Control laws for chatter suppression in milling using an inertias actuator

摘要

In this paper an inertial actuator is used to design an active damper for chatter suppression in a milling process. Researchers usually use the Direct Velocity Feedback (DVF) technique to design the control law for the actuator. This DVF technique is widely used for its simplicity and leads to very good results. However, it can easily excite the structural modes of the actuator and make unstable the closed-loop system. A Virtual Passive Absorber (VPA) control law is proposed to avoid this drawback. This kind of controllers are less likely to excite the actuator since the control effort is focused on the problematic mode of the structure. The parameters of the VPA controller are chosen to reduce the real part of the frequency response function (FRF) of the structure, which is well known to be important to determine the stability region. Several practical experiments are performed to show the usefulness of the control laws comparing the performance of both of them. The VPA control is tested in a pair of practical milling processes as well.