Structure Design And Performance Study Of A Two-stageradial Flow Magnetorheological Valve

Generally, traditional hydraulic valve structure which achieve effective control of the hydraulic system pressure and flow rate is based on the relative motion of the valve core and valve body mechanical components. And this working principle and characteristics of the hydraulic valve make it complex, high precision of parts machining and assembly, slow response, low reliability and difficult to control. However, the emergence of the magnetorheological(MR) valve which transmission medium is the smart material magnetorheological fluid(MRF) is effective in improving these deficiencies. At present, a lot of MR valve structure design is axially ring style and adjustable pressure range is not wide, so this paper proposes a two-stage radial flow MR valve. Under the magnetic field, the flow path of MR valve is four radial damping channel. Compared with the single stage radial flow structure, it effectively doubled the length of the damping channels in principle. In addition, compared with axial ring type structure, it can effectively improve the utilization rate of the magnetic field and increase the system pressure drop.The main research tasks in this article include:1. A two-stage radial flow MR valve was presented; its flow path consists of three segments orifice flow, two segments annular flow and four segments radial flow; the structure of the basic principle was put forward. Initial structure parameter defined values were given, then according to the initial parameter values the magnetic circuit calculation and verification were implemented. Damping gap of the two-stage radial flow MR valve was classified, and it then was divided specifically in accordance with the source of sticky-induced pressure drop and magnetic-induced pressure drop. Based on the classification, pressure drop calculation formula of the corresponding region type was deduced, and the final total pressure drop calculation formula was sort out.2. Using the ANSYS finite element simulation analysis software, modeling and simulation analysis of the two-stage radial flow MR valve has been carried on by EMAG module. The corresponding defined path was established, in which the magnetic flux density and the magnetic field lines distribution of the entire model was observed. And the finite element method(FEM) was used to optimize the initial structure design, then the final structure size was determined. Finally the contrast analysis has been carried on.3. The Gambit software was used to generate the corresponding analysis file. Then, the Fluent software was used to establish flow field definitions and to solve the calculation. Some analysis verification was made including the velocity, pressure drop and flow state of the two-stage radial flow MR valve.4.The Lab VIEW programming software was used to realize the data acquisition requirements, and a experiment platform was set up for the MR valve performance test. What’s more, in regard to pressure drop characteristics and differential pressure response characteristic of the two-stage radial flow MR valve, test and analysis has been carried on. According to the experimental results, its rationality, accuracy, theoretical design and analysis results were compared and validated.