4Yaqiu -Liu, Qu Wu. The study on an improved PDF con- troller and its application in high order follow up system. Proceedings of the Eighth International Confer- ence on Machine Learning and Cybernetics,2009.
3M. -C. Tsa,i I. -F. Chiu andM. -Y. Cheng. Design and Implementation of Command and Friction FeedforwardControl for CNC Motion Controllers [ J ]. IEE Proceedings of Control Theory Application, 2004,15 1 ( 1 ).
