Modeling of electro-hydrostatic actuator considering the factors affecting performance and its comparison with SimHydraulic modeling

Hydraulic actuators play an important role in advanced industrial. The automation industry is also widely used electromechanical actuators. Electro-hydrostatic actuators are technology that provide advantage of electromechanical and electro-hydraulic actuators and cover flaws of them. In this paper, first of all, the structure of electro-hydrostatic actuator is described, then the presented models are examined. In the physical behavior, a complete model of electro-hydrostatic actuator is presented. The proposed model includes all factors that affect performance, such as pressure drop between cylinder and pump, nonlinear friction of electrical motor, nonlinear friction between cylinder and piston and inner circuit (include accumulator and check valves). Modeling the impact of factors affecting the performance of the actuator output such as piston rod position, differential pressure between cylinder ports and the force generated by actuator are studied. Finally behavior of proposed model is evaluated by a model that modeled with multiplicity method by Matlab-Simulink-SimHydraulic toolbox.