Abstract: Unable to confirm the contribution of hard coating damping on the whole system effectively， it becomes very difficult to establish the analytical model of hard coating composite structure of vibration reduction mechanism. The method of creating the damping mechanism model of beam was studied through separating the damping contribution of hard coating. First of all， the cantilever beams before/after coating were tested and the vibration characteristics parameters， such as natural frequency， damping ratio and vibration response were obtained. Moreover， by analyzing the energy stored and dissipated in the uncoated and coated beam， the damping contribution of hard coating was confirmed. At last， the Oberst beam theory was adopted to create the damping mechanism model of cantilever beam， with both material and viscous damping considered， and the correctness of analytical model was also verified. It shows that by using the hard-coating damping and the equivalent viscous damping of uncoated beam， the reasonable analysis model of coated beam can be created.

Key words: hard coating, cantilever beam, damping mechanism, analysis model, base excitation