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Whirl flutter stability assessment using rotor transfer matrices

Koch, Christopher (2022) Whirl flutter stability assessment using rotor transfer matrices. In: 19th International Forum on Aeroelasticity and Structural Dynamics, IFASD 2022. International Forum on Aeroelasticity and Structural Dynamics (IFASD) 2022, 13.-17. Juni 2022, Madrid, Spanien. ISBN 978-840942353-8.

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The aeroelastic instability phenomenon called whirl flutter is of increased interest for the flutter assessment of aircraft, as a new generation of propeller aircraft is being developed. For the modelling of whirl flutter, a description of the motion induced forces on the propeller is necessary. Classical theory uses analytically derived coefficients for this purpose, but with some approximations. This paper presents a new method, called the transfer matrix method, to describe these transfer functions from hub motion to hub forces in the frequency domain and increase fidelity of whirl flutter assessment. Instead of deriving the transfer functions, they are identified from a time domain model of the isolated propeller, for which several fidelity levels already exist. For propellers in axial flow it comes down to two time domain pulseperturbations of the hub DOF to identify the spectrum of transfer matrices. The usage of this method is demonstrated in the paper using simple propeller models and results are compared to the classical method as well as coupled time domain simulations. Results show a very good agreement with both references, but also the potential benefits of including blade flexibility and more complex aerodynamics into the whirl flutter assessment in the frequency domain.

Item URL in elib:https://elib.dlr.de/187025/
Document Type:Conference or Workshop Item (Speech)
Title:Whirl flutter stability assessment using rotor transfer matrices
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Koch, ChristopherUNSPECIFIEDhttps://orcid.org/0000-0001-8014-3041UNSPECIFIED
Date:June 2022
Journal or Publication Title:19th International Forum on Aeroelasticity and Structural Dynamics, IFASD 2022
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Keywords:aeroelastic stability, frequency domain, propeller, whirl flutter
Event Title:International Forum on Aeroelasticity and Structural Dynamics (IFASD) 2022
Event Location:Madrid, Spanien
Event Type:international Conference
Event Dates:13.-17. Juni 2022
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Efficient Vehicle
DLR - Research area:Aeronautics
DLR - Program:L EV - Efficient Vehicle
DLR - Research theme (Project):L - Digital Technologies
Location: Göttingen
Institutes and Institutions:Institute of Aeroelasticity > Aeroelastic Simulation
Deposited By: Koch, Christopher
Deposited On:22 Aug 2022 13:11
Last Modified:18 Aug 2023 11:51

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