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Whirl flutter analysis of a wind tunnel model using multidisciplinary simulation and multibody dynamics

Rezaeian, Alireza (2011) Whirl flutter analysis of a wind tunnel model using multidisciplinary simulation and multibody dynamics. In: Proceedings "ERF 2011". ERF 2011 - 37th European Rotorcraft Forum, 13.-15. Sept. 2011, Gallarate, Italien.

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Whirl flutter is a dynamic instability known mostly from tilt-rotors and prop-airplanes. For a tilt-rotor or prop- airplane, from one side the gyroscopic effect of the rotating rotor/propeller causes the coupling of the elastic modes of the propeller-nacelle system and produces the so-called whirl modes and from the other side the unsteady aerodynamic forces/moments generated due to the whirl modes change the damping of the system. With the reduction of the damping, the whole system can reach a zero or negative damping resulting in an oscillation of the system with constant or increasing amplitude, respectively. Classical analysis of whirl flutter is limited to a system with reduced degrees of freedom. However, going beyond this classical approach allows considering more physical effects. In this work a multidisciplinary simulation of the whirl flutter phenomenon is introduced. Different simulation codes are used to create the model and to simulate the physical effects. A FEM code is used to model the elasticity of the wing and nacelle. A propeller comprehensive code is utilized to consider the propeller induced velocity field for the calculation of the propeller aerodynamics. The full model is then implemented within a multibody simulation tool, which allows performing the dynamic stability analysis. The method introduced in this paper can be used for the whirl flutter investigation of any configuration.

Item URL in elib:https://elib.dlr.de/73272/
Document Type:Conference or Workshop Item (Speech, Paper)
Title:Whirl flutter analysis of a wind tunnel model using multidisciplinary simulation and multibody dynamics
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Rezaeian, Alirezaalireza.rezaeian (at) dlr.deUNSPECIFIED
Journal or Publication Title:Proceedings "ERF 2011"
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:aeroelasticity, whirl flutter, multidisciplinary simulation, multibody dynamics
Event Title:ERF 2011 - 37th European Rotorcraft Forum
Event Location:Gallarate, Italien
Event Type:international Conference
Event Dates:13.-15. Sept. 2011
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:other
DLR - Research area:Aeronautics
DLR - Program:L - no assignment
DLR - Research theme (Project):L - no assignment (old)
Location: Göttingen
Institutes and Institutions:Institute of Aeroelasticity
Deposited By: Erdmann, Daniela
Deposited On:21 Dec 2011 11:10
Last Modified:21 Dec 2011 11:10

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