| The electro-hydraulic servovalve is a servo control system's core component. Because the electro-hydraulic servovalve plays an extremely important role in control system, so the performance simulation analysis of an electro-hydraulic servovalve to guarantee its performance characteristics, to guarantee control system has good stability and fast responsibility, which has a significance meaning.The three-dimensional flow field simplified model of the nozzle-flapper of a double nozzle-flapper servovalve was established and did numerical simulation. The static characteristics of the nozzle-flapper were studied, and the three-dimensional flow field distribution characteristics of the nozzle-flapper under different inlet pressure and different distances between the nozzle and flapper were obtained. The study provides a reference for the double nozzle-flapper servovalve's design and its structural optimization.The three-dimensional flow field simplified model of the jet-pipe amplifier of a jet-pipe servovalve was established and did numerical simulation. The static characteristics of the jet-pipe amplifier were studied, and the zero accepted pressure under different accept distance and the recovery pressure under different deflection distances were obtained, the mathematic model of the recovery pressure was established by using polynomial fit method. The study provides a reference for the jet-pipe servovalve's design, optimization and construct its overall mathematical model.The dynamic model of a double nozzle-flapper servovalve was established and did dynamic characteristic simulation. The modeling method of the double nozzle-flapper servovalve was studied, and then the pressure curve, flow curve, leakage and dynamic response characteristic curves were obtained. The study lays a foundation for hydraulic control system's modeling, design and optimization.
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