The effect of vibration reduction is analyzed for viscoelastic damping layer of gearbox device.A viscoelastic material is added to the internal and external wall of the gearbox oil-pan.A finite element model is established

meanwhile the modal analysis

the dynamic response and structure noise is calculated. The influence on vibration performance by different thickness damped is studied

the scientific theory basis of damp vibration reduction technology in the application of gear system is provided.