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In order to give full play to the performance of electro hydraulic force servo system in engineering applications, especially its good dynamic performance, the electro hydraulic force servo system and its bond graph model built process are analyzed. In this course, aiming at the time varying nonlinear characteristics of the hydraulic cylinder cavity with the displacement of the piston rod, the nonlinear characteristics of friction in the system such as spool friction and cylinder piston friction, valve orifice flow nonlinearity etc. these actual existence difficult building model characteristic in theoretical research and practical application, we play the advantage of bond graph theory that can contain multiple nonlinearities, that is applied to the simulation of nonlinear systems, and that can be used to establish the system model based on the direction of power flow in the system. Then the bond graph model of electro hydraulic force servo system is established, and the correctness of the new model is verified by simulation research, this study also has a good reference for other related research. Keywords-electro hydraulic force servo system; time variant nonlinear cavity; spool friction; cylinder piston friction; valve orifice flow nonlinearity; bond graph model

Study on Electro Hydraulic Force Servo System Considering Spool Friction and Cylinder Piston Friction Nonlinear