Dynamic synchronization analysis of dual eccentric shafts driven by parallel hydraulic motors

Mechanical devices with eccentric shaft synchronization are extensively employed in engineering applications, such as exploration, pile driving, rock breaking, and material selection. In this work, a dynamic model of two eccentric shafts was established to study their synchronization characteristics in a parallel hydraulic motor system. The flow characteristics of two parallel hydraulic motors were considered for nonidentical parameters of the shafts. Our simulation results show that two eccentric shafts can sequentially reach a steady state despite their different parameters. However, their rotational velocities are unequal in the steady state. Further, the viscous damping coefficient more severely influences the synchronization characteristics of the shafts than mass and eccentricity. Finally, we show that the numerical and simulation results are supported by the experimental findings.