Abstract
Pressure and flow ripples of a variable displacement vane pump with a pressure compensator were theoretically analyzed by numerical calculations. The variations of the leakages were clarified in a detail. It was proved that the apparent leakages due to a fluid compressibility affect definitely the ripples of pressure and flow of both compression and expansion processes of a confined displacement chamber, and that the time-variation curve of the pressure and the bulk modulus in the chamber are dominant factors.
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