  This study focus on the acoustical behavior of gearbox induced by the static
transmission error under load (STE). An original method is developed allowing
to compute simultaneously STE, meshing and bearings stiffnesses. These
characteristics mainly govern the vibrational and the acoustical behaviors of
the geared system. The proposed procedure is based on two computational methods
allowing to calculate the STE and the bearing equilibrium which are integrated
in a coupled computational procedure. The technique has been implemented to
treat an illustrating example and compared to standard uncoupled approach.
Comparative results concern the STE, meshing stiffness, bearings stiffnesses,
shafts misalignments, critical eigenmodes and associated critical running
speeds, housing vibratory response and radiated noise.
