document: Ultra-high speed positioning control of a gravure engraving unit using a discrete-time two-degree-of-freedom H/sub infinity / control The piezoelectric actuator has high-speed response in comparison with the electro-magnetic actuator . However , it is not easy to achieve both high-speed and high-precision response by feedforward control only because the piezoelectric element has nonlinear properties such as the hysteresis effect . Thus , feedback control is required to achieve good performance . We develop a control design method to achieve both high-speed and high-precision response for piezoelectric actuators using the discrete-time H/sub infinity / control method and the two-degree-of-freedom control scheme . The effectiveness of our proposed method has been shown by simulation and experimental results . The most important contribution of our study is that our method can be directly applied to commercial machines
doc_bio_tags: O O O O O O B I I O O O O O O O O O B 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 B O O O O O O O B I O O O B O O O O B I 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 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 O O O O O O O
extractive_keyphrases: gravure engraving unit piezoelectric actuator control design method feedforward nonlinear properties hysteresis feedback control
abstractive_keyphrases: ultra-high speed positioning control discrete-time two-degree-of-freedom h/sub infinity / control high-precision response digital control system