本文選題：機械驅(qū)動單鋼輪振動壓路機　切入點：振動液壓系統(tǒng)　出處：《長安大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

【摘要】：機械驅(qū)動單鋼輪振動壓路機是壓路機的主要機型,在我國壓路機市場上一直占據(jù)主導(dǎo)地位,主要用于基層、次基層的壓實作業(yè)。振動液壓系統(tǒng)作為整機的核心部分直接影響著整機的壓實質(zhì)量、可靠性、作業(yè)效率等多個指標,因此對液壓系統(tǒng)參數(shù)匹配進行研究具有重要的意義。通過對試驗樣機進行測試發(fā)現(xiàn),液壓系統(tǒng)起振過程中存在著嚴重的壓力沖擊現(xiàn)象,起振時間較長,功率需求過大,動態(tài)過程與平穩(wěn)工況功率需求差距較大等問題。針對樣機現(xiàn)存的問題,本文以理論分析為基礎(chǔ),仿真分析為手段對液壓系統(tǒng)進行分析研究。首先對振動系統(tǒng)兩種工況進行載荷的分析與計算,找出動態(tài)功率需求過大、功率存在較大差距的根本原因,提出了需要理論分析和仿真分析的問題。建立泵排量控制系統(tǒng)和泵—馬達系統(tǒng)的數(shù)學(xué)模型,得出電流控制信號與高壓腔壓力的關(guān)系式,為仿真分析奠定了理論基礎(chǔ)。以國產(chǎn)22t樣機為研究對象,探討液壓系統(tǒng)參數(shù)匹配的原則,從可靠性、使用壽命和系統(tǒng)效率三個方面對參數(shù)進行匹配分析并給出合理的匹配區(qū)間,并結(jié)合試驗結(jié)果評判樣機液壓系統(tǒng)參數(shù)匹配是否合理。針對起振過程出現(xiàn)的問題,提出了通過改變電流的輸入形式實現(xiàn)系統(tǒng)壓力和起振時間合理控制的解決方案。將建立的數(shù)學(xué)模型和simulink軟件結(jié)合建立液壓系統(tǒng)的仿真模型,并依據(jù)樣機提供的基本參數(shù)給定了仿真模型中的參數(shù)取值。利用仿真模型分析了不同斜坡信號對系統(tǒng)壓力與馬達轉(zhuǎn)速的影響,基于理論研究和仿真結(jié)果,確定了分段式斜坡信號作為電流輸入信號的較優(yōu)方案,解決樣機存在的起振時間較長、沖擊壓力較大的問題。
[Abstract]:Mechanical driven single steel wheel vibratory roller is the main type of roller. It has been playing a leading role in the market of roller in our country and is mainly used at the base level. As the core part of the whole machine, the vibratory hydraulic system directly affects the compaction quality, reliability, working efficiency and other indexes of the whole machine. Therefore, it is of great significance to study the parameter matching of hydraulic system. By testing the test prototype, it is found that there is a serious phenomenon of pressure shock in the process of starting vibration of hydraulic system, the starting time is longer, and the power demand is too large. The gap between the dynamic process and the power demand of the stationary working condition is large. In view of the existing problems of the prototype, this paper is based on the theoretical analysis. The method of simulation analysis is to analyze and study hydraulic system. Firstly, the load of vibration system is analyzed and calculated, and the root cause of excessive demand for dynamic power and large gap in power is found out. The mathematical models of pump displacement control system and pump-motor system are established, and the relationship between the current control signal and the pressure of high pressure cavity is obtained. This paper discusses the principle of parameter matching of hydraulic system, analyzes the parameters from three aspects of reliability, service life and system efficiency, and gives a reasonable matching interval. Combined with the test results, the parameters matching of the hydraulic system of the prototype is judged. This paper presents a solution to realize reasonable control of system pressure and vibration start time by changing the input form of current. The simulation model of hydraulic system is established by combining the established mathematical model with simulink software. The parameters of the simulation model are given according to the basic parameters provided by the prototype. The effects of different slope signals on the system pressure and motor speed are analyzed by using the simulation model, based on the theoretical research and simulation results. The segmented slope signal is chosen as the optimal scheme of the current input signal to solve the problem of the longer starting time and the larger impact pressure of the prototype.
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：U415.521

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