Principle and Method to Improve the Dynamic Stiffness of the Electro-hydraulic Servo System
نویسنده
چکیده
The conception of raising dynamic stiffness of electro hydraulic position servo system by flow feedforward compensation is put forward. First, the elementary principle of maintaining piston position unchanged under sudden external force load change by charging additional oil volume is analyzed. Then, a scheme using double servo valves to realize flow feedforward compensation is presented, in which another servo valve is adopted specially to compensate the compressed oil volume in time. The two valves are arranged in parallel to control the cylinder jointly. Furthermore, the model of the flow feedforward compensation is derived, which is the key technique of this scheme. Using co-simulation of AMESim and Simulink, simulations are conducted under sudden external load force. And the results show that system dynamic load stiffness is improved with decreased maximal dynamic position deviation and shorted settling time.
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