Closed-loop position control of a membrane based electrohydraulic actuator for an active damping system for portal milling machines

Active damping systems are able to suppress chatter in cutting processes by counteracting occurring vibrations. Main part of such an active system is the actuator, which provides the necessary energy for the counteracting. For the use in an active damping system for large scale machine tools, a highly dynamic electrohydraulic actuator with steel membranes instead of gliding gaskets has been developed. In this paper a controller, which increases positioning accuracy and bandwidth of this actuator is presented.