Theoretical background of hydraulic drive control system analysis for testing piston hydraulic cylinders

Digital Control Systems for Synchronizing Hydraulic Servo Cylinders

This paper presents the theoretical and experimental researches performed by the authors in order to design a digital control system for electrohydraulic servomotors. The system contains a digital control module and two position servomechanisms. A mathematical approach was developed for obtaining a mathematical model describing the whole control system. The dynamic performance of this system wa...

The control of an opposed hydraulic free piston engine

An opposed hydraulic free piston engine is under design at the Tianjin University in China because of the advantages of this engine compared to the conventional engine. The main challenges presented by such engines are the control of the piston motion and synchronization. This study investigates the fundamental control context and control method of the opposed hydraulic free piston engine using...

Direct Driven Hydraulic Drive

Hydraulic systems are widely used in industry because of the advantages of their small size-to-power ratios and their ability to produce very large linear force and torque. There are tendencies for compact electro-hydraulic systems which deliver powerful, linear movement having hydraulic oil circulation only when operating. This paper investigates directly driven hydraulic setup for non-road mo...

Velocity Control of Electro Hydraulic Servo System by Tracking Method

This paper proposes an efficient Tracking method for velocity control of an electro-hydraulic servo system (EHSS) in the presence of flow nonlinearities and internal friction. The tracking method controller is a kind of feedback error learning structure. In the proposed method, the Feedback Error Learning (FEL) algorithm is used to control the velocity. There is no need to compute the system ja...

Hydraulic conductivity measurment for subsurface drainage system