双喷嘴挡板伺服阀流场分析及其动静态特性研究
发布时间：2019-02-12 11:02
【摘要】：液压元件、系统及其控制,是世界上工业发达国家争相竞争发展的产业,并且被认为是衡量一个国家工业化水平高低的重要标志。我国液压工业在借鉴外国技术的基础上发展起来,得到了较大成就。然而我国液压工业发展存在着一定的问题,例如内部流道能量损失大、噪声大、寿命较短、对于液压阀及管路的设计较少应用有限元分析,通常是根据经验设计,因此,根据CFD这一现代化的数值计算工具分析液压元件和管路内的流场,并根据结果分析流场结构和液压阀的噪声、能量损失之间的关系是非常必要的。 对双喷嘴挡板伺服阀的喷嘴挡板级和主阀芯流场进行模拟分析、试验检验挡板阀的静态、动态特性是本文的主要工作。论文首先介绍了计算流体力学的相关内容,包括了计算流体力学的求解步骤和主要的计算方法、流体运动模型和紊流模型和FLUENT的简单介绍,对于计算流体力学有了初步认识。然后用INVENTER软件建立了双喷嘴挡板伺服阀的喷嘴挡板级和主阀的流场模型,用GAMBIT软件对其进行了网格的划分。论文建立分析了挡板不同位移和主阀阀芯在不同位置流场形状时候的流场形状,分析了对液压阀可能产生的影响。得到了在喷嘴挡板的位置能量耗散较大,并且速度有较大变化,同时温度在此处有较大提升的结论,在主阀极流场分析中得到在阀口开启的时候,液流速度会产生较大变化,压力在此处变化也较大,能量耗散集中在此处,同时针对主阀芯做出一些改进,分析了改进后主阀级流场形状,并且与未改进之前的流场进行了比较,得出改进后的阀芯在流体进入阀腔的时候,速度及压力变化显著减小。 论文介绍了伺服阀的分类、工作原理和动静态性能指标参数。并且建立了伺服阀的数学模型,通过MATLAB对其动静态性能进行了仿真分析,通过实验得到了喷嘴挡板阀的内泄漏、空载流量曲线、压力特性曲线、分辨率等一系列的静态特性曲线,最后进行了双喷嘴挡板伺服阀的动态性能测试,通过时域和频域的响应曲线得到了伺服阀的幅频宽和相频宽,并且得到了其频率范围。
[Abstract]:Hydraulic components, systems and their control are the competitive industries of the developed countries in the world, and are regarded as an important symbol to measure the industrialization level of a country. The hydraulic industry of our country has developed on the basis of foreign technology, and has made great achievements. However, there are some problems in the development of hydraulic industry in China, such as large energy loss of internal runner, large noise, short life, less application of finite element analysis to the design of hydraulic valves and pipes, usually based on experience, so, It is necessary to analyze the flow field in hydraulic components and pipes according to CFD, a modern numerical calculation tool, and to analyze the relationship between the flow field structure and the noise and energy loss of hydraulic valves according to the results. The flow field of the nozzle baffle and the main valve core of the double nozzle baffle servo valve is simulated and analyzed. The static and dynamic characteristics of the baffle valve are tested and the main work of this paper is to test the static and dynamic characteristics of the baffle valve. This paper first introduces the relevant contents of computational fluid dynamics, including the solving steps and main calculation methods of computational fluid dynamics, the simple introduction of fluid motion model, turbulence model and FLUENT, and has a preliminary understanding of computational fluid mechanics. Then the flow field model of the double nozzle baffle servo valve and the main valve is established by using INVENTER software, and the mesh is divided by GAMBIT software. In this paper, the flow field shape of different displacement of baffle and main valve core in different position flow field shape is analyzed, and the possible influence on hydraulic valve is analyzed. The results show that the energy dissipation at the nozzle baffle is larger, and the velocity varies greatly, and the temperature is greatly raised here. In the analysis of the flow field of the main valve pole, the liquid flow velocity will change greatly when the valve is opened. The pressure changes greatly here, and the energy dissipation is concentrated here. At the same time, some improvements are made for the main valve core, and the shape of the improved main valve stage flow field is analyzed and compared with the flow field before the improvement. It is concluded that when the fluid enters the valve chamber, the change of velocity and pressure decreases significantly. This paper introduces the classification, working principle and dynamic and static performance parameters of servo valve. The mathematical model of the servo valve is established, and the dynamic and static performance of the valve is simulated by MATLAB. The internal leakage, the empty load flow curve and the pressure characteristic curve of the nozzle baffle valve are obtained by experiments. Finally, the dynamic performance of the double nozzle baffle servo valve is tested. The amplitude-frequency width and phase frequency width of the servo valve are obtained by the response curves in time domain and frequency domain, and the frequency range of the servo valve is obtained.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH137.52
[Abstract]:Hydraulic components, systems and their control are the competitive industries of the developed countries in the world, and are regarded as an important symbol to measure the industrialization level of a country. The hydraulic industry of our country has developed on the basis of foreign technology, and has made great achievements. However, there are some problems in the development of hydraulic industry in China, such as large energy loss of internal runner, large noise, short life, less application of finite element analysis to the design of hydraulic valves and pipes, usually based on experience, so, It is necessary to analyze the flow field in hydraulic components and pipes according to CFD, a modern numerical calculation tool, and to analyze the relationship between the flow field structure and the noise and energy loss of hydraulic valves according to the results. The flow field of the nozzle baffle and the main valve core of the double nozzle baffle servo valve is simulated and analyzed. The static and dynamic characteristics of the baffle valve are tested and the main work of this paper is to test the static and dynamic characteristics of the baffle valve. This paper first introduces the relevant contents of computational fluid dynamics, including the solving steps and main calculation methods of computational fluid dynamics, the simple introduction of fluid motion model, turbulence model and FLUENT, and has a preliminary understanding of computational fluid mechanics. Then the flow field model of the double nozzle baffle servo valve and the main valve is established by using INVENTER software, and the mesh is divided by GAMBIT software. In this paper, the flow field shape of different displacement of baffle and main valve core in different position flow field shape is analyzed, and the possible influence on hydraulic valve is analyzed. The results show that the energy dissipation at the nozzle baffle is larger, and the velocity varies greatly, and the temperature is greatly raised here. In the analysis of the flow field of the main valve pole, the liquid flow velocity will change greatly when the valve is opened. The pressure changes greatly here, and the energy dissipation is concentrated here. At the same time, some improvements are made for the main valve core, and the shape of the improved main valve stage flow field is analyzed and compared with the flow field before the improvement. It is concluded that when the fluid enters the valve chamber, the change of velocity and pressure decreases significantly. This paper introduces the classification, working principle and dynamic and static performance parameters of servo valve. The mathematical model of the servo valve is established, and the dynamic and static performance of the valve is simulated by MATLAB. The internal leakage, the empty load flow curve and the pressure characteristic curve of the nozzle baffle valve are obtained by experiments. Finally, the dynamic performance of the double nozzle baffle servo valve is tested. The amplitude-frequency width and phase frequency width of the servo valve are obtained by the response curves in time domain and frequency domain, and the frequency range of the servo valve is obtained.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH137.52
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