Reduction of axial piston pump pressure ripple

The reduction in source flow ripple in hydraulic systems is the most effect ive method of reducing pump-generated pressure ripple and system noise. Thi s paper describes reductions in axial-piston pump delivery flow ripple achi eved using a novel timing mechanism which is inherently speed, flow and pre ssure sensing. Fixed-speed tests have shown that the mechanism can significantly reduce ax ial-piston pump delivery flow ripple over a wide range of delivery pressure s and pump displacements. Furthermore, the reduction in pressure ripple ach ieved with the mechanism has been shown to contribute towards reductions in overall air-borne noise levels of up to 6 dB in a simple system. A simulation model has been produced to predict the behaviour of the protot ype mechanism. The model has been compared with the measured delivery flow ripple and achieves good agreement.