两种电流变控制阀流体动力控制性能比较研究

发布时间：2018-08-11 18:19

【摘要】：随着现代液压控制技术的发展,液压系统逐渐要求联合微机控制实现机电液一体化,且对控制精度和控制动态性能提出更高的要求,利用电流变技术能在电场直接作用下改变表观粘度以实现流量、压力的无级调节等优点,应用其原理的电流变控制阀将成为现代液压技术的一个研究方向。本文采用理论、仿真和实验相结合的研究方法,综合运用流体力学,数值计算方法等相关理论知识,在文献分析和已有研究成果基础上,深入分析电流变阀的控制原理,并对平行平板型电流变控制阀和同心圆柱型电流变控制阀进行结构设计,利用ANSYS对其结构强度和刚度进行验证、利用FLUENT软件对其内部流体动力控制对比分析,最后实验对比分析两种不同类型的电流变控制阀的流体动力控制性能。本文在S.S Zhu对电流变流体的动力传输控制的实验研究基础上,对两种不同类型的电流变控制阀的流体动力控制性能进行对比研究,主要研究工作和创新点如下: 第一、基于以往研究分析,从流体力学角度出发,将电流变流体视为Bingham屈服应力流体,分析影响电流变控制阀稳态控制性能的因素;忽略极化作用对电流变流体动力学的影响,对电流变阀的动态性能进行研究; 第二、基于相等控制体积法,分别确定平行平板型和同心圆柱型电流变控制阀的几何参数,并利用ANSYS验证两种阀的结构强度和刚度; 第三、利用FLUENT验证电流变控制阀内流体二维流动的柱塞流现象,以此为基础对两种电流变控制阀的三维流动进行分析,对比研究在不同的电场强度下两种电流变阀的流体动力控制性能,得出同心圆柱型电流变控制阀流体动力控制性能比平行平板型强; 第四、对已有实验装置进行改进,验证了电流变流体的Bingham特性参数,并通过调节外加激励电场,对两种电流变控制阀的流体动力控制性能进行实验对比分析,进一步验证了同心圆柱型电流变控制阀的实际应用优于平行平板型
[Abstract]:With the development of modern hydraulic control technology, the hydraulic system gradually requires the combination of microcomputer control to realize electrohydraulic integration, and put forward higher requirements for the control precision and dynamic performance. The electrorheological technology can change the apparent viscosity directly under the electric field to realize the flow rate and the stepless adjustment of the pressure. The electrorheological control valve based on its principle will become a research direction of the modern hydraulic technology. In this paper, the control principle of electrorheological valve is deeply analyzed on the basis of literature analysis and existing research results, by combining theory, simulation and experiment with relevant theoretical knowledge, such as hydrodynamics, numerical calculation and so on. The parallel plate electrorheological control valve and concentric cylindrical electrorheological control valve are designed, the strength and stiffness of the structure are verified by ANSYS, and the internal hydrodynamic control is compared and analyzed by FLUENT software. Finally, the hydrodynamic control performance of two kinds of electrorheological control valves is compared and analyzed. In this paper, based on the experimental research on the dynamic transmission control of electrorheological fluids by S.S Zhu, the hydrodynamic control performance of two different types of electrorheological control valves is compared and studied. The main research work and innovations are as follows: first, Based on the previous research and analysis, the electrorheological fluid is regarded as Bingham yield stress fluid from the point of view of fluid mechanics, and the factors influencing the steady state control performance of ER control valve are analyzed, and the effect of polarization on ER hydrodynamics is ignored. The dynamic performance of electrorheological valve is studied. Secondly, based on the equal control volume method, the geometric parameters of parallel plate and concentric cylindrical electrorheological control valves are determined respectively. ANSYS is used to verify the structural strength and stiffness of the two valves. Thirdly, FLUENT is used to verify the plunger flow phenomenon of two-dimensional fluid flow in the electrorheological control valve, based on which the three-dimensional flow of the two kinds of electrorheological control valves is analyzed. The hydrodynamic control performance of two electrorheological valves under different electric field intensity is studied, and the hydrodynamic control performance of the concentric cylindrical electrorheological control valve is better than that of the parallel plate type. Fourthly, the existing experimental devices are improved. The Bingham characteristic parameters of electrorheological fluid are verified, and the hydrodynamic control performance of two electrorheological control valves is compared and analyzed by adjusting the external electric field. It is further verified that the concentric cylindrical electrorheological control valve is superior to the parallel plate type in practical application.
【学位授予单位】：湘潭大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH134

【参考文献】