Chatter suppression with adaptive control in turning metal via application of piezoactuator

Self-excited vibration, so called chatter, is known to cause detrimental effects on the machined surface finish and to decrease the machining efficiency. In this paper, in order for chatter suppression, a piezoactuator is introduced for the regulation of the machine tool displacement. In order for the ultra-precision control in turning via piezoactuator, a model with hysteretic nonlinearity accounting for the dynamics of turning process, cutting tool and piezoactuator is presented. With this model, a robust adaptive controller for the metal cutting system of ultra-precision is proposed and the simulation results shows that the proposed adaptive controller significantly eliminates the chatter phenomena.