Viscoelastic torsional damper model

Torsional vibrations are one of most common problems in power transmission system. Their noxious effects are more significant in large reduction systems or with high torque variation. Several devices have been developed for damping these type of vibrations. In this work the analysis of the viscoelastic damping system is presented. The damper consist of an inner ring mounted to a shaft, an intermediate viscoelastic ring and an outer ring. This ring can be a V pulley or a gear, for example. The viscoelastic characterization of the material is adopted in replace of the artificial damping coefficient. In this way the material properties are included in the dynamic model. Thus a more accurate representation of the physical phenomenon can be achieved. The mathematical model is obtained using an Euler-Lagrange approach. Numerical results are compared with experimental test results. From them, a detailed analysis of the damping effects of the design parameters is presented.