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Modeling of damping in elastohydrodynamic lubricated contacts : Application to gear dynamics

Abstract : The primary damping mechanisms present in geared systems are investigated based on a transient analysis of the elasto-hydrodynamic lubrication problem for line contacts. Several linear models are derived from extensive numerical simulations, which make it possible to simulate the damping caused by the lubricant squeezing by the teeth with and without momentary contact losses and impacts. A one-degree-of-freedom gear dynamic model is set up which combines these lubricant damping sources along with structural damping that reproduces the internal dissipation in gear elements. A number of comparisons with benchmark experimental evidence are presented for a range of operating conditions and gear geometries, which prove that the proposed approach is sound in the case of spur gears. It is shown that the damping associated with lubricant squeezing contributes for the most part when contact losses and shocks between the teeth occur at critical speeds. The case of helical gears is analyzed differently since no contact loss occurs for such gears. A simple three-dimensional model is thus developed which accounts for the dissipation in the mechanical parts surrounding the gears. A number of results are presented which, first, confirm the primary contribution of the gear mesh to the overall damping in spur gears, and second, show that bearings constitute the main source of damping in helical gears transmissions.
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  • HAL Id : tel-02005648, version 1

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Mouhamad Ankouni. Modeling of damping in elastohydrodynamic lubricated contacts : Application to gear dynamics. Mechanics [physics.med-ph]. Université de Lyon, 2016. English. ⟨NNT : 2016LYSEI089⟩. ⟨tel-02005648⟩

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