Porous material effect on gearbox vibration and acoustic behavior

In this paper, we define a resolution method to study the effect of a porous material on
vibro-acoustic behavior of a geared transmission. A porous plate is coupled with the gearbox
housing cover. The developed model depends on the gearbox characteristic and poroelastic
parameters of the porous material. To study the acoustic effect of the housing cover,
the acoustic transmission loss is computed by simulating numerically the elastic-porous coupled
plate model, and the numerical implementation is performed by directly programming
the mixed displacement-pressure formulation. To study the vibration effect, the bearing displacement
is computed using a two-stage gear system dynamical model and used as the
gearbox cover excitation. Numerical implementation is performed by direct programming of
the Leclaire formulation.