Research Of Water Hydraulic Servo Control Valve Driven By Diphase Oppositing Giant Magnetostrictive Actuator

Water hydraulic servo control technology as an important research direction in the field of water hydraulics has been developing rapidly over the past decade. Furthermore, water hydraulic servo valve is the critical component of hydraulic servo control system, and its performance affects the characteristics of the whole system directly. Based on the excellent performance of GMM, a new kind of diphase oppositing giant magnetostrictive self-sensing actuator is put forward. Its working mechanism and application features used in water hydraulic servo control component is researched with hydraulic servo control technology. The structure design, performance parameters metch and experimental study of water hydraulic servo control valve which are suited with the GMM self-sensing actuator are carried out.The design and research of diphase oppositing giant magnetostrictive self-sensing actuator are carried out. Based on the structure and mechanical analysis of GMM self-sensing actuator, spring tube and slide valve, the design method of output force and displacement of GMM self-sensing actuator is built. The design of diphase oppositing giant magnetostrictive self-sensing actuator is completed and the locking and adjustment device of prestress used in the GMM self-sensing actuator is researched based on the magnetostrictive effect and prestress effect of GMM. The design theory and method of diphase oppositing giant magnetostrictive self-sensing actuator is put forward.Because of the new structure characteristics of the diphase oppositing giant magnetostrictive self-sensing actuator, the force and displacement output characteristics and the vibration mode of the self-sensing actuator have been researched by the static and dynamic analysis of this actuator using ANSYS. The stiffness calculation method of feedback pole and its influence to the displacement of slide valve are analyzed by simulation of ANSYS. The relation of the displacement of the self-sensing actuator with pressure at both sides of slide valve and displacement of valve spool has been analyzed, and the relation of the displacement of the slide valve and the stiffness of the feedback pole also has been researched. The design method of feedback pole in water hydraulic servo valve has been determined.Based on the hydrostatic bearing theory, the design method of hydrostatic bearing structure in water hydraulic slide valve is studied. The static characteristics of slide valve in water hydraulic servo valve which uses hydrostatic bearing structure is put forwand by the simulation analysis. The flow-pressure characteristic equation and pressure characteristic equation of the water hydraulic servo valve are built by using hydraulic resistance theory and introducing hydrostatic bearing structure coefficient and annular gap-nozzle structure coefficient. By the research of the best structure coefficient of hydrostatic bearing structure and the optimal control pressure characteristics, the equation of hydrostatic bearing structure in slide valve is built and the specific design method of hydrostatic bearing structure is put forward. The design method of deep-sea pressure balance device used for water hydraulic servo valve is put forward.The best manufacturing precision, assembly precision and processing method are put forward by analyzing the material properties, manufacturing and assembly process of the critical parts in water hydraulic servo control valve and the method of guaranteeing the precision of servo valve including grouping, grind in, press mounting. The prototypes of secondary force feedback water hydraulic servo valve and direct force feedback water hydraulic servo valve are developed. The test of static characteristics of the new water hydraulic servo control valve is carried out based on the performance test equipment and test system. Furthermore, the performance test technology and method of water hydraulic servo control valve are put forward.