径向流及圆环流磁流变阀结构设计与压降性能分析

发布时间：2018-06-30 00:03

本文选题：磁流变阀 + 径向流　；参考：《华东交通大学》2015年硕士论文

【摘要】：传统的液压控制阀一般由可移动的阀芯机械部件及固定不动的阀体部件之间的相对运动来实现对液压系统的压力和流量控制。由于阀体内存在可移动的机械部件，导致液压阀的结构复杂，，零部件的加工精度要求较高，而且还存在移动部件运动不易控制，工作可靠性低等难题。自从磁流变液智能流体材料的出现，以其为工作介质的磁流变控制阀有效的解决了这些不足。磁流变阀是一种无相对移动部件，以智能流体磁流变液的流变特性为控制原理设计的智能器件。传统的磁流变阀阀芯和阀体之间的阻尼通道为圆环流动结构，本文提出了一种新型的径向流磁流变阀结构；同时在工作间隙和磁场特性相同的情况下，分析比较两种不同流动走向的磁流变阀的性能。本文主要内容包括： 1、设计了一种径向流磁流变阀，阐述了在设计过程中的一些关键技术和关键问题，按照设计要求初步选定了磁流变阀的关键尺寸，然后对其进行磁路计算，对所设计阀的关键尺寸进行校核，确定所需的线圈匝数。同时，在保证磁场条件不变的情况下，设计了一种线圈匝数和阻尼间隙大小都相同的圆环流磁流变阀结构，并进行了磁路计算及相关分析，验证其结构可行性。 2、分析了径向流及圆环流两种典型磁流变阀的压降特性，建立了两种不同流向的磁流变阀压降数学模型，并进行了压降推导计算分析。 3、利用ANSYS有限元分析软件中的EMAG模块，分别对径向流和圆环流磁流变阀磁路进行仿真分析。通过仿真中结构的磁力线分布，首先确定结构的可行性，然后对比两种结构在电磁场仿真下的压降大小，比较不同阻尼间隙走向的压降性能。 4、采用Fluent流体仿真软件分析径向流及圆环流磁流变阀的压降及速度变化规律，并与电磁场仿真的压降性能进行对比分析，进一步解释了流道结构对磁流变阀压降的影响。 5、采用LabVIEW测试软件搭建了磁流变阀动态性能实验系统，对径向流和圆环流磁流变阀的压降特性进行了测试分析。分析了不同负载和不同激励电流下两种磁流变阀压降的变化规律，并与电磁场仿真和磁流体仿真结果进行了对比分析。
[Abstract]:The traditional hydraulic control valve usually realizes the pressure and flow control of the hydraulic system by the relative motion between the movable spool mechanical parts and the fixed valve body parts. Because there are movable mechanical parts in the valve body, the structure of the hydraulic valve is complicated, the machining precision of the parts is high, and the movement of the moving parts is difficult to control and the working reliability is low. Since the emergence of the magnetorheological fluid intelligent fluid material, the magnetorheological control valve with the magnetorheological fluid as the working medium has effectively solved these shortcomings. Magnetorheological valve (MRV) is a kind of intelligent device which has no relative moving parts and is designed based on the control principle of the rheological characteristics of the intelligent fluid magnetorheological fluid. The damping passage between the valve core and the valve body of the traditional MRF valve is a circular flow structure. In this paper, a new type of radial flow MRF valve structure is proposed, and at the same time, when the working gap and magnetic field characteristics are the same, The performances of two kinds of magnetorheological valves with different flow patterns were analyzed and compared. The main contents of this paper are as follows: 1. A radial flow magnetorheological valve is designed. Some key technologies and key problems in the design process are described. The key dimensions of the MRV are preliminarily selected according to the design requirements. Then the magnetic circuit is calculated and the key dimensions of the designed valve are checked to determine the number of coils. At the same time, under the condition that the magnetic field condition is invariant, a structure of circular circulation magnetorheological valve with the same coil turns and damping gap is designed, and the magnetic circuit calculation and correlation analysis are carried out. 2. The pressure drop characteristics of two typical magnetorheological valves, radial flow and annular flow, are analyzed, and two mathematical models of MRV pressure drop with different flow directions are established. The pressure drop is calculated and analyzed. 3. Using the EMAG module of ANSYS finite element analysis software, the magnetic circuit of radial flow and annular flow magnetorheological valve is simulated and analyzed respectively. Through the distribution of the magnetic force line of the structure in the simulation, the feasibility of the structure is first determined, and then the pressure drop of the two structures under the electromagnetic field simulation is compared. The pressure drop performance of different damping gap trends is compared. 4. The pressure drop and velocity variation of radial flow and ring flow magnetorheological valve are analyzed by fluent fluid simulation software, and compared with the pressure drop performance of electromagnetic field simulation. The influence of flow channel structure on the pressure drop of MRV valve is further explained. 5. The dynamic performance experimental system of MRV valve is built by LabVIEW software. The pressure drop characteristics of MRV valve with radial flow and annular flow are tested and analyzed. The variation law of pressure drop of two kinds of MRV under different loads and different excitation currents is analyzed and compared with the results of electromagnetic field simulation and magnetofluid simulation.
【学位授予单位】：华东交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TH137.52

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