Influence of Compressibility of Oil on the Step Response of Hydraulic Servomechanism 1st Report Basic Equations and Responses under Simple Loads

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A step response of hydraulic servomechanism under influence of compressibility of oil is studied. Firstly basic equations for a closed loop system under a general loading condition are studied. Secondly time dependent variation of pressure in the system and displacement with no-load condition are studied. An exact solution in an analytical form is given for this case. The compressibility of oil considerably influences pressures in the system, wheras its influence on the displacement response is small. The response under constant loading force is similar to the response without loading. When a few parameters are transformed suitably, the response with constant load or the Coulomb friction coincides with the response of the no-load system
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