数字开关液压系统中流体惯性效应分析与实验  

Analysis and experiment of fluid inertia in digital switched hydraulic system

作　　者：陈晓明 朱玉川[1] 高强[1] 吴昌文 CHENXiaoming;ZHU Yuchuan;GAO Qiang;WU Changwen(College of Mechanical and Electrical Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China)

机构地区：[1]南京航空航天大学机电学院,江苏南京210016

出　　处：《华中科技大学学报（自然科学版）》2020年第6期70-76,共7页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(51575258)。

摘　　要：以数字开关液压系统中的流体惯性效应为研究对象,基于高速开关阀动力学模型与动态管路传输模型,结合管路中压力波传播特性,构建两位两通高速开关阀匹配惯性管的阀控缸液压系统分析模型,实现高速开关阀输出特性与惯性管内流体动态压力变化的实时耦合,分析了两者之间的耦合作用,并通过实验验证了流体惯性效应的存在.实验结果与分析模型Ⅱ(包含阀芯动力学模型与流体惯性效应)结果一致性较好,表明分析模型Ⅱ下的压力波传播过程可以表征惯性管内的流体惯性效应与寄生液感效应,高速开关阀的动态特性直接影响惯性管内压力波传播特性,可为数字开关惯性液压系统的设计提供依据.In order to describe the fluid inertia effect in the digital switched hydraulic system,based on a dynamic model of high speed on-off valve and dynamic transmission line model,combined with pressure wave propagation inside pipeline,the hydraulic system controlled by 2-position,2-way high speed on-off valve and inertance tube was performed.The real-time interaction between the output characteristics of the high speed on-off valve and the dynamic pressure change in the inertance tube was performed in this model,and the fluid inertia effect in the inertance tube was found with the help of discussion of coupling interaction both of them,which was validated in the corresponding experiments.The results indicate that the experimental results are well agreement with that of the analysis model.The modelⅡ(including dynamic model of spool and fluid inertia effect) can effectively describe the fluid inertance effect and parasitic inductance in the inertance tube with analysis of wave propagation process.The dynamic characteristics of the high speed on-off valve directly affects the pressure wave propagation effect in the inertance tube. These evidence lay foundations for the further research of digital switched inertance hydraulic device.

关 键 词：数字开关液压系统 高速开关阀 惯性管 压力波传播 流体惯性效应 

分 类 号：TH137[机械工程—机械制造及自动化]