Asymptotic Description of Flutter Amplitude Saturation by Nonlinear Friction Forces

Martel Escobar, Carlos y Corral Garcia, Roque (2012). Asymptotic Description of Flutter Amplitude Saturation by Nonlinear Friction Forces. En: "13th International Symposium on Unsteady Aerodynamics, Aeroacoustics and Aeroelasticity of Turbomachines", 11/09/2012 - 14/09/2012, Tokio, Japón. p. 94.

Descripción

Título: Asymptotic Description of Flutter Amplitude Saturation by Nonlinear Friction Forces
Autor/es:
  • Martel Escobar, Carlos
  • Corral Garcia, Roque
Tipo de Documento: Ponencia en Congreso o Jornada (Artículo)
Título del Evento: 13th International Symposium on Unsteady Aerodynamics, Aeroacoustics and Aeroelasticity of Turbomachines
Fechas del Evento: 11/09/2012 - 14/09/2012
Lugar del Evento: Tokio, Japón
Título del Libro: 13th International Symposium on Unsteady Aerodynamics, Aeroacoustics and Aeroelasticity of Turbomachines
Fecha: 11 Septiembre 2012
Materias:
Escuela: E.T.S.I. Aeronáuticos (UPM) [antigua denominación]
Departamento: Fundamentos Matemáticos de la Tecnología Aeronáutica [hasta 2014]
Licencias Creative Commons: Reconocimiento - Sin obra derivada - No comercial

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Resumen

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.

Más información

ID de Registro: 20296
Identificador DC: http://oa.upm.es/20296/
Identificador OAI: oai:oa.upm.es:20296
Depositado por: Memoria Investigacion
Depositado el: 05 May 2014 15:42
Ultima Modificación: 21 Abr 2016 23:02
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