本文選題：比例方向閥 + 試驗系統(tǒng)��； 參考：《浙江大學(xué)》2013年碩士論文

【摘要】：比例閥是液壓系統(tǒng)中極其重要的元件,它的特性直接關(guān)系到液壓系統(tǒng)的品質(zhì)。同時由于比例閥相對于伺服閥成本低、對油液污染不敏感等優(yōu)點,在各領(lǐng)域都得到了廣泛的應(yīng)用。比例閥靜態(tài)特性已經(jīng)與伺服閥相當(dāng),動態(tài)響應(yīng)較慢。對閥進行數(shù)學(xué)分析,可以為改進閥的參數(shù)提供理論支持；研制比例閥測試系統(tǒng),不僅能對比例閥的動、靜態(tài)特性進行檢測,實現(xiàn)自動化、高精度測量,同時能直觀看到閥改進后的試驗效果。 本文基于動閥套比例反饋比例方向閥的基本結(jié)構(gòu),建立了數(shù)學(xué)模型和相關(guān)仿真分析,同時研制了一套針對被試閥的測試系統(tǒng)。論文的主要內(nèi)容如下： 第一章,概述了比例方向閥的國內(nèi)外發(fā)展現(xiàn)狀,以及特點和分類。同時簡單介紹了課題的研究背景及意義、主要研究意義及難點。 第二章,簡單介紹了本文研究閥的基本結(jié)構(gòu),針對閥的先導(dǎo)閥、主閥和節(jié)流閥,基于流量連續(xù)性方程和力的平衡方程建立了對應(yīng)的數(shù)學(xué)模型。 第三章,基于閥的數(shù)學(xué)模型,對相關(guān)公式進行拉氏變換,得到閥的傳遞函數(shù),基于Simulink對閥的相關(guān)動態(tài)特性進行仿真。同時基于AMESim對閥進行靜態(tài)特性仿真。針對閥在實際應(yīng)用中的死區(qū)問題,提出了三種死區(qū)補償策略。 第四章,介紹了比例閥測試試驗臺的研制過程,包括液壓系統(tǒng)設(shè)計,主要液壓和電氣元件的設(shè)計計算,下位機PLC和上位機LabVIEW軟件的編寫與通訊,測試系統(tǒng)軟件功能和界面的簡單介紹。 第五章,針對被試閥的試驗條件,提出了油溫控制方案。為了保證測試過程中閥壓差恒定,提出了分段PID控制策略。采用分段PID控制算法對閥壓差進行控制,實驗結(jié)果表明控制誤差能達到試驗標準的要求。根據(jù)試驗條件和工況,分析了閥的相關(guān)靜態(tài)特性試驗結(jié)果。 第六章,概括了全文的主要研究工作和成果,并展望了今后需進一步研究的工作和方向。
[Abstract]:Proportional valve is a very important component in hydraulic system. Its characteristic is directly related to the quality of hydraulic system.At the same time, proportional valve is widely used in various fields because of its low cost and insensitivity to oil pollution.The static characteristic of proportional valve is similar to that of servo valve, and the dynamic response is slow.The mathematical analysis of the valve can provide theoretical support for improving the parameters of the valve, and the development of the proportional valve test system can not only detect the dynamic and static characteristics of the proportional valve, but also realize the automatic and high precision measurement.At the same time, the test effect of the improved valve can be seen intuitively.Based on the basic structure of proportional feedback proportional directional valve with moving valve sleeve, the mathematical model and related simulation analysis are established in this paper, and a test system for the tested valve is developed at the same time.The main contents of the thesis are as follows:The first chapter summarizes the development of proportional directional valve at home and abroad, as well as the characteristics and classification.At the same time, the research background and significance, the main research significance and difficulties are briefly introduced.In the second chapter, the basic structure of the valve is briefly introduced, and the corresponding mathematical model is established for the pilot valve, main valve and throttle valve based on the flow continuity equation and the balance equation of force.In the third chapter, based on the mathematical model of the valve, the relevant formulas are transformed into Laplace transform, and the transfer function of the valve is obtained. The dynamic characteristics of the valve are simulated based on Simulink.At the same time, the static characteristics of the valve are simulated based on AMESim.In order to solve the dead zone problem in practical application, three dead-time compensation strategies are proposed.In the fourth chapter, the development process of proportional valve test bench is introduced, including hydraulic system design, design and calculation of main hydraulic and electrical components, compilation and communication of PLC and LabVIEW software.Brief introduction of the software function and interface of the test system.In the fifth chapter, according to the test conditions of the tested valve, the oil temperature control scheme is put forward.A piecewise PID control strategy is proposed to ensure the constant pressure difference of the valve during the testing process.The pressure difference of the valve is controlled by subsection PID control algorithm. The experimental results show that the control error can meet the requirements of the test standard.According to the test conditions and working conditions, the test results of the relevant static characteristics of the valve are analyzed.In chapter 6, the main research work and achievements are summarized, and the future work and direction are prospected.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：TH137.5

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本文編號：1764080