[1] MAO J H,HIROYUKI T.Precision positioning of a DC-motor-driven aerostatic slide system[J].Precision Engineering,2003,27:32-41.
[2] HEUI J P,SUNG L D.Ultra precision positioning system for servo motor-piezo actuator using the dual servo loop and digital filter implementation[J].International Journal of Machine Tools & Manufacture,2001,41:51-63.