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The use of a closed loop controller scheme for the validation of nonlinear helicopter models

Scepanovic, Pavle and Greiser, Steffen (2019) The use of a closed loop controller scheme for the validation of nonlinear helicopter models. 19th ONERA-DLR Aerospace Symposium - ODAS 2019, 3.-5. June 2019, ONERA Meudon, France.

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Abstract

The focus of this study is the tool development for the validation of a nonlinear helicopter flight mechanic model used at the German Aerospace Center (DLR) in its real-time flight simulator by using a controller based approach. Validating a highly coupled, unstable, multi-input multi-output dynamic system is proved to be challenging. Closed-loop validation approach is selected and particular care was taken to ensure that the feedback controller does not induce correlated inputs and thus conceal the model characteristics. However, the closed-loop should be be performant enough to maintain the stable simulation. Model predictive ability is analyzed by root mean square error cost function and by comparing dynamic characteristics in the time domain of the model and the flight test data from DLR's research helicopter ACT/FHS at 60 knots, 3-2-1-1 multi-step inputs in all axes. The results show that the model correctly predicts the trends of the on-axis responses, but the off-axis responses have potential for improvement. Possible technique to enhance model fidelity is proposed in the conclusion.

Item URL in elib:https://elib.dlr.de/130829/
Document Type:Conference or Workshop Item (Speech)
Title:The use of a closed loop controller scheme for the validation of nonlinear helicopter models
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Scepanovic, PavlePavle.Scepanovic (at) dlr.deUNSPECIFIED
Greiser, SteffenSteffen.Greiser (at) dlr.deUNSPECIFIED
Date:June 2019
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Accepted
Keywords:rotorcraft, model validation, ACT/FHS
Event Title:19th ONERA-DLR Aerospace Symposium - ODAS 2019
Event Location:ONERA Meudon, France
Event Type:international Conference
Event Dates:3.-5. June 2019
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: Scepanovic, Pavle
Deposited On:14 Jan 2020 19:43
Last Modified:14 Jan 2020 19:43

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