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

Seher-Weiß, Susanne and Tischler, Mark and Scepanovic, Pavle and Gubbels, Arthur (2019) Bell 412 System Identification and Model Fidelity Assessment for Hover and Forward Flight. In: Proceedings of the 8th Asian/Australian Rotorcraft Forum. 8th Asian/Australian Rotorcraft Forum, 30. Okt. - 2. Nov. 2019, Ankara, Türkei.

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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. The identified hover model includes besides the classical 6-DoF rigid body states, as extension inflow and 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 kt) 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 FLIGHLAB simulation model.

Item URL in elib:https://elib.dlr.de/130350/
Document Type:Conference or Workshop Item (Speech)
Title:Bell 412 System Identification and Model Fidelity Assessment for Hover and Forward Flight
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Seher-Weiß, SusanneFT-HUBhttps://orcid.org/0000-0002-6913-7764
Scepanovic, PavlePavle.Scepanovic (at) dlr.deUNSPECIFIED
Gubbels, ArthurNRC Flight Research LaboratoryUNSPECIFIED
Date:30 October 2019
Journal or Publication Title:Proceedings of the 8th Asian/Australian Rotorcraft Forum
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:system identification, Bell 412, helicopter, fidelity assessment
Event Title:8th Asian/Australian Rotorcraft Forum
Event Location:Ankara, Türkei
Event Type:international Conference
Event Dates:30. Okt. - 2. Nov. 2019
Organizer:Asian/Australian Rotorcraft Forum Organizin Commitee
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 Innovative Rotorcraft (old)
Location: Braunschweig
Institutes and Institutions:Institute of Flight Systems > Rotorcraft
Deposited By: Seher-Weiß, Susanne
Deposited On:14 Jan 2020 18:24
Last Modified:14 Jan 2020 18:24

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