【作者】 李建国；

【导师】 权龙；

【作者基本信息】 太原理工大学 ， 机械电子工程， 2009， 硕士

【摘要】 降低液压系统能耗、噪声、减小废油处理对环境的污染,一直都是工程界研究的焦点。最为有效的方法是采用无节流损失的泵控技术,通过改变泵的转速或排量,使泵输出的流量和压力与负载要求完全匹配。在液压元件中,定量泵具有结构简单、工作可靠的优点,因此,在现代液压传动控制技术中,变转速定量泵控系统正日益受到人们的广泛重视,它融合了目前快速发展的电动机调速技术和液压技术的优点。在液压传动系统中,差动缸具有输出力大、单边滑动密封的效率及可靠性高、占用空间小、制造简单、成本低等优点,所以成为应用最为广泛的线性液压执行器。但差动缸由于两腔有效面积有差,致使差动缸两腔的进出口流量不相等,成为实现直接泵控技术必须解决的首要问题。为此,本文采用新的泵配流原理对叶片马达(泵)结构进行改造,利用Matlab/Simulink软件建立了新配流定量泵变转速控制差动缸闭式系统仿真模型。结果表明,实现了差动缸两腔流量的单泵直接补偿控制,简化了系统结构,节约了能量,提高了系统控制性能。其研究成果具有一定的理论意义和实用价值。本文主要进行了如下研究工作:1、通过查阅大量的国内外文献,总结了阀控、泵控差动缸技术的发展,分析了差动缸运动控制的本质非线性问题,即两腔有效面积的不相等所导致的差动缸进出口流量的不平衡。2、运用先进的系统控制仿真软件Matlab/Simulink进行了电液泵控差动缸系统仿真模型的构建。3、针对差动缸运动过程中所受到的不同工况进行了仿真研究,得出了与理论相符的仿真结果。更多还原

【Abstract】 Hydraulic system to lower power consumption, noise, reduce the waste oil to deal with the pollution of the environment has always been the focus of the engineering study, the most effective way is to cut expenditure without the loss of the use of pump-control technology, by changing the pump speed or displacement, so that pump output flow and pressure requirements of an exact match with the load. In hydraulic components, the fix displacement pump is simple in structure , high reliability, etc.So, in the modern hydraulic control technology, variable speed pump control system are also a wide range of great importance. It combines the rapid development of current motor drives technology and hydraulic technology.In the hydraulic drive system, the differential cylinder with large output force, unilateral sliding sealing efficiency and high reliability, small footprint, manufacturing simply and low cost, So it is most widely used. However, the effective area of the two chambers of differential cylinder are difference, result in the flow to the import and export is unequal, it is a direct pump-control technology issues that must be addressed chiefly. To solve these problems, in this paper, a new electrohydraulic pump control differential cylinder systems that a novel distributing flow of fix displacement pump (ie. the transformation of the distributing structure of vane motor) variable speed closed circuit system is proposed. It utilizes a pump direct compensating control of flow, the simplification of system structure, energysaving and improving system performance.In this paper, research work carried out as follows: Firstly, through consult a large number of domestic and foreign literature, summed up the valve, pump control differential cylinder technology, an analysis of the differential nature of cylinder motion control nonlinear problems, ie the effective area of the two chambers is not equal to the difference caused by import and export flow. Secondly, the use of advanced control system simulation software Matlab / Simulink for creating the simulation model of electrohydraulic pump control differential cylinder system. Lastly, for the process of the differential cylinder by the different working conditions of simulation studies, drawn in line with the theoretical simulation results.更多还原