本文選題：比例多路閥　切入點(diǎn)：O形均壓槽　出處：《燕山大學(xué)》2015年碩士論文

【摘要】：比例多路閥可以控制多個(gè)回路同時(shí)工作,具有體積小、節(jié)約能量、降低油溫和控制精度高的優(yōu)點(diǎn),在工程機(jī)械中得到廣泛應(yīng)用。但由于比例多路閥摩擦力的作用導(dǎo)致的閥芯卡死、低速爬行、流量滯環(huán)大、壓力沖擊大等現(xiàn)象,因此本論文對(duì)比例多路閥進(jìn)行徑向力和摩擦力的分析,從閥結(jié)構(gòu)改進(jìn)和摩擦補(bǔ)償方法兩方面進(jìn)行研究,以減小摩擦力對(duì)比例閥性能的影響,提高比例多路閥的性能。本文以某種型號(hào)比例多路閥為研究對(duì)象,分析閥芯摩擦力產(chǎn)生的原因,從閥結(jié)構(gòu)改進(jìn)和摩擦力補(bǔ)償兩方面進(jìn)行了研究,主要研究?jī)?nèi)容如下:首先,分析閥芯本身結(jié)構(gòu)特點(diǎn)對(duì)閥芯摩擦力增大甚至卡澀、卡死產(chǎn)生的影響,對(duì)多路閥閥芯偏心及順錐時(shí)受到的徑向力進(jìn)行理論建模。分析閥芯設(shè)計(jì)常用的矩形均壓槽和本文設(shè)計(jì)采用的O形均壓槽,采用Fluent軟件對(duì)閥套與閥芯間隙流場(chǎng)進(jìn)行仿真,研究這兩種形式的均壓槽對(duì)閥芯徑向力、摩擦力和泄漏量的影響。其次,借助多路閥的性能測(cè)試實(shí)驗(yàn)平臺(tái),采集實(shí)驗(yàn)數(shù)據(jù)來(lái)計(jì)算以獲得摩擦力和速度加速度等相關(guān)數(shù)據(jù)。由于黏性Lu Gre模型在描述閥芯較高速度運(yùn)動(dòng)時(shí)對(duì)摩擦力反映更為貼合實(shí)際,所以本課題采用此模型進(jìn)行摩擦參數(shù)辨識(shí)。分別采用Lu Gre模型和黏性Lu Gre模型對(duì)多路閥的摩擦特性進(jìn)行參數(shù)辨識(shí)。用MATLAB中擬合工具箱對(duì)黏性Lu Gre模型靜態(tài)參數(shù)進(jìn)行辨識(shí),采用μPSO算法對(duì)黏性Lu Gre模型動(dòng)態(tài)參數(shù)進(jìn)行辨識(shí)。最后,本文通過(guò)分析比例多路閥的工作原理,采用AMESim建立多路閥物理模型,并對(duì)模型進(jìn)行了驗(yàn)證。根據(jù)黏性Lu Gre模型特征設(shè)計(jì)摩擦力狀態(tài)觀測(cè)器,并用MATLAB/Simulink進(jìn)行了封裝。采用AMESim/MATLAB聯(lián)合仿真技術(shù)將摩擦補(bǔ)償器加入到多路閥物理模型。對(duì)黏性Lugre模型補(bǔ)償方法進(jìn)行仿真并和傳統(tǒng)PID摩擦補(bǔ)償方法進(jìn)行對(duì)比,分析兩種方法優(yōu)缺點(diǎn),得出基于黏性Lu Gre模型摩擦補(bǔ)償具有更好的補(bǔ)償效果。
[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.
【學(xué)位授予單位】：燕山大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TH134;TH117.1

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