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Dynamic modelling of an electro-hydraulic actuator to isolate machine tools from ground vibrations

: Wabner, Markus; Law, Mohit; Ihlenfeldt, Steffen

International Academy for Production Engineering -CIRP-, Paris:
11th International Conference on High Speed Machining, HSM 2014. Proceedings : Advances in Manufacturing Technology, September 11-12, 2014, Prague, Czech Republic
Prague, 2014
ISBN: 978-80-904077-7-0
Paper 14038
International Conference on High Speed Machining (HSM) <11, 2014, Prague>
Conference Paper
Fraunhofer IWU ()
machine tools; active vibration isolation; electro-hydraulic actuator

This paper presents the dynamic modelling of a novel electro-hydraulic actuator that decouples, attenuates and isolates ground motion to keep dynamic excitations transmitted to machine tools below permissible levels. Closed-loop dynamics are formulated by considering the hydraulic system dynamics as well as the dynamics of the actuator and machine tool. Controlled closed-loop transmissibility shows the actuator to have excellent attenuation of ground vibrations for excitation frequencies of up to 30 Hz. Numerical investigations representative of typical floor vibration levels experienced by machine tools demonstrate that the device isolates ground motion by up to 80%.