Tests, using the ‘secondary source’ method, have been performed to measure the fluid-borne noise characteristics of several hydraulic pumps. This method has proved to give very repeatable measurements of source flow ripple and source impedance, and the results show good qualitative agreement with theoretical models. Results are verified by using them to predict the pressure ripple in a typical hydraulic circuit and comparing this with measured pressure ripple. Correlation is shown to be good.
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