Compensator Designed for Electro-Hydraulic Servo System in Laminar State

Abstract

The study researched the orifice flow equation when the flow state of the orifice is laminar. Based on the novel flow equation and the expected linear flow equation, a compensator is designed to compensate the non-linearity and make the flow characteristics linear. The characteris-tics experiment result shows that the flow after compensa-tion control is close to the expected flow, in which the pres-sure difference was increased from 0.5MPa to 4MPa, and the error is less than 20%. When the compensator is used as feed forward control in the EHSS and compound with proportional (P) control, the sinusoidal response error with frequency of 0.5Hz and amplitude of 5mm is within 0.4mm under large external load. While the error of the uncompensated system is up to 0.8mm. The compensator can be used into the electro-hydraulic system with larger load disturbance and improve the control performance compounded with the simplest proportional (P) controller.