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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.

Full text not available from this repository.

Abstract

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
Authors:
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 SCOPUS:No
In ISI Web of Science:No
Status:Published
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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