SM4-20双喷嘴挡板式电液伺服阀特性研究
发布时间：2019-05-28 08:10
【摘要】：电液伺服阀是伺服系统的核心,伺服阀决定了整个系统性能好坏。对电液伺服阀的流场特性和动态特性进行研究,以此为依据来改进伺服阀的性能,具有一定的理论意义与工程实用价值。 本论文介绍了双喷嘴挡板式电液伺服阀的基本结构与工作原理,并推导出双喷嘴挡板阀各环节的基本数学公式。主要进行了力矩马达的磁路分析,建立了马达力矩方程,并通过对双喷嘴挡板阀前置级和功率级的分析,得到喷嘴挡板压力—流量方程、主阀芯流量连续性方程、主阀芯运动方程和主阀芯阀口流量方程,得到伺服阀各环节的传递函数及伺服阀总的传递函数。 以威格士SM4-20双喷嘴挡板式伺服阀做为原型阀,根据伺服阀前置的尺寸,应用Pro/E软件建立前置级流场的三维简化模型,并运用GAMBIT对流场模型进行网格划分。运用计算流体力学方法,对喷嘴挡板级进行了流场仿真,获得阀的压力分布、速度分布等,并做出阀的压力曲线和流量曲线。 在原型阀流场模拟的基础上,改变阀的几个重要参数。对改变参数后的模型进行仿真计算,获得不同参数下的模型特性曲线,得到最优参数。利用FLUENT软件中的混合模型,求解出流场中流体的压力、气体含量及速度分布,及空穴现象发生的主要部位,并对这些部位进行参数优化,获得最优结构参数。 分析了影响伺服阀动态性能的参数,并提出相应的改进方案。利用MATLAB软件中Simulink模块,对伺服阀的动态特性进行分析,验证改进方案的可行性,并进行参数优化。 本文从流场的角度出发,构建了双喷嘴挡板式电液伺服阀的数学模型,以FLUENT仿真软件为工具,分别研究在单相流模型和混合模型下,双喷嘴挡板阀前置级的流场分布,并对几个重要参数进行尺寸优化。以Simulink软件为工具,研究影响伺服阀动态特性的主要参数。该流程为双喷嘴挡板阀的产品设计与研发具有一定的参考价值,同时对其他类型伺服阀的仿真有一定的借鉴意义。
[Abstract]:Electro-hydraulic servo valve is the core of servo system, and servo valve determines the performance of the whole system. The flow field characteristics and dynamic characteristics of electro-hydraulic servo valve are studied on the basis of which to improve the performance of servo valve, which has certain theoretical significance and practical value in engineering. In this paper, the basic structure and working principle of double nozzle baffle electro-hydraulic servo valve are introduced, and the basic mathematical formulas of each link of double nozzle baffle valve are derived. The magnetic circuit analysis of the torque motor is carried out, and the torque equation of the motor is established. Through the analysis of the front stage and power level of the double nozzle baffle valve, the pressure-flow equation of the nozzle baffle and the flow continuity equation of the main valve core are obtained. The transfer function of each link of the servo valve and the total transfer function of the servo valve are obtained by the motion equation of the main valve core and the flow equation of the main valve core valve. Taking the Vickers SM4-20 double nozzle baffle servo valve as the prototype valve, according to the front size of the servo valve, the three-dimensional simplified model of the front stage flow field is established by using Pro/E software, and the flow field model is meshed by GAMBIT. The flow field at the nozzle baffle level is simulated by computational fluid dynamics (CFD). The pressure distribution and velocity distribution of the valve are obtained, and the pressure curve and flow curve of the valve are made. Based on the simulation of the flow field of the prototype valve, several important parameters of the valve are changed. The model with different parameters is simulated and calculated, and the characteristic curves of the model under different parameters are obtained, and the optimal parameters are obtained. The mixed model in FLUENT software is used to solve the pressure, gas content and velocity distribution of the fluid in the outflow field, as well as the main parts of the hole phenomenon, and the parameters of these parts are optimized to obtain the optimal structural parameters. The parameters that affect the dynamic performance of servo valve are analyzed, and the corresponding improvement scheme is put forward. Using Simulink module in MATLAB software, the dynamic characteristics of servo valve are analyzed, the feasibility of the improved scheme is verified, and the parameters are optimized. In this paper, the mathematical model of double nozzle baffle electro-hydraulic servo valve is constructed from the point of view of flow field. The flow field distribution at the front stage of double nozzle baffle valve under single phase flow model and mixed model is studied by using FLUENT simulation software as a tool. Several important parameters are optimized. Using Simulink software as a tool, the main parameters affecting the dynamic characteristics of servo valve are studied. This process has certain reference value for the product design and research and development of double nozzle baffle valve, and has certain reference significance for the simulation of other types of servo valve.
【学位授予单位】：兰州理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TH137.5
本文编号：2486889
[Abstract]:Electro-hydraulic servo valve is the core of servo system, and servo valve determines the performance of the whole system. The flow field characteristics and dynamic characteristics of electro-hydraulic servo valve are studied on the basis of which to improve the performance of servo valve, which has certain theoretical significance and practical value in engineering. In this paper, the basic structure and working principle of double nozzle baffle electro-hydraulic servo valve are introduced, and the basic mathematical formulas of each link of double nozzle baffle valve are derived. The magnetic circuit analysis of the torque motor is carried out, and the torque equation of the motor is established. Through the analysis of the front stage and power level of the double nozzle baffle valve, the pressure-flow equation of the nozzle baffle and the flow continuity equation of the main valve core are obtained. The transfer function of each link of the servo valve and the total transfer function of the servo valve are obtained by the motion equation of the main valve core and the flow equation of the main valve core valve. Taking the Vickers SM4-20 double nozzle baffle servo valve as the prototype valve, according to the front size of the servo valve, the three-dimensional simplified model of the front stage flow field is established by using Pro/E software, and the flow field model is meshed by GAMBIT. The flow field at the nozzle baffle level is simulated by computational fluid dynamics (CFD). The pressure distribution and velocity distribution of the valve are obtained, and the pressure curve and flow curve of the valve are made. Based on the simulation of the flow field of the prototype valve, several important parameters of the valve are changed. The model with different parameters is simulated and calculated, and the characteristic curves of the model under different parameters are obtained, and the optimal parameters are obtained. The mixed model in FLUENT software is used to solve the pressure, gas content and velocity distribution of the fluid in the outflow field, as well as the main parts of the hole phenomenon, and the parameters of these parts are optimized to obtain the optimal structural parameters. The parameters that affect the dynamic performance of servo valve are analyzed, and the corresponding improvement scheme is put forward. Using Simulink module in MATLAB software, the dynamic characteristics of servo valve are analyzed, the feasibility of the improved scheme is verified, and the parameters are optimized. In this paper, the mathematical model of double nozzle baffle electro-hydraulic servo valve is constructed from the point of view of flow field. The flow field distribution at the front stage of double nozzle baffle valve under single phase flow model and mixed model is studied by using FLUENT simulation software as a tool. Several important parameters are optimized. Using Simulink software as a tool, the main parameters affecting the dynamic characteristics of servo valve are studied. This process has certain reference value for the product design and research and development of double nozzle baffle valve, and has certain reference significance for the simulation of other types of servo valve.
【学位授予单位】：兰州理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TH137.5
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