A novel electro-hydrostatic asymmetric actuator with double displacement hydraulic pump

Due to asymmetry of the piston effective area on both sides of the single rod cylinder, its performances are limited compared to the double rod cylinder In this paper, a novel electro-hydrostatic asymmetric actuator is proposed, in which double displacement pump is used to control the single rod actuator to improve system properties. The double displacement pump possesses two states, large displacement and small displacement, which respectively control rod less chamber and rod chamber. Mathematical and simulation models are constructed to analyze internal parameters of system. By analyzing force load curve, in case of no increase in maximum torque, rotating speed is reducing, that means power rating is lower. Furthermore amplitude-frequency and phase-frequency characteristics are enhanced. Effectiveness and availability of the design is authenticated.