Abstract: A high-power inertial vibration machine-hydraulic vibratory pile hammer is taken as the object, and mechanical-electrical-hydraulic coupling dynamics theory is used to study the self-synchronization characteristics problem of eccentric gyration system controlled by hydraulic driving. A mechanical-electrical-hydraulic coupling model of inertial vibration machine synchronization system without phase difference monitoring is established. Simulation study on this model is carried out, and the effects of various factors, such as friction torque, dynamic stiffness, dynamic damping, exciter structure parameters and hydraulic motor leakage, on the stable working and transition processes of self-synchronization system. Modeling and simulation results show that there are interactions and complex coupling relationships among the above-mentioned factors and between the factors and the body of vibration machine. The synchronization effect can be improved by amending damping, stiffness, leakage coefficient and exciter structure parameters, etc. Among them, the effects of regulations of stiffness and leakage coefficient are most obvious. Research shows that the modeling and simulation correctly reflect the influences of the said factors and the coupling relations between the factors and body of vibration machine, which has a theoretical guiding significance to the optimized design of mechanical-electrical- hydraulic system of the hydraulic-driven vibration machine.

Key words: Eccentric gyration vibration machine, Hydraulic vibratory pile driver, Hydraulic-driven control, Self-synchronization