Abstract
Electrohydraulic servovalve play a major role in many feedback control systems. They find applications in CNC machine tools, aircraft, remote controlled mechanisms and all kinds of of high and mobile applications. The analyzed servovalve uses a nozzle and receiver holes to generate a differential pressure which is then used to move precision spool valve incorporating some type of feedback device. Hence, if the nozzle movement can be controlled in some way, preferably by a low power electrical signal, then the resulting device would seem to offer the ideal interface between low-power electronics and high power output hydraulics. The performance of the valve depends on many parameters. An attempt has been made to study the steady-state operation of a jet pipe flow control servovalve using nite Element Analysis (FEA) and theoretical method. Jet pipe servovalve have two main assemblies; the torque motor (first stage) and the valve assembly (second stage). Between the first and second stages, the feedback spring is connected to stabilize the servovalve operation. Solid modeling is a prerequisite for this analysis. Solid model of the servovalve was developed using SDRC IDEAS software. The finite element formulation of the desired component assemble consisting of the torque motor armature, armature bush, flexure tube, jet pipe, jet pipe nozzle, second stage feedback spring was subsequently carried out and simulated with appropriate boundary conditions. From the FEA it is possible to predict the jet pipe deflection, armature rotation as well as spool displacement for a given torque input at the armature.
