Fluid Borne Pressure Ripple in Positive Displacement Pump Suction Lines

Reference:

Edge, K. A. and Freitas, F., 1981. Fluid Borne Pressure Ripple in Positive Displacement Pump Suction Lines. In: Proceedings - Relay Conference, 1981-01-01, Cambridge, Engl.

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Abstract

In a previous publication, it was shown that pressure ripple levels in a hydraulic system depend on the flow ripple generated by the pump and the impedance characteristics of both the pump and the system. These pressure fluctuations can create structural vibration and hence lead to air-borne noise. In this paper it is shown that similar effects can occur in the suction line of a pump. The pressure ripple levels may be as high as those measured in some delivery lines. Tests have been performed on an axial piston pump boost system in order to examine the effects of mean pressure and system configuration on pressure ripple levels. Wave propagation theory has been employed to examine the behavior of pressure ripple generation in boost systems, and close agreement between experimental results and theory has been obtained. It has been possible to quantify the flow ripple and impedance spectra of a piston pump at its inlet port. Preliminary tests on unboosted systems have shown that pressure ripple effects can induce either air release or cavitation and some typical results are presented

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