Model-based disturbance attenuation for CNC machining centers in cutting process

A disturbance attenuation method in a control system, called the model-base d disturbance attenuator (MBDA), is proposed, and its properties are studie d in this paper. The MBDA makes the plant perform similarly to the nominal plant, as much as possible, using a compensator. Then, a controller is desi gned based on the nominal plant. It is very simple and easy to implement. I t is shown that the MBDA is extremely robust with respect to large variatio ns of load inertia, The MBDA is implemented in a position control system of a computer numerical control (CNC) machining center, where the velocity co ntrol system is composed of a servo-pack (proportional plus integral speed controller), a servo motor, and a load, The MBDA attenuates external distur bances significantly in the cutting process containing high-frequency compo nents, as well as the frictional forces containing large de component. To s how the effectiveness of the MBDA, several other controllers are also imple mented in a position control system of a CNC machining center in a similar way as the MBDA, and the experimental results are compared with one another .