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Model Validation and Analysis Using Feedforward Control Flight Test Data

Wartmann, J. (2012) Model Validation and Analysis Using Feedforward Control Flight Test Data. Deutscher Luft- und Raumfahrtkongress, 10.-12. Sept. 2012, Berlin, Deutschland.

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Abstract

The German Aerospace Center (DLR) operates the ACT/FHS research helicopter with a full model-based control system operating from hover to 120 kn forward flight including take-off and landing as a key element of the ALLFlight project. The used feedforward controller is based on linear model inversion of identified local models, therefore the overall feedforward controller performance is highly dependent on the accuracy of the used inverted models. While several approaches exist to validate model accuracy in time and frequency domain, a validation method for model inversion purposes is rarely treated in literature. In this paper a flight test campaign that has been conducted to analyze model validity of the feedforward controller is presented and evaluated. A new model validation method using the feedforward controller to follow a reference command is discussed. Measured deviations from the commanded references are evaluated in time domain to highlight the model subsystems that are not precisely represented by the linear models. The obtained results are compared with a validation method from system identification. Model extensions are proposed to increase the model accuracy for feedforward controller usage.

Item URL in elib:https://elib.dlr.de/77348/
Document Type:Conference or Workshop Item (Speech)
Title:Model Validation and Analysis Using Feedforward Control Flight Test Data
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Wartmann, J.johannes.wartmann (at) dlr.deUNSPECIFIED
Date:11 September 2012
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:model validation feedforward control allflight act fhs
Event Title:Deutscher Luft- und Raumfahrtkongress
Event Location:Berlin, Deutschland
Event Type:national Conference
Event Dates:10.-12. Sept. 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: Wartmann, Johannes
Deposited On:13 Feb 2013 15:14
Last Modified:13 Feb 2013 15:14

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