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Uncertainties in Modelling Helicopter Dynamics: A Framework Applied to System Identification Results

Greiser, Steffen (2015) Uncertainties in Modelling Helicopter Dynamics: A Framework Applied to System Identification Results. 41st European Rotorcraft Forum, 01.-04. Sep. 2015, Munich, Germany.

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Abstract

Helicopters are heavily coupled, unstable and their modeling is often a difficult nut to crack. This often makes control design for the helicopter difficult. However, a goal for the near future for the EC135 Active Control Technology / Flying Helicopter Simulator (ACT/FHS) is high-performance control to assess the in-flight simulation capability. This stimulates the requirements for the feedback control design which is based on linear models derived by system identification. The core problem for this type of design is often a mismatch of the closed-loop behavior to measured flight test data. This paper focuses on the question how the design can be assisted to improve the plant's model, so that the gap between design and flight can be reduced. The framework relies on linear models derived by system identification. These linear models are stitched together to describe not only the operating point but also the flight envelope of interest. The linear models are also extended by non-physical models that describe the uncertainties. The model of the plant finally consists of two parts: the physics-based, stitched model and the non-physical uncertainties. Compared to the classical techniques system identification and nonlinear modeling, the framework proposed in this paper can be applied quickly and indicates possible model improvements. The paper shows the application of the whole framework to ACT/FHS flight test results.

Item URL in elib:https://elib.dlr.de/98479/
Document Type:Conference or Workshop Item (Speech)
Title:Uncertainties in Modelling Helicopter Dynamics: A Framework Applied to System Identification Results
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Greiser, Steffensteffen.greiser (at) dlr.deUNSPECIFIED
Date:1 September 2015
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:system identification, feedback control, model, plant, helicopter, ACT/FHS
Event Title:41st European Rotorcraft Forum
Event Location:Munich, Germany
Event Type:international Conference
Event Dates:01.-04. Sep. 2015
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: Greiser, Steffen
Deposited On:06 Oct 2015 14:20
Last Modified:10 May 2016 23:32

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