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ACT/FHS System Identification Including Rotor and Engine Dynamics

Seher-Weiß, Susanne (2017) ACT/FHS System Identification Including Rotor and Engine Dynamics. In: Annual Forum Proceedings - American Helicopter Society. AHS International 73rd Annual Forum & Technology Display, 9.-11. Mai 2017, Fort Worth, Texas, USA.

Full text not available from this repository.

Abstract

At the DLR Institute of Flight Systems models of the 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 control system, they have to be invertible and thus must not have any positive transmission zeros. Maximum likelihood system identification in the frequency domain was used to derive the desired models. 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 seventeen states and yields a good match for frequencies up to 30 rad/s.

Item URL in elib:https://elib.dlr.de/111578/
Document Type:Conference or Workshop Item (Speech)
Title:ACT/FHS System Identification Including Rotor and Engine Dynamics
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Seher-Weiß, Susanneft-hubUNSPECIFIED
Date:May 2017
Journal or Publication Title:Annual Forum Proceedings - American Helicopter Society
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:No
Status:Published
Keywords:system identification, helicopter, rotor modeling, engine model
Event Title:AHS International 73rd Annual Forum & Technology Display
Event Location:Fort Worth, Texas, USA
Event Type:international Conference
Event Dates:9.-11. Mai 2017
Organizer:American Helicopter Society
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
Location: Braunschweig
Institutes and Institutions:Institute of Flight Systems > Rotorcraft
Deposited By: Seher-Weiß, Susanne
Deposited On:06 Jun 2017 14:05
Last Modified:06 Jun 2017 14:05

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