Effects of Non-Uniform Pistons Distribution on Axial Piston Pump Flow Ripple

The pressure ripple which causes vibration and noise of hydraulic systems are derived from the interaction of the high-frequency flow ripple of piston pumps and the resistance of hydraulic systems. Since an efficient method to reduce the vibration and noise can be started from the flow ripple of the piston pump. In this paper, a cylinder in which pistons distribute non-uniformly is come up to adjust the frequency component of the flow ripple. The geometrical vector method is utilized to analyze the kinematic flow rate of the non-uniform piston pump and the significant frequency component of the kinematic flow ripple moves to low frequency. A simulation model based on a single piston chamber is established and a complete non-uniform distribution piston pump model is integrated, then the reduction of the significant frequency component amplitude is validated by the simulation results. Some of the conclusions provide suitable guidance for the control of piston pumps flow ripple.