During the operation of valve-controlled cylinder position systems, there are some problems, such as uncertainty and time-varying system parameters, imprecise modeling, external interference. These problems will affect loading accuracy safety reliability electro-hydraulic servo system. This paper used a research object, mathematical model was established. Then, sliding mode variable structure c...

Problem statement: While classical PID controllers are sensitive to variations in the system parameters, Fuzzy controllers do not need precise information about the system variables in order to be effective. However, PID controllers are better able to control and minimize the steady state error of the system. To enhance the controller performance, hybridization of these two controller structure...

This paper presents a new ultrasonic servo control drive for electro discharge texturing system industrial applications. The new drive is aiming to overcome the current teething issues of the existing electro discharge texturing system, servo control drive level of precision, processing stability, dynamic response and surface profile of the machined products. The new ultrasonic servo control dr...

The dead-zone is one of the most common hard nonlinearities in industrial actuators and its presence may drastically compromise control systems stability and performance. Due to the possibility to express specialist knowledge in an algorithmic manner, fuzzy logic has been largely employed in the last decades to both control and identification of uncertain dynamical systems. In spite of the simp...

A position-based impedance controller is proposed and demonstrated on an existing hydraulic press with a two-way vertically mounted hydraulic cylinder driven by a servo-solenoid valve. A proportional-integral-derivative (PID) controller and a Fuzzy Logic Controller (FLC) are primarily developed to meet the accurate positioning requirements of the impedance control formulation. The impedance fil...

The extended state observer (ESO) has been widely used in the and perturbation estimation of electro-hydraulic servo system. It was found that there a controlled quantity transfer function between value disturbance. This indicates traditional linear ESO’s disturbance is affected by change control input. To solve this problem, new structure ESO for hydraulic system (LHYESO) designed introducing ...

In the valve opening control of spacecraft, electro-hydraulic servo position-controlled loading is generally adopted. The nonlinear factors and uncertain interference in system will affect accuracy. order to improve tracking accuracy response speed, model dual-channel valve-controlled symmetrical cylinder position was established. A disturbance observer used estimate unmodeled disturbances syst...

A valve-controlled hydraulic cylinder system has the characteristics of uncertainty and time-variance, electro-hydraulic servo unit encounters shock, vibration, other external interference when working, which seriously affect stability system. Therefore, it is necessary to introduce an active disturbance rejection controller (ADRC) into control. However, there are many ADRC parameters, difficul...