Research on Anti-disturbance and Simulation of Mechanical-hydraulic Servo Based on State Observer and Feedforward

In order to ensure the motion accuracy in hydraulic servo system,the exact static and dynamic stiffness should be required,that is,it has high motion accuracy.However,the load has serious effects on hydraulic servo system,as the disturbance signals are generally difficult to measure,the state observer can be applied to measure the load disturbance.Then,the observed load counterbalances the disturbance with the method of compensated feedforward,which can reduce the motion error caused by load disturbance.Aiming at the situations with observer participation or without,the theoretical analysis was conducted and the simulations with sudden load increase and sudden load decrease were operated.Both the theoretical research and the simulation results shown that this method is a good solution to improve the anti-interference ability of mechanical-hydraulic servo system.