Approche globale pour I' analyse de Ia reponse vibratoire d'une transmission par engrenages
Keywords:
gearbox dynamics, modelling, finite element method, modal analysis, dynamic interactions, mesh force, mean square vibrational velocity of housingAbstract
In order to analyse dynamic response of a gearbox, we proposed a method based on the modelling of all the components (gears, shafts, bearings and housing). Forced response of the whole gearbox was computed using a spectral and iterative method. The analysis of coupling mechanisms between dynamic mesh force and mean square vibrational velocity of housing showed that a resonant excitation of modes which have a high potential energy associated with mesh stiffness and bearing stiffnesses leads to the highest vibrational responses. Bearings stiffnesses and mechanical properties of housing have an appreciable influence on these vibrational responses. Our methodology and numerical results allowed to propose new designs which lead to a significant reduction of the mean square vibrational velocity of housing of the gearbox, for a wide range of frequencies.
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