.64.022003
Page Range:022003-1
EditorsEmailEditor's ORCID iD
Publisher:American Helicopter Society
Keywords:system identification, helicopter, rotor modeling, engine model
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 Smart Rotorcraft (old)
Location: Braunschweig
Institutes and Institutions:Institute of Flight Systems > Rotorcraft
Deposited By: Seher-Weiß, Susanne
Deposited On:01 Jul 2019 15:21
Last Modified:31 Jul 2019 20:25

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