Dynamic Performance of Pressure and Flow Rate in Oil Hydraulic Pipe Line with Vibrating Valve System : Influence of Nonlinear Characteristic of Valve

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In this paper, an oil hydraulic pipe line system terminated by a vibrating valve at one end and a constant pressure source at the other is discussed. The wave form of pressure pulsation and the mean flow rate of the system are calculated by an approximate method considering a nonlinear pressure-flow characteristic of the valve. In these systems, in spite of sinusoidal inputs of valve orifice areas, higher harmonics are generated and the mean flow rate is changed according to the frequency even if the mean valve orifice area and the mean pressure difference remain constant. Using a hydraulic pipe line-spool valve system, the pressure wave form and the mean flow rate are examined experimentally. And the results are compared with the calculating results. Agreement of both results is fairly good.
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