Research On The Water Hydraulic Digital Proportional Valve

This dissertation presents a water hydraulic digital proportional valve that is pilotcontrolled. By adopting PCM technology, a kind of pulse code modulation, it can manipulatethe motion of the underwater tools.Hydraulic resistance network of the pilot valve is researched by mathematical modelingand theoretical analysis. Based on the quantitative relation analyzed in the dissertation amongthe pressure at the control orifice, the version and the parameters of the hydraulic resistancenetwork, reasonable choice of the three are made. The model and the parameters of the mainvalve are provided by establishing the force balance equation and analyzing the pressure-flowcharacteristics.Using the software AMEsim to model and simulate the valve, the curve and the maininfluencing factors of the dynamic response are obtained. By that analysis, the rationalstructural parameters can be designed.The amplify machinery which plays a crucial role in the dynamic response of the pilotvalve is intensively researched. Basic features of the piezoelectric actuator is analyzed andfollowed by economical and applicative selection of piezoelectric drive power and controlpanel. The discharge circuit module is thus designed. The structure version and the effects ofparameters on the rigidity of the compliant mechanism are researched and the magnificationsof different physical dimension are numerically analyzed by ANSYS. By doing that, rationalstructure version and parameters of the compliant mechanism are obtained.The prototype was made and the experiments of the pressure, flow control characteristicsand the pressure dynamic response were performed. The results show that the prototypeperformed well in the characteristics tested. Pressure, flow control characteristics agree withthe analyzed results. Affected by experimental and processing conditions as well as thedischarging circuit, pressure dynamic response characteristics have a little deviation with thenumerical analysis results. The static and dynamic characteristics will basically meet thedesigning demand so that the valve has good research value and application prospects.