本文選題：泵-馬達(dá)　切入點：閉式液壓系統(tǒng)　出處：《中南大學(xué)》2012年碩士論文　論文類型：學(xué)位論文

【摘要】：經(jīng)過幾十年的發(fā)展和研究,泵—馬達(dá)閉式液壓驅(qū)動技術(shù)已能滿足多種工況下的使用要求,其工程應(yīng)用越來越廣泛。然而,隨著液壓技術(shù)的發(fā)展,人們越來越注重液壓系統(tǒng)的品質(zhì),對元件的壽命、噪聲等都有較高的要求。液壓系統(tǒng)壓力脈動是降低元件的壽命,引起液壓系統(tǒng)噪聲和振動的一個主要原因,減少液壓系統(tǒng)壓力脈動已成為當(dāng)前的一個研究熱點。本文針對泵—馬達(dá)閉式液壓系統(tǒng)工作過程中可能產(chǎn)生的壓力脈動機(jī)理進(jìn)行分析,提出有針對性的抑制壓力脈動的方法,通過仿真和實驗予以驗證。主要的研究工作如下： 1.綜述了泵—馬達(dá)閉式液壓傳動的特點、現(xiàn)狀及發(fā)展前景；分析了液壓系統(tǒng)壓力脈動的原因、危害及分類,結(jié)合液壓系統(tǒng)壓力脈動及其抑制方法的研究現(xiàn)狀,明確了論文研究的意義。 2.基于泵—馬達(dá)閉式液壓系統(tǒng)的工作原理,分析了可能導(dǎo)致系統(tǒng)壓力波動的幾個主要因素；根據(jù)壓力脈動的頻率特點,提出了有針對性的抑制系統(tǒng)壓力脈動的方法。 3.對柱塞泵和柱塞馬達(dá)的實際流量脈動進(jìn)行了理論分析,柱塞單元的實際輸出流量脈動主要受到配流盤結(jié)構(gòu)和泄漏的影響；對柱塞泵的流量脈動進(jìn)行了仿真,結(jié)果表明柱塞泵的實際流量脈動遠(yuǎn)大于理論值,頻率也為理論值的2倍；通過仿真研究了柱塞泵和柱塞馬達(dá)的實際流量脈動對系統(tǒng)壓力脈動的影響,驗證了利用柱塞泵和馬達(dá)流量脈動來減少系統(tǒng)壓力脈動的可行性。 4.建立了變量泵一定量馬達(dá)系統(tǒng)的SIMULINK仿真模型,通過仿真驗證負(fù)載變化時系統(tǒng)的壓力變化情況,結(jié)果表明：泵的輸出流量隨著控制電流線性變化,低壓側(cè)壓力穩(wěn)定性對系統(tǒng)高壓側(cè)壓力有一定影響,負(fù)載變化會引起系統(tǒng)壓力脈動,適當(dāng)改變系統(tǒng)的一些參數(shù)可以減少負(fù)載變化引起的壓力脈動,并接蓄能器是減少壓力脈動的有效措施。 5.搭建泵—馬達(dá)閉式液壓系統(tǒng)實驗平臺,通過實驗驗證了利用柱塞單元的實際流量脈動抑制系統(tǒng)壓力脈動是可行的；利用工程實例驗證了低壓側(cè)壓力穩(wěn)定性對高壓側(cè)壓力的影響,結(jié)果表明：確保低壓側(cè)壓力穩(wěn)定能有效減少高壓側(cè)壓力脈動。
[Abstract]:After decades of development and research, the pump-motor closed hydraulic drive technology has been able to meet the requirements of a variety of operating conditions, its engineering applications are more and more extensive. However, with the development of hydraulic technology, People pay more and more attention to the quality of hydraulic system, and have higher requirements for the life and noise of the components. The pressure pulsation of hydraulic system is one of the main reasons for reducing the life of the components and causing the noise and vibration of the hydraulic system. Reducing pressure pulsation in hydraulic system has become a hot research topic at present. In this paper, the mechanism of pressure pulsation that may occur in the working process of pump-motor closed hydraulic system is analyzed, and a targeted method to suppress pressure pulsation is put forward. The main research work is as follows:. 1. The characteristics, present situation and development prospect of pump motor closed hydraulic transmission are summarized, the causes, hazards and classification of pressure pulsation in hydraulic system are analyzed, and the research status of pressure pulsation in hydraulic system and its suppression method are analyzed. The significance of the research is clarified. 2. Based on the working principle of pump-motor closed hydraulic system, several main factors which may lead to pressure fluctuation of the system are analyzed, and according to the frequency characteristics of pressure pulsation, a method to restrain pressure fluctuation of the system is put forward. 3. The actual flow pulsation of plunger pump and plunger motor is theoretically analyzed. The actual output flow pulsation of plunger unit is mainly affected by the structure of distribution disk and leakage, and the flow pulsation of piston pump is simulated. The results show that the actual flow pulsation of the piston pump is far greater than the theoretical value and the frequency is 2 times of the theoretical value, and the effect of the actual flow pulsation of the piston pump and the plunger motor on the pressure pulsation of the system is studied by simulation. The feasibility of reducing system pressure pulsation by piston pump and motor flow pulsation is verified. 4. The SIMULINK simulation model of a certain amount of motor system of variable pump is established, and the pressure variation of the system is verified by simulation. The results show that the output flow of the pump changes linearly with the control current. The stability of low pressure side pressure has certain influence on the high pressure side pressure of the system. The pressure pulsation caused by the change of load can be reduced by changing some parameters of the system properly. Connecting with accumulator is an effective measure to reduce pressure fluctuation. 5. The experimental platform of pump-motor closed hydraulic system is built, and it is proved that it is feasible to restrain pressure pulsation by using the actual flow pulsation of plunger unit. The influence of low pressure lateral pressure stability on high pressure lateral pressure is verified by an engineering example. The results show that ensuring low pressure lateral pressure stability can effectively reduce high pressure lateral pressure fluctuation.
【學(xué)位授予單位】：中南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2012
【分類號】：TH137.51

【參考文獻(xiàn)】

相關(guān)期刊論文 前7條

1 吳元道;工程機(jī)械靜液壓傳動裝置[J];液壓氣動與密封;2002年04期

2 薛曉虎 ,杜金鳳;泵控馬達(dá)回路動態(tài)特性的影響因素分析[J];起重運(yùn)輸機(jī)械;2005年02期

3 李鋒,馬長林;液壓系統(tǒng)動態(tài)特性的SIMULINK仿真與優(yōu)化研究[J];計算機(jī)仿真;2003年05期

4 金文勝,安國軍,劉喜海,孫曉麗,楊昕宇;靜液壓驅(qū)動在農(nóng)業(yè)機(jī)械行走裝置上的應(yīng)用與發(fā)展趨勢[J];內(nèi)蒙古民族大學(xué)學(xué)報(自然科學(xué)版);2001年03期

5 陳季萍;;降低液壓系統(tǒng)壓力脈動方法的研究[J];煤礦機(jī)械;2006年06期

6 王海蘭,郭愛東;實施液壓系統(tǒng)綠色設(shè)計工程探討[J];液壓與氣動;2004年08期

7 邢科禮,葛思華,丁崇生,何鉞;新型串聯(lián)囊式蓄能器對油源壓力脈動影響的試驗研究[J];機(jī)床與液壓;1998年01期

相關(guān)碩士學(xué)位論文 前3條

1 邵建波;工程機(jī)械試驗臺液壓系統(tǒng)分析及工作裝置試驗方法研究[D];長安大學(xué);2006年

2 尤新榮;面向HST內(nèi)曲線液壓馬達(dá)的設(shè)計和實驗研究[D];浙江大學(xué);2002年

3 單長吉;壓力脈動衰減器的數(shù)學(xué)模型仿真及CFD流體解析[D];西南交通大學(xué);2004年

，

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