Optimization of the Two-DOF passive damper for the machining vibration control based on the SDM

摘要

Two-DOF (Degree-of-Freedom) passive damper is found to be able to attain better performance than the Single-DOF damper in the machining vibration control. However, the optimization is much more complicated as there are more design variables. A new approach of optimizing the Two-DOF passive damper is proposed based on the Structural Dynamical Modification (SDM) method. The physical model of Two-DOF damper damping single mode is presented, and the Frequency Response Function (FRF) of the primary structure are formulated. Numerical simulation is carried out and the optimal geometrical parameters are obtained with an objective of H_∞ norm. It is found that the Two-DOF passive damper can achieve the best vibration suppression effect than the SDOF damper, two separate SDOF dampers and uniform-density bar while the mass ratio is the same.