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  本文關(guān)鍵詞：新型電流變閥的設(shè)計(jì)及實(shí)驗(yàn)研究　出處：《吉林大學(xué)》2011年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 電流變閥 電場強(qiáng)度 流量 壓力差 平板間隙

【摘要】：在液壓領(lǐng)域用傳統(tǒng)閥來實(shí)現(xiàn)系統(tǒng)內(nèi)流動介質(zhì)流通截止功能和壓力流量控制功能,要選用不同的閥控系統(tǒng)。當(dāng)要求上述的兩種功能同時實(shí)現(xiàn)時,傳統(tǒng)閥門就不再適用,無論是實(shí)現(xiàn)什么功能的傳統(tǒng)閥都有著不可避免的缺陷和不足。 當(dāng)把電流變技術(shù)引入到液壓領(lǐng)域可以研制出一種新的閥控系統(tǒng)稱為電流變閥。它用電信號控制實(shí)現(xiàn)上述兩種不同功能的組合使用,有效的避免傳統(tǒng)閥的缺陷。電流變閥的優(yōu)點(diǎn)是： (1)電信號直接作用于流動介質(zhì)實(shí)現(xiàn)對壓力和流量的控制。 (2)工作頻率高,響應(yīng)快,滯后小,控制過程中不需要傳統(tǒng)機(jī)構(gòu)的輔助,控制速度和精度高。 (3)不存在相接觸的運(yùn)動副,所以無機(jī)械磨損,壽命長。 (4)不需要較高的機(jī)械加工精度,生產(chǎn)成本低,加工工藝簡單。 本文對電流變閥內(nèi)影響流體壓力的因素進(jìn)行了理論分析,發(fā)現(xiàn)電流變閥的壓差主要由兩部分組成。一部分是由電流變閥的結(jié)構(gòu)參數(shù)產(chǎn)生的基本壓力差,只隨流量變化；另一部分是由電流變效應(yīng)產(chǎn)生的電致壓力差,它與電流變閥的結(jié)構(gòu)參數(shù)和電場強(qiáng)度有關(guān)。分析了電流變液在無外加電場作用時在平行板縫隙內(nèi)的速度分布情況,并根據(jù)電流變效應(yīng)的知識預(yù)測了外加電場時閥內(nèi)的速度分布情況。 根據(jù)理論分析的結(jié)論,設(shè)計(jì)了一種新型的多間隙平行板串聯(lián)結(jié)構(gòu)的電流變閥。通過增減電極板的數(shù)量分別對兩間隙和四間隙的電流變閥進(jìn)行FLUENT仿真分析并組建試驗(yàn)系統(tǒng)進(jìn)行實(shí)驗(yàn)研究。試驗(yàn)和仿真結(jié)果表明隨著電場的增加,壓力差增大,這種增大的趨勢近似呈高階曲線分布；隨著流量的增大,壓力差增大,它的增長趨勢近似呈線性；在場強(qiáng)流量給定時流道縫隙增加,壓力差減��；在相同的外部條件下,串聯(lián)流道越多,壓力差越大。 新型電流變閥和傳統(tǒng)電流變閥相比,它的優(yōu)勢在于能有效地增大壓差,提高閥的截止能力；根據(jù)不同的外部需要可以適當(dāng)?shù)脑鰷p電極板的數(shù)量,組合成不同結(jié)構(gòu)的電流變閥；可以用螺栓來調(diào)整平行極板的間隙,來實(shí)現(xiàn)無級調(diào)節(jié)流量和壓差的功能。 受電流變液的性能和實(shí)驗(yàn)器材的限制,實(shí)驗(yàn)并沒有體現(xiàn)出閥的全部性能,比如電流變液發(fā)生固化后的性能受材料所限就沒能進(jìn)行驗(yàn)證。但是實(shí)驗(yàn)驗(yàn)證了電流變效應(yīng)的產(chǎn)生,并且驗(yàn)證了壓力與流量、場強(qiáng)、平板間隙的關(guān)系。 本文介紹的電流變閥是電流變技術(shù)在工程上的典型應(yīng)用。因其具有傳統(tǒng)電流變閥所不具有一系列優(yōu)勢,隨著電流變技術(shù)的成熟,它的應(yīng)用將會更加廣泛。
[Abstract]:In the hydraulic field, the traditional valve is used to realize the flow cut-off function and the pressure flow control function in the system. Different valve control systems should be selected. When the two functions mentioned above are required to be realized at the same time. Traditional valves are no longer applicable, no matter what the functions of the traditional valves have inevitable defects and deficiencies. When the electrorheological technology is introduced into the hydraulic field, a new valve control system called electrorheological valve can be developed. Effectively avoid defects in conventional valves. The advantages of electrorheological valves are: 1) the electric signal acts directly on the flowing medium to control the pressure and flow rate. 2) High frequency, fast response, small lag, no need of traditional mechanism in the control process, high control speed and precision. There are no contact pairs, so there is no mechanical wear and long life. No need for high machining precision, low production cost and simple processing technology. In this paper, the factors affecting the fluid pressure in the ER valve are theoretically analyzed. It is found that the pressure difference of the ER valve is mainly composed of two parts, one is the basic pressure difference caused by the structural parameters of the ERV. Only with the flow rate; The other part is the electrically induced pressure difference caused by the electrorheological effect, which is related to the structure parameters and the electric field intensity of the electrorheological valve. The velocity distribution of the electrorheological fluid in the slot of the parallel plate is analyzed without the applied electric field. According to the knowledge of electrorheological effect, the velocity distribution in the valve is predicted when the applied electric field is applied. According to the conclusion of theoretical analysis. A new type of electrorheological valve with multi-gap parallel plate in series was designed. By adding and decreasing the number of electrode plates, the electrorheological valve with two and four clearances was simulated and analyzed by FLUENT and the test system was set up. Experimental research. Experimental and simulation results show that with the increase of electric field. When the pressure difference increases, the increasing trend is approximately a high-order curve distribution. With the increase of flow rate, the pressure difference increases, and its growth trend is approximately linear. The field strong flow rate increases the slot of the timing channel and decreases the pressure difference. Under the same external conditions, the more serial channels, the greater the pressure difference. Compared with the traditional electrorheological valve, the advantages of the new ER valve are that it can effectively increase the pressure difference and improve the cut-off capacity of the valve. According to different external needs, the number of electrode plates can be appropriately increased or decreased, and the electrorheological valves with different structures can be assembled; Bolts can be used to adjust the clearance of parallel plates to achieve stepless regulation of flow and pressure differential function. Limited by the performance of electrorheological fluid and experimental equipment, the experiment did not reflect the full performance of the valve. For example, the properties of electrorheological fluids after solidification can not be verified by the material, but the effect of electrorheological effect is verified by experiments, and the relationship between pressure and flow rate, field strength and plate gap is verified. The electrorheological valve introduced in this paper is a typical application of electrorheological technology in engineering. Because it has a series of advantages that the traditional ER valve does not have, it will be used more widely with the maturity of ER technology.
【學(xué)位授予單位】：吉林大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2011
【分類號】：TH137.52

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