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Bell 412 System Identification and Model Fidelity Assessment for Hover and Forward Flight

Seher-Weiß, Susanne and Tischler, M. B. and Scepanovic, Pavle and Gubbels, Arthur (2020) Bell 412 System Identification and Model Fidelity Assessment for Hover and Forward Flight. Journal of the American Helicopter Society, 66, 012004-1. American Helicopter Society. doi: 10.4050/JAHS.66.012004. ISSN 0002-8711.

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Abstract

Frequency domain system identification of higher order models for the Bell 412 helicopter was performed. First, a frequency response database was derived from flight-test data. For hover, a combination of sweep and 2311-multistep maneuvers had to be used to achieve good results. In addition to the classical six-DoF (degrees of freedom) rigid body states, the identified hover model includes dynamic inflow, rotor coning dynamics, and uses a Padé approximation for the influence of engine dynamics, to improve the response in the vertical axis. The forward flight (60 kn) model includes as extension first-order flapping dynamics, mainly to improve the roll and pitch response. Besides the simple Padé approach used in the hover model, two different engine model structures were investigated but they provided no significant improvement compared to the Padé solution when coupled to the rigid-body model. Finally, a method derived from feedforward principles of model following control is shown, to use the identified hover model to analytically derive an "input filter" correction that improves the fidelity of a linearized FLIGHTLAB simulation model.

Item URL in elib:https://elib.dlr.de/136335/
Document Type:Article
Title:Bell 412 System Identification and Model Fidelity Assessment for Hover and Forward Flight
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Seher-Weiß, SusanneFT-HUBhttps://orcid.org/0000-0002-6913-7764
Tischler, M. B.U.S. Army, Ames Research Center, Moffet FieldUNSPECIFIED
Scepanovic, PavlePavle.Scepanovic (at) dlr.deUNSPECIFIED
Gubbels, ArthurNRC Flight Research LaboratoryUNSPECIFIED
Date:2 September 2020
Journal or Publication Title:Journal of the American Helicopter Society
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:66
DOI :10.4050/JAHS.66.012004
Page Range:012004-1
Publisher:American Helicopter Society
ISSN:0002-8711
Status:Published
Keywords:helicopter system identification, hover, engine model, fidelity assessment
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 (old)
Location: Braunschweig
Institutes and Institutions:Institute of Flight Systems > Rotorcraft
Deposited By: Seher-Weiß, Susanne
Deposited On:13 Jan 2021 10:19
Last Modified:13 Jan 2021 10:19

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