Observatorio de I+D+i UPM

Memorias de investigación
Communications at congresses:
ASYMPTOTIC DESCRIPTION OF FLUTTER AMPLITUDE SATURATION BY NONLINEAR FRICTION FORCES
Year:2012
Research Areas
  • Aeronautical engineering,
  • Aeroacustics and vibrations
Information
Abstract
The computation of the non-linear vibration dynamics of an aerodynamically unstable bladed-disk is a formidable numerical task, even for the simplified case of aerodynamic forces assumed to be linear. The nonlinear friction forces effectively couple dif- ferent travelling waves modes and, in order to properly elucidate the dynamics of the system, large time simulations are typically required to reach a final, saturated state. Despite of all the above complications, the output of the system (in the friction microslip regime) is basically a superposition of the linear aeroelastic un- stable travelling waves, which exhibit a slow time modulation that is much longer than the elastic oscillation period. This slow time modulation is due to both, the small aerodynamic effects and the small nonlinear friction forces, and it is crucial to deter- mine the final amplitude of the flutter vibration. In this presenta- tion we apply asymptotic techniques to obtain a new simplified model that captures the slow time dynamics of the amplitudes of the travelling waves. The resulting asymptotic model is very re- duced and extremely cheap to simulate, and it has the advantage that it gives precise information about the characteristics of the nonlinear friction models that actually play a role in the satura- tion of the vibration amplitude.
International
Si
Congress
13th International Symposium on Unsteady Aerodynamics, Aeroacoustics and Aeroelasticity of Turbomachines
960
Place
Tokio, Japón
Reviewers
Si
ISBN/ISSN
CDP12UPM
Start Date
11/09/2012
End Date
14/09/2012
From page
94
To page
94
ISUAAAT 13, Book of Abstracts
Participants
  • Autor: Carlos Martel Escobar (UPM)
  • Autor: Roque Corral Garcia (UPM)
Research Group, Departaments and Institutes related
  • Creador: Grupo de Investigación: Dinámica y estabilidad no lineal en ingeniería aeroespacial
  • Departamento: Motopropulsión y Termofluidodinámica
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