In order to design high-speed precision parallel mechanism

dynamic response of elastic vibration of planar 2-DOF parallel mechanism is analyzed

in connection with the main types of vibration

active control measures is proposed

and state space model of the active control of elastic vibration is established.In terms of system response speed and control energy

performance index of functional type is given which used measure the merits of quality control

optimal active control of elastic vibration is realized

the results show that the optimal active control can reduce significantly the level of the elastic vibration

positioning accuracy and precision movement of end point of mechanism is improved

the range and the amplitude of control energy are small

the method realized easily in engineering.