Reference : Modélisation par éléments finis du couplage thermo-élastique dans les structures vibrantes
Diverse speeches and writings : Conference given outside the academic context
Engineering, computing & technology : Aerospace & aeronautics engineering
Engineering, computing & technology : Mechanical engineering
Modélisation par éléments finis du couplage thermo-élastique dans les structures vibrantes
Lepage, Séverine [Université de Liège - ULiège > > LTAS - Vibrations et Identification des Structures > >]
Golinval, Jean-Claude mailto [Université de Liège - ULiège > Département d'aérospatiale et mécanique > LTAS - Vibrations et identification des structures >]
7ème Colloque National en Calcul des Structures
du 17 au 20 mai 2005
Association Calcul des Structures et Modélisation
Association Française de Mécanique
Laboratoire Roberval de Mécanique
[en] Finite Element Method ; Thermoelastic coupling ; Thermoelastic damping ; Microstructures
[en] Micro-accelerometers and micro-gyrometers are being developed in order to respond to the demand of accurate miniature inertial navigation systems. In the design of such accurate systems, which require a high quality factor, the dissipation mechanisms such as the thermoelastic damping have to be considered. In order to assess the thermoelastic influence on the behavior of vibrating structures, analytical models may be used for simple configurations under very restrictive assumptions. In order to investigate more complex structures, the finite element method may be used. An oscillating clamped-clamped beam is modelled using thermoelastic finite elements. The analytical and finite element analyses show that the thermoelastic coupling implies a natural frequency shift, an amplitude attenuation, a difference of phase between the thermal and mechanical degrees of freedom and influences the quality factor of the resonating system.
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