Predicting pump dynamics

The dynamic behavior of a Parker Hannifin/Abex NWL hydraulic-axial-piston pump was simulated to determine information on pump flow ripple for longer pump life and reduced noise.

Amajor concern with hydraulically powered systems is the noise levels created by alternating forces inside the pump as well as pump-generated flow ripple. In addition to noise, these pump effects shorten the lives of system components and can even cause system instability and breakdown. Researchers at Linkoping University in Sweden have developed a computer simulation model for Parker Hannifin Corp. at Abex NWL that investigates pump flow ripple, providing a wealth of useful information to pump designers.

Pumps generate flow ripple in both the suction and delivery lines, interacting with the hydraulic system and creating pressure ripple and noise. Additionally, the large alternating forces inside the pump cause vibration of its shell. These vibrations also generate noise and are a major contributor to the limitations of fatigue life in system components.