某型比例多路阀径向力和摩擦力分析与摩擦补偿研究

发布时间：2018-04-03 00:26

本文选题：比例多路阀　切入点：O形均压槽　出处：《燕山大学》2015年硕士论文

【摘要】：比例多路阀可以控制多个回路同时工作,具有体积小、节约能量、降低油温和控制精度高的优点,在工程机械中得到广泛应用。但由于比例多路阀摩擦力的作用导致的阀芯卡死、低速爬行、流量滞环大、压力冲击大等现象,因此本论文对比例多路阀进行径向力和摩擦力的分析,从阀结构改进和摩擦补偿方法两方面进行研究,以减小摩擦力对比例阀性能的影响,提高比例多路阀的性能。本文以某种型号比例多路阀为研究对象,分析阀芯摩擦力产生的原因,从阀结构改进和摩擦力补偿两方面进行了研究,主要研究内容如下:首先,分析阀芯本身结构特点对阀芯摩擦力增大甚至卡涩、卡死产生的影响,对多路阀阀芯偏心及顺锥时受到的径向力进行理论建模。分析阀芯设计常用的矩形均压槽和本文设计采用的O形均压槽,采用Fluent软件对阀套与阀芯间隙流场进行仿真,研究这两种形式的均压槽对阀芯径向力、摩擦力和泄漏量的影响。其次,借助多路阀的性能测试实验平台,采集实验数据来计算以获得摩擦力和速度加速度等相关数据。由于黏性Lu Gre模型在描述阀芯较高速度运动时对摩擦力反映更为贴合实际,所以本课题采用此模型进行摩擦参数辨识。分别采用Lu Gre模型和黏性Lu Gre模型对多路阀的摩擦特性进行参数辨识。用MATLAB中拟合工具箱对黏性Lu Gre模型静态参数进行辨识,采用μPSO算法对黏性Lu Gre模型动态参数进行辨识。最后,本文通过分析比例多路阀的工作原理,采用AMESim建立多路阀物理模型,并对模型进行了验证。根据黏性Lu Gre模型特征设计摩擦力状态观测器,并用MATLAB/Simulink进行了封装。采用AMESim/MATLAB联合仿真技术将摩擦补偿器加入到多路阀物理模型。对黏性Lugre模型补偿方法进行仿真并和传统PID摩擦补偿方法进行对比,分析两种方法优缺点,得出基于黏性Lu Gre模型摩擦补偿具有更好的补偿效果。
[Abstract]:The proportional multi-way valve can control multiple circuits to work at the same time, which has the advantages of small volume, energy saving, low oil temperature and high control precision, so it is widely used in construction machinery.However, due to the effect of the friction force of proportional multiway valve, the valve core is stuck, crawling at low speed, the flow hysteresis is large, the pressure impact is large, so the radial force and friction force of proportional multiway valve are analyzed in this paper.In order to reduce the influence of friction force on the performance of proportional valve and improve the performance of proportional multi-way valve, the improvement of valve structure and the method of friction compensation are carried out in order to reduce the influence of friction force on the performance of proportional valve.This paper takes a certain type of proportional multi-way valve as the research object, analyzes the causes of the valve core friction, and studies the valve structure improvement and friction compensation. The main research contents are as follows: first of all,This paper analyzes the influence of the structural characteristics of the valve core on the increase of the friction force and even the sticking of the valve core, and the radial force caused by the eccentricity and the coning of the multi-way valve core.This paper analyzes the rectangular equal pressure slot used in the design of the valve core and the O-shape equal pressure groove used in the design of the valve core. The flow field between the valve sleeve and the valve core clearance is simulated by using Fluent software, and the effects of the two types of pressure equalizing groove on the radial force, friction force and leakage rate of the valve core are studied.Secondly, with the help of the multi-channel valve performance test platform, the experimental data are collected to calculate the friction force and velocity acceleration and other relevant data.Because the viscous Lu Gre model reflects the friction force more closely when describing the high velocity movement of the valve core, the model is used to identify the friction parameters.Lu Gre model and viscous Lu Gre model are used to identify the friction characteristics of the valve.The static parameters of viscous Lu Gre model are identified by fitting toolbox in MATLAB, and the dynamic parameters of viscous Lu Gre model are identified by 渭 PSO algorithm.Finally, by analyzing the working principle of proportional multi-way valve, the physical model of multi-way valve is established by AMESim, and the model is verified.Friction state observer is designed according to the characteristics of viscous Lu Gre model and encapsulated with MATLAB/Simulink.The friction compensator is added to the physical model of multi-way valve by AMESim/MATLAB joint simulation technology.The viscous Lugre model compensation method is simulated and compared with the traditional PID friction compensation method. The advantages and disadvantages of the two methods are analyzed. It is concluded that the friction compensation based on the viscous Lu Gre model has better compensation effect.
【学位授予单位】：燕山大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TH134;TH117.1

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