Coupling Synchronization Criterion of Two Hydraulic Motors in an Eccentric Rotary Vibration Machine

Figure 1

New vibration piling hammer-soil model. (1), (2) Eccentric blocks 1 and 2. (3) Pile hammer body. (4) Foundation soil’s flexibility. (5) Foundation soil’s damping. (6), (7) Hydraulic motors 6 and 7. (8), (9) Electrohydraulic proportional valves 8 and 9.