Frequency Characteristics of Hydraulic Motor Controlled with spool Valve

概要

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Frequency characteristics of fundamental hydraulic circuits which were composed of a hydraulic motor and a spool valve were studied. Analyses were carried out on : (i) a linear method, (ii) an approximate method using a non-linear equation with non-linear characteristics of the spool valve taken into account, (iii) the case where angular acceleration was neglected because of the slow rotation of the hydraulic motor and (iv) a numerical solution for the non-linear equation ; and the calculated results were compared with the experimental results. It was pointed out that the test results showed good agreement with the analytical solution of the linearized equation with respect to amplitude and phase of the hydraulic motor, whereas the average angular velocity of the motor decreased with an increasing frequency of the spool valve under the influence of higher harmonics caused by non-linearity of the spool valve.
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