Simulation of the dynamic behaviour of a geared transmission on hydrodynamic journal bearings

Romain Fargere , Jean-Francois Sigrist (1) , Raphael Bosio , Christian Menard , Philippe Velex (2)

1 Service Technique et Scientifique
2 LaMCoS - Laboratoire de Mécanique des Contacts et des Structures [Villeurbanne]

Geared transmissions are inherently noisy but their capacity to match the speeds and torques from one machine to another makes them irreplaceable in a number of high power applications such as marine propulsion. In such systems, stealthiness is often crucial and the prediction and control of the radiated noise is therefore an important research topic. In this paper, an original approach is proposed which combines (i) a mechanical model for gears based on finite elements which accounts for deformable bodies and shafts and (ii) the reaction forces from the journal bearings using the “short bearing” approximation. The equations of motion, the normal contact problem between the teeth, along with the bearing reaction forces are solved iteratively. The procedure is applied to a single stage transmission for various running conditions and gear geometry. The influence of the helix angle is investigated and emphasis is placed on the time and spectral representations of the bearing reactions which largely control the structure-borne noise generated by the gear mesh.

Mots clés: geared transmission; bearings; noise; vibration

Domaines: Acoustique [physics.class-ph]

Romain Fargere, Jean-Francois Sigrist, Raphael Bosio, Christian Menard, Philippe Velex. Simulation of the dynamic behaviour of a geared transmission on hydrodynamic journal bearings. Acoustics 2012, Apr 2012, Nantes, France. ⟨hal-00810744⟩