Investigation of Dynamic Characteristics of the Hydraulic Drive with Proportional Control

AbstractThe dynamic characteristics of hydraulic drive with proportional control are investigated by experimental and modeling approaches. The article presents research on linear motion drive based on hydraulic cylinder with electrical position feedback. The mathematical drive model is developed taking into account the characteristics of pump station, hydraulic cylinder, inertial load, dynamic characteristic of proportional valve, and electrical position feedback. The proportional valve characteristic is determined based on experimental static flow characteristics and transfer function of spool displacement on input current. Bode diagram for displacement of cylinder is obtained experimentally and by modeling for frequencies of 0.05 to 5Hz. It is shown that for frequencies of up to 3Hz, the proposed model provides a 3% accuracy