Adaptive And Repetitive Digital Control Algorithms for Noncircular Machining

This paper presents experimental results of digital tracking control algorithms applied to a hydraulic linear actuating system for tool positioning in noncircular machining. Noncircular machining is accomplished by controlling the tool position in the direction normal to the surface of the rotating workpiece. Implementation of two robust tracking controllers is presented: one is the adaptive zero phase error tracking controller for tracking arbitrary shaped desired signals, and the other is the digital repetitive controller for tracking periodic desired signals.