Memorias de investigación
Artículos en revistas:
ASYMPTOTIC DESCRIPTION OF FLUTTER AMPLITUDE SATURATION BY NONLINEAR FRICTION FORCES
Año:2012
Áreas de investigación
  • Ingeniería aeronaútica,
  • Tecnologías aéreo motoras
Datos
Descripción
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.
Internacional
Si
JCR del ISI
No
Título de la revista
Proceedings of the ISUAAAT 13, Tokyo, Japan
ISSN
CDP12UPM
Factor de impacto JCR
Información de impacto
Volumen
DOI
Número de revista
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Grupos de investigación, Departamentos, Centros e Institutos de I+D+i relacionados
  • Creador: Grupo de Investigación: Dinámica y estabilidad no lineal en ingeniería aeroespacial
  • Departamento: Motopropulsión y Termofluidodinámica