document: High-performance servo systems based on multirate sampling control In this paper , novel multirate two-degree-of-freedom controllers are proposed for digital control systems , in which the sampling period of plant output is restricted to be relatively longer than the control period of plant input . The proposed feedforward controller assures perfect tracking at M inter-sampling points . On the other hand , the proposed feedback controller assures perfect disturbance rejection at M inter-sample points in the steady state . Illustrative examples of position control for hard disk drive are presented , and advantages of these approaches are demonstrated
doc_bio_tags: O O O O O B I I O O O O O O O O O O O B I I O O O O O O O O O O O O O O O O O O O O O O O O O B O O O B O O O O O O O O O O O O B O O O B I O O O O O O O O O O O O B I O B I I O O O O O O O O O O
extractive_keyphrases: multirate sampling control digital control systems tracking feedback feedforward position control hard disk drive disturbance rejection
abstractive_keyphrases: servo system