本文選題：液壓錐閥 + 振動(dòng)��； 參考：《西南交通大學(xué)》2012年碩士論文

【摘要】：作為液壓傳動(dòng)與控制中非常重要的基礎(chǔ)性元件,液壓錐閥具有密封性好,抗污染能力強(qiáng),構(gòu)造簡(jiǎn)單等特點(diǎn),從而廣泛應(yīng)用于液壓系統(tǒng)中。但液壓錐閥在使用過程中所產(chǎn)生的振動(dòng)、空化、噪聲等問題嚴(yán)重影響了其應(yīng)用場(chǎng)合。隨著液壓技術(shù)的發(fā)展,對(duì)液壓元件的性能提出了更高的要求,因此,液壓錐閥的振動(dòng)、靜態(tài)和空化方面的特性得到了學(xué)術(shù)界和工業(yè)界廣泛的關(guān)注。 論文主要采用CFD軟件對(duì)液壓錐閥的內(nèi)流場(chǎng)進(jìn)行建模和仿真,重點(diǎn)研究液壓錐閥產(chǎn)生振動(dòng)的原因以及如何從結(jié)構(gòu)上消振的方法,附帶模擬和計(jì)算不同結(jié)構(gòu)錐閥的空化特性,從流體可視化的角度,分析不同結(jié)構(gòu)錐閥易于產(chǎn)生空化的位置和強(qiáng)弱。 論文主要包括五部分內(nèi)容：(1)利用STAR-CD對(duì)簡(jiǎn)化的錐閥模型進(jìn)行參數(shù)化六面體網(wǎng)格建模,通過ANSYS CFX的動(dòng)態(tài)和穩(wěn)態(tài)計(jì)算,重點(diǎn)分析錐角“A”和閥芯圓周直徑“B”的大小對(duì)錐閥振動(dòng)特性和靜態(tài)特性的影響。并計(jì)算和分析閥口倒角對(duì)錐閥性能的影響；(2)根據(jù)閥芯動(dòng)力學(xué)方程和流量方程,建立錐閥的動(dòng)態(tài)數(shù)學(xué)模型,并在SIMULINK中搭建系統(tǒng)的數(shù)學(xué)模型,分析模型得出穩(wěn)態(tài)液動(dòng)力的大小和方向是對(duì)錐閥動(dòng)態(tài)特性有較大影響的參數(shù)；(3)對(duì)日立建機(jī)使用中存在振動(dòng)問題的錐閥,建立CFD模型并進(jìn)行不同開度下的穩(wěn)態(tài)計(jì)算,綜合數(shù)學(xué)模型和不同開度下的壓力分布云圖,從結(jié)構(gòu)上指出該錐閥易于產(chǎn)生振動(dòng)的原因,并對(duì)原始結(jié)構(gòu)進(jìn)行改進(jìn),計(jì)算改進(jìn)結(jié)構(gòu)的流場(chǎng)分布并與原始結(jié)構(gòu)比較,最后通過入口階躍壓力作用下的閥芯動(dòng)態(tài)響應(yīng)計(jì)算,驗(yàn)證了關(guān)于振動(dòng)原因理論分析的正確性；(4)對(duì)日立建機(jī)的原始錐閥結(jié)構(gòu)進(jìn)行結(jié)構(gòu)優(yōu)化,研究不同結(jié)構(gòu)參數(shù)對(duì)錐閥振動(dòng)特性的影響,得出除了穩(wěn)態(tài)液動(dòng)力之外,入口的細(xì)長(zhǎng)環(huán)逢節(jié)流也易引起錐閥的振動(dòng)。根據(jù)振動(dòng)的影響因素,提出三種優(yōu)化結(jié)構(gòu)錐閥,分別對(duì)其進(jìn)行穩(wěn)態(tài)和動(dòng)態(tài)CFD計(jì)算,驗(yàn)證了振動(dòng)因素分析的正確性；(5)對(duì)原始結(jié)構(gòu)和改進(jìn)結(jié)構(gòu)錐閥進(jìn)行CFD空化模擬,在流場(chǎng)仿真中加入空化模型以研究不同結(jié)構(gòu)錐閥的空化特性,根據(jù)計(jì)算結(jié)果以及閥芯表面的壓力分布曲線得出：原始結(jié)構(gòu)錐閥易于振動(dòng)但不易產(chǎn)生空化,優(yōu)化和改進(jìn)結(jié)構(gòu)不易振動(dòng)但卻更易于產(chǎn)生空化,空化現(xiàn)象和振動(dòng)現(xiàn)象是一對(duì)矛盾體存在于錐閥之中。
[Abstract]:As a very important basic component in hydraulic transmission and control, hydraulic cone valve is widely used in hydraulic system because of its good sealing ability, strong anti-pollution ability and simple structure. However, the problems of vibration, cavitation and noise in the process of application of hydraulic cone valve have seriously affected its application. With the development of hydraulic technology, higher requirements for the performance of hydraulic components have been put forward. Therefore, the vibration, static and cavitation characteristics of hydraulic cone valves have been widely concerned by academia and industry. In this paper, the internal flow field of hydraulic cone valve is modeled and simulated by CFD software. The reason of vibration of hydraulic cone valve and the method of how to eliminate vibration from structure are studied, and the cavitation characteristics of different structure cone valve are simulated and calculated. From the point of view of fluid visualization, the position and strength of cavitation of conical valves with different structures are analyzed. The thesis includes five parts: 1) Parametric hexahedron mesh modeling of simplified conical valve model using STAR-CD, and dynamic and steady calculation of ANSYS CFX. The influence of cone angle "A" and valve core circumference diameter "B" on the vibration and static characteristics of cone valve is analyzed. According to the dynamic equation of valve core and flow equation, the dynamic mathematical model of cone valve is established, and the mathematical model of the system is built in SIMULINK. The model shows that the size and direction of steady hydraulic force is a parameter that has great influence on the dynamic characteristics of cone valve. The CFD model is established for the cone valve with vibration problem in the use of Hitachi machine, and the steady-state calculation under different opening degree is carried out. By synthesizing the mathematical model and the pressure distribution cloud diagram under different opening degrees, the paper points out the reason why the cone valve is easy to vibrate from the structure, and improves the original structure, calculates the flow field distribution of the improved structure and compares it with the original structure. Finally, by calculating the dynamic response of valve core under the action of entrance step pressure, the correctness of theoretical analysis of vibration cause is verified. The original conical valve structure of Hitachi machine is optimized. The influence of different structural parameters on the vibration characteristics of conical valve is studied. It is concluded that in addition to the steady hydraulic force, the tapered valve vibration is easily caused by the throttling of the inlet slender ring. According to the influence factors of vibration, three kinds of optimized structural cone valves are put forward, and the steady-state and dynamic CFD calculations are carried out, respectively. The correctness of vibration factor analysis is verified. The CFD cavitation simulation of the original structure and the improved structure cone valve is carried out. Cavitation model is added to the flow field simulation to study the cavitation characteristics of cone valves with different structures. According to the calculation results and the pressure distribution curve of the valve core surface, it is concluded that the original structure cone valve is easy to vibrate but not easy to produce cavitation. The optimization and improvement of the structure are not easy to vibrate but it is easier to produce cavitation. Cavitation and vibration are a pair of contradictory bodies in the cone valve.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2012
【分類號(hào)】：TH137.52

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 王安麟;吳小鋒;周成林;馬博;;基于CFD的液壓滑閥多學(xué)科優(yōu)化設(shè)計(jì)[J];上海交通大學(xué)學(xué)報(bào);2010年12期

2 程俊蘭,吳曉明;21世紀(jì)的液壓技術(shù)發(fā)展展望[J];通用機(jī)械;2003年03期

3 曹秉剛，史維祥，中野和夫;內(nèi)流式錐閥液動(dòng)力的理論探討[J];西安交通大學(xué)學(xué)報(bào);1995年07期

4 曹秉剛，，史維祥，中野和夫;內(nèi)流式錐閥液動(dòng)力及閥芯錐面壓強(qiáng)分布的實(shí)驗(yàn)研究[J];西安交通大學(xué)學(xué)報(bào);1995年07期

5 李惟祥;劉曉紅;鄧斌;;基于CFD的液壓錐閥動(dòng)態(tài)和靜態(tài)性能研究[J];液壓氣動(dòng)與密封;2011年06期

6 郁凱元;盛敬超;;關(guān)于內(nèi)流式錐閥穩(wěn)態(tài)液動(dòng)力方向的探討——與有關(guān)液壓傳動(dòng)教科書作者們商榷[J];液壓與氣動(dòng);2006年10期

7 王林翔,陳鷹,路甬祥;液壓閥道內(nèi)三維流體流動(dòng)的數(shù)值分析[J];中國機(jī)械工程;1999年02期

8 高紅,傅新,楊華勇,筑地征浩;球閥閥口氣穴流場(chǎng)的數(shù)值模擬與實(shí)驗(yàn)研究[J];中國機(jī)械工程;2003年04期

9 劉曉紅;柯堅(jiān);;基于計(jì)算流體動(dòng)力學(xué)解析的液壓錐閥噪聲評(píng)價(jià)[J];中國機(jī)械工程;2007年22期

10 鐘英杰,都晉燕,張雪梅;CFD技術(shù)及在現(xiàn)代工業(yè)中的應(yīng)用[J];浙江工業(yè)大學(xué)學(xué)報(bào);2003年03期

相關(guān)博士學(xué)位論文 前1條

1 王國志;電液比例軸向變量柱塞泵的特性研究[D];西南交通大學(xué);2009年

相關(guān)碩士學(xué)位論文 前3條

1 劉凱;一種基于空化數(shù)的液壓元件空蝕評(píng)價(jià)方法[D];西南交通大學(xué);2011年

2 鄭淑娟;閥芯運(yùn)動(dòng)過程液壓錐閥內(nèi)部流場(chǎng)的CFD計(jì)算[D];太原理工大學(xué);2005年

3 許慧;內(nèi)流工況液壓錐閥內(nèi)部流場(chǎng)的三維可視化模擬與仿真[D];太原理工大學(xué);2007年

本文編號(hào)：1779050