射流管伺服阀的数学模型构建与分析

发布时间：2018-01-07 09:15

本文关键词：射流管伺服阀的数学模型构建与分析　出处：《兰州理工大学》2012年硕士论文　论文类型：学位论文

【摘要】：射流管伺服阀因其抗污染能力强、先导级效率高等优点,在要求性能可靠、运行稳定的液压控制系统中具有广泛的应用。然而,射流管伺服阀的先导级流场流动特性复杂、力矩马达结构精密,由于缺少完善的数学模型而其特性不易预测。因此,射流管伺服阀主要靠已有经验与大量试验来进行研发设计。本文基于数值仿真方法建立其整体数学模型,为射流管伺服阀的模型完善与优化设计提供参考。以射流管力反馈式两级电液伺服阀为例,介绍了其基本结构与工作原理,推导了各环节的基本数学公式。针对射流管阀的先导级流场模型,利用Fluent流场计算软件求解了其静态特性,给出了流场中流体的压力、气体含量及速度分布,并分析了上述参数的分布规律与变化情况。研究了射流管阀供油压力、回油压力、接收孔直径、喷嘴与接收器之间的距离、两接收孔夹角、接收器尖劈宽度等参数变化对射流管阀压力特性与流量特性的影响。针对力矩马达内各组件模型,利用Adina有限元仿真软件建立了力矩马达的有限元模型,分析了各组件的主要应力与变形区域,求解了弹簧管综合刚度与反馈弹簧刚度给出了射流管喷嘴位移与衔铁组件作用力的关系曲线以及反馈弹簧杆位移与其作用力的关系曲线。通过对力矩马达进行模态分析,获得了力矩马达的前6阶固有频率与振型,阐述了在各阶固有频率下的主要振型。通过上述环节求解获得的关键参数,将主要函数曲线拟合成相应的数学方程,并结合其他环节的基本数学公式,在基于键合图原理的AMESim系统仿真软件中构建了射流管力反馈式两级电液伺服阀的整体数学模型,给出了射流管伺服阀在各种输入信号下的输出流量响应曲线,分析了主要参数对其动态响应特性的影响。本文以Fluent、Adina、AMESim仿真软件为工具,通过数值仿真的手段建立了射流管力反馈式两级电液伺服阀的整体数学模型,模型可以模拟不同结构参数下阀的静态与动态性能。该建模流程为射流管伺服阀的产品设计与研发提供了参考依据,有利于提高新产品的研发效率,同时对其他各类电液伺服阀的仿真有一定的借鉴意义。
[Abstract]:The jet pipe servo valve is widely used in the hydraulic control system which requires reliable performance and stable operation because of its strong anti-pollution ability and high lead efficiency. The flow characteristics of the pilot stage of the jet tube servo valve are complex, the torque motor structure is precise, and its characteristics are difficult to predict because of the lack of perfect mathematical model. Based on the numerical simulation method, the whole mathematical model of the jet tube servo valve is established in this paper, which provides a reference for the model improvement and optimization design of the jet tube servo valve. Taking the two-stage electro-hydraulic servo valve with jet pipe force feedback as an example, this paper introduces its basic structure and working principle, deduces the basic mathematical formula of each link, and aims at the pilot stage flow field model of the jet pipe valve. The static characteristics of the flow field are solved by using the Fluent flow field calculation software, and the pressure, gas content and velocity distribution of the fluid in the flow field are given. The distribution and variation of the above parameters are analyzed. The oil supply pressure, return oil pressure, the diameter of the receiving hole, the distance between the nozzle and the receiver, and the angle between the two receiving holes are studied. The influence of nozzle width and other parameters on the pressure and flow characteristics of the jet pipe valve. The finite element model of torque motor is established by using Adina finite element simulation software, and the main stress and deformation regions of each component are analyzed. The relationship curve between the nozzle displacement of the jet tube and the force of the armature assembly and the curve between the displacement of the feedback spring rod and the force acting on the armature assembly are obtained by solving the comprehensive stiffness of the spring tube and the feedback spring stiffness. The simulation of the torque motor is carried out. State analysis. The first six natural frequencies and modes of the torque motor are obtained, and the main modes under each natural frequency are described. By solving the key parameters of the above links, the main function curves are fitted into the corresponding mathematical equations, and combined with the basic mathematical formulas of other links. In the AMESim system simulation software based on bond graph principle, the integral mathematical model of two-stage electro-hydraulic servo valve with jet pipe force feedback is constructed. The output flow response curve of the jet tube servo valve under various input signals is given, and the influence of main parameters on its dynamic response characteristics is analyzed. In this paper, the overall mathematical model of the two-stage electro-hydraulic servo valve with jet pipe force feedback is established by means of numerical simulation with fluentine Adinaan AMESim simulation software. The model can simulate the static and dynamic performance of the valve under different structural parameters. The modeling process provides a reference for the design and development of the jet tube servo valve, and is helpful to improve the efficiency of the new product research and development. At the same time, the simulation of other kinds of electro-hydraulic servo valve has certain reference significance.
【学位授予单位】：兰州理工大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH134;O242.1

【参考文献】