  We have developped a numerical tool in order to predict vibratory excitation
of a gearbox induced by the meshing process. We propose a method based on a 3D
Finite Element modelling of each toothed wheel. A non linear algorithm computes
the fluctuations of static transmission error and mesh stiffness. Numerical
simulations show the effect of wheel body deformation and the interactions
between adjacent loaded teeth. The method developped allows to analyse the
effect of different tooth modification types an manufacturing errors on the
static transmission error.
