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Suppression of Regressive Lead-Lag to Improve Roll Bandwidth in Helicopter Flight Control Systems

Greiser, Steffen and Grünhagen, Wolfgang von (2020) Suppression of Regressive Lead-Lag to Improve Roll Bandwidth in Helicopter Flight Control Systems. In: DLRK 2020. Deutscher Luft- und Raumfahrtkongress 2020, 1. - 3. September 2020, Aachen, Germany.

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Helicopter flight has to be safe and the control of the helicopter has to fulfil specific requirements on static and dynamic stability. A typical design goal for the roll axis is to achieve a stable response with a roll bandwidth larger than approx. 2-3 rad/s for midsize rotorcraft. During the first phase of the EC135 ACT/FHS research flight control design, a low-damped roll oscillation at approx. 1.8 Hz or 12 rad/s was observed. This effect was interpreted as air resonance which was excited by the research flight control system. Two different approaches have been flight-tested to suppress this oscillation: an input filter and disturbance feed-forward. The paper presents the low-order equivalent model, the control system, and flight test results. Both approaches showed a good performance in flight while the disturbance feedforward achieves a slightly higher bandwidth and more phase margin

Item URL in elib:https://elib.dlr.de/138382/
Document Type:Conference or Workshop Item (Speech)
Title:Suppression of Regressive Lead-Lag to Improve Roll Bandwidth in Helicopter Flight Control Systems
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Greiser, Steffensteffen.greiser (at) hs-osnabrueck.deUNSPECIFIED
Grünhagen, Wolfgang vonDLR - FT- HubschrauberUNSPECIFIED
Date:September 2020
Journal or Publication Title:DLRK 2020
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:Helicopter, Control System, Air Resonance, Roll Bandwidth, EC135 ACT/FHS
Event Title:Deutscher Luft- und Raumfahrtkongress 2020
Event Location:Aachen, Germany
Event Type:national Conference
Event Dates:1. - 3. September 2020
Organizer:Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V.
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 - Human factors and safety in Aeronautics (old)
Location: Braunschweig
Institutes and Institutions:Institute of Flight Systems > Rotorcraft
Deposited By: Grünhagen, Dr.-Ing. Wolfgang
Deposited On:12 Jan 2021 15:22
Last Modified:12 Jan 2021 15:44

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