Applied Research On The Multi-Nozzle-Flapper Valve Based On GMM

Electro-hydraulic servo valve was treated as core component in the servo control system ofaviation and aerospace industry, whose frequency response, accuracy, and reliability directly restrictedthe performance of the servo system. At present, the nozzle-flapper type of electro-hydraulic servovalve was widely used in the industry of aviation and aerospace, which is the key determinant instructure, precision, reliability and other performance. As is known to all, the conventionalnozzle-flapper type of servo valve was driven by a solenoid motor, but it exists low precision, smalloutput force, a lag response time and other shortcomings, which can not meet the industry desire suchas precision position control, aerospace and military field which has the requirements of high-speedelectro-hydraulic servo system. In recent years, abroad and at home, with new functional materialsespecially on GMM (Giant Magnetostrictive Material) based electric-mechanical converter researchand development, thus new means to improve the frequency and accuracy of electro-hydraulic servovalve were supplied.In this paper, the composition and working principle of multi-nozzle flapper valve based on GMMwas described in detail, the basic structure parameters were designed and calculated, and deduced itspressure-flow characteristic equation, thus established the design principles of these parameters.According to the actual structure of giant magnetostrictive actuator, the physical model which describegiant magnetostrictive actuator’s magnetic-mechanical coupling process was built and simulated byAMESim, and the influences of involved structural parameters on the dynamics of the actuator and themulti-nozzle flapper valve are analyzed, which further gives the design criterion of the multi-nozzleflapper valve based on GMM; Using the toolbox of GUI in MATLAB software, Completed thestructure and parameters design of the actuator and multi-nozzle flapper valve, finished the simulationof related properties, thus avoided the tedious mathematical modeling and achieved an efficient designand optimization of multi-nozzle flapper valve based on GMM; By CFD numerical simulation, themain structural parameters of the multi-nozzle flapper valve were optimized designed, and bycomparing with the simulation results of AMESim and theoretical results, which verified the accuracyof the CFD modeling and given the design criterion of the multi-nozzle flapper valve based on GMMagain; The prototype of multi-nozzle flapper valve based on GMM was developed, the experimentresult has proofed that the multi-nozzle flapper valve based on GMM has wide pressure controlproperty which is up to1.0MPa, fast response speed with rising time less than2.5ms. And theoreticalbasis is presented to further apply the multi-nozzle flapper valve based on GMM to two-stage or multi-stage electro-hydraulic servo valve.