Electro-hydraulic differential cylinder drives with variable-speed displacement units as their central transmission element are subject to an increasing focus in both industry and academia. A main reason is the potential for substantial efficiency increases due avoidance of throttling flows. Research contributions have mainly been focusing on appropriate compensation volume asymmetry developmen...

In this paper, a new solution for an electro-hydraulic servo drive is proposed, which consists of two drives: one with hydraulic cylinder and rotary motor. the proposed drive, linear actuator attached to horizontal base motor mounted on piston rod. Thus, output signal lifting lowering element suspended rope. The paper describes structure, kinematics, dynamics, control novel drive. A valve propo...

Wear and tear are usually caused by various factors, which reduce the life span of a mechanical part. In control engineering an Electrohydraulic actuator system, wear can be system or controller itself. This article examines chattering effect that occurs during sliding mode (SMC) design, its on nonlinear electrohydraulic (EHA) system. To examine phenomenon, signum function is first applied swit...

In the last decades, digital hydraulics has emerged as a new alternative for development of more efficient hydraulic systems, where effects throttling losses and internal leakages are minimized through use conventional components associated in parallel or switching hydraulics. aviation industry, systems commonly applied to control highly relevant such landing gear flight surfaces. this context,...

The rehabilitation exoskeleton is an effective piece of equipment for stroke patients and the aged. However, this complex human–robot system incurs many problems, such as modeling uncertainties, unknown interaction, external disturbance, actuator fault. This paper addresses adaptive fault-tolerant tracking control a lower limb joint driven by electro-hydraulic (EHA). First, model built consider...

As the aviation industry evolves toward nextgeneration fly-by-wire vehicles, hydraulic and electrohydrostatic actuators (EHA) are replaced with their electro-mechanical counterparts. By eliminating fluid leakage problems while reducing weight and enhancing vehicle control, the feasibility of electromechanical actuators (EMA) in avionic applications has been established. However, due to the inhe...

Magnetostriction is the change in shape of materials under the influence of an external magnetic field. The cause of magnetostriction change in length is the result of the rotation of small magnetic domains. This rotation and re-orientation causes internal strains in the material structure. The strains in the structure lead to the stretching (in the case of positive magnetostriction) of the mat...

Detailed knowledge of actuator properties is a prerequisite for advanced manipulator design and control. This paper deals with the experimental identification and modelling of the nonlinear dynamics of a high performance hydraulic actuator. Such actuators are of interest for applications which require both high power and high bandwidth. An analytical model of the system is formulated, and a sof...