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A Contribution to the Development of a Fullflight Envelope Quasi-Nonlinear Helicopter Simulation

Greiser, Steffen and Seher-Weiß, Susanne (2012) A Contribution to the Development of a Fullflight Envelope Quasi-Nonlinear Helicopter Simulation. In: Proceedings: Deutscher Luft- und Raumfahrtkongress. Deutscher Luft- und Raumfahrtkongress, 10.-12. September 2012, Berlin.

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Helicopter modeling is a complex task as helicopters consist of many subsystems (nacelle, rotor, engine, $\cdots$) that are described by coupled differential equations. Controller design requires a model that is accurate over a certain frequency range. Usually, system identification is used to derive the models from flight test data and the model complexity depends on the frequency range of interest. As helicopters have eigenvalues that vary depending on airspeed, system identification is performed at different operating points. Each identified linear model is then valid only in a small region around the corresponding operating point. To arrive at a model that covers the whole operational envelope of the helicopter, the individual models are stitched together. This paper describes the derivation of a quasi-nonlinear model accounting for known nonlinear terms such as gravity, inertia or trim curves. In addition, the coefficients of the identified linear matrices are interpolated depending on airspeed. Finally, the quasi-nonlinear as well as linear model is compared against flight test data using model validation techniques. As the quasi-nonlinear model of the Flying Helicopter Simulator (FHS) is validated, it can be used for a sophisticated controller design.

Item URL in elib:https://elib.dlr.de/76727/
Document Type:Conference or Workshop Item (Speech)
Title:A Contribution to the Development of a Fullflight Envelope Quasi-Nonlinear Helicopter Simulation
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Seher-Weiß, SusanneUNSPECIFIEDhttps://orcid.org/0000-0002-6913-7764UNSPECIFIED
Date:10 September 2012
Journal or Publication Title:Proceedings: Deutscher Luft- und Raumfahrtkongress
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:system identification, helicopter, model stitching
Event Title:Deutscher Luft- und Raumfahrtkongress
Event Location:Berlin
Event Type:national Conference
Event Dates:10.-12. September 2012
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Rotorcraft (old)
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: Greiser, Steffen
Deposited On:15 Feb 2013 15:01
Last Modified:27 Mar 2024 15:05

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