The Designing And Experimental Research Of The Cylinder-Shape ER-Valve

The valve is one kind of components which can realize the fluids impediment, passing and throttling control. The way that adopting tradition hydraulic valve to control the piezoelectric fluids pump to realize step-by-step precise drives of terminal actuating mechanism has many disadvantages, such as lag response of cone-way valves, flow backwards, low capacity of resolving power of piezoelectric pump and so on. In this dissertation, the ERF (electrorheological fluid) valve replaces traditional hydraulic valve to realize step-by-step drives of fluid hydraulic pressure, which is with high frequency and high flow resolving power, without lag, flow backwards and so on. ER-valve is analyzed from the theoretical and experimental aspects.The development trends of ER technology is summarized firstly in the paper, then compare the ERF (electrorheological fluid) valve and traditional hydraulic valve .ER-valve can overcome many defects of traditional hydraulic valve, and applications of ER-valve in hydraulic pressure technology is prove.The basic knowledge of ERF is summarized, involving composition of ERF, as well as its adaptability to a project. And then mechanism of ER effect, electrical expression of ER effect and Influencing Factors(involving magnitude of electric field, frequency of electric field, suspended particles, dispersed medium, mechanical properties, temperature, additive and so on) of ER effect are expatiate particularly.Adaptability of ER effect to a project is summarized briefly, as well as the pattern.And then a brief introduce is made, about frondose appliance of extrusion pattern, cutting pattern, and flow pattern.Principle of ER-valve is intrduced in the third chapter. Pressure factors which influence fluid inside ER-valve are analyzed specially in the third, forth and fifth part of this chapter.There are two kinds of factors: the first is pressure gap produced by fixed the cracks of cylinder; the second is pressure gap produced by ERF's yield stress from ER effect.Then equation about the flux of ERF in the annular gap is founded, as well as equation of the fluid movement when ERF is being effected by electric field.Then upbuilded the connection of ER valve-bridge, and derived the ER valve's dynamical equation, achieving the positive-reverse driving of terminal actuating mechanism.Finaly, the control of the ER-valve is introduced. closed loop is selected to control the ER-valve, deducing the pressure flow equation through hydraulic pressure chart controlled by valve and dynamic equilibrium equation of Hydraulic cylinder piston, as well as the continuity flow equation.Then is building the controlling model, deducing closed loop transferring equation. with electric field E input and pressure PL exported.And the next step is designing and making sample machine with the canister shape of parallel connection made up of single flow channel circle, multi-flow channel circle, based on the need of the ER-valve technology. And using the finite element method, also analyzing rationality of the structure.Then building the experiment platform for ER-valve, confecting ERF and analyzing its performance. And making a brief explanation according to the working environment of ER-valve and choices of material in this environment, also having a guarantee of leak-proof quality and insulating property.The next is using the software of Fluent to make a theory modeling analysis and simulation analysis. Based on the relationship of the pressure, flow and electric field of the ER-valve with single flow channel circle, multi-flow channel circle. The conclusion follows:1) Without electric field, the smaller the clearance of the valve is, the higher the pressure gap is.2) Considering the three different valve flow clearances, when pressure gap is amplified as a result of the amplified electric field, the smaller the clearance is, the higher range the pressure gap amplifies. 3) As the flow amplifies, the pressure gap amplifies.4) Deducing that under the same flow, the bigger the valve flow channel is, the smaller the pressure gap is, through relationship curves contrast of the ER-valve pressure and flow.5) Deducing that the pressure gap of the multi-flow channel valve is smaller than single flow channel valve's.In the fifth chapter, the ERF is confected with granule density is 30% and the experiment platform for ER-valve is built. And also studying the influence to the ER-valve working ability produced by the different electrode structure, these different structure parameter involving the electrode quantity, the electrode diameter, cylinder clearance and so on. The conclusion follows:1) When the quantity of the ER-valve cores increases, the two sides pressure gap of the ER-valve drop, but the ability of load enduring goes up.2) When the . diameter of the ER-valve amplifies, the two sides pressure gaps fall, but the ability of load enduring goes up.3) When the flow clearance of ER-valve increases in a certainty range, the ability of moment hydraulic pressure enduring falls as well as the two sides pressure gaps of the valve.The influences produced by the acreage size of the ER-valve to the driving ability of the drivers is studied, the static hydraulic pressure enduring ability and the ability of moment hydraulic pressure enduring under high speed flow are studied too, as well as the characteristic of hydraulic pressure enduring intension under parallel combination electric flow.