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Etude du comportement dynamique d’un système multi-étages à engrènements en cascade et décalés à dentures droites et hélicoïdales - Optimisation des corrections de profil

Abstract : This research work, conducted in cooperation with Hispano-Suiza (SAFRAN group), is focused on the modelling and analysis of vibrations and dynamic loads in aeronautical multi-mesh gears comprising several spatial gear arrangements (idler gears, several pinions on one shaft). An original model is presented which relies on the simultaneous solution of the equations of motion and the instant contact conditions for all the tooth contacts and all the meshes. The phasing between the various meshes along with tooth shape modifications are integrated in the simulations. Based on a number of simulation results, it is shown that linear symmetric profile modifications can substantially reduce dynamic tooth loads over of broad range of speeds. It is also confirmed that dynamic mesh forces are strongly correlated with the time-variations amplitudes of local quasi-static transmission errors under load. Considering several gear arrangements, tooth profile optimisations have been performed using a genetic algorithm which indicate that optimum reliefs always lie in the vicinity of the so-called ‘modified Master Curve’ initially defined for a single pinion-gear pair. This finding suggests that the concept of Master Curve can probably be extended to more complex gear systems. The simulation results prove that all the optimal profile modifications on the Master Curve improve the dynamic tooth loading conditions in multi-mesh gears. However, for systems submitted to several load levels, short optimal reliefs seem preferable whereas long optimal reliefs are more effective in terms of root stresses.
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https://tel.archives-ouvertes.fr/tel-02004471
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  • HAL Id : tel-02004471, version 1

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Hassen Fakhfakh. Etude du comportement dynamique d’un système multi-étages à engrènements en cascade et décalés à dentures droites et hélicoïdales - Optimisation des corrections de profil. Mécanique [physics.med-ph]. Université de Lyon, 2016. Français. ⟨NNT : 2016LYSEI071⟩. ⟨tel-02004471⟩

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