發(fā)布時(shí)間：2018-08-11 18:19

【摘要】：隨著現(xiàn)代液壓控制技術(shù)的發(fā)展,液壓系統(tǒng)逐漸要求聯(lián)合微機(jī)控制實(shí)現(xiàn)機(jī)電液一體化,且對控制精度和控制動態(tài)性能提出更高的要求,利用電流變技術(shù)能在電場直接作用下改變表觀粘度以實(shí)現(xiàn)流量、壓力的無級調(diào)節(jié)等優(yōu)點(diǎn),應(yīng)用其原理的電流變控制閥將成為現(xiàn)代液壓技術(shù)的一個(gè)研究方向。本文采用理論、仿真和實(shí)驗(yàn)相結(jié)合的研究方法,綜合運(yùn)用流體力學(xué),數(shù)值計(jì)算方法等相關(guān)理論知識,在文獻(xiàn)分析和已有研究成果基礎(chǔ)上,深入分析電流變閥的控制原理,并對平行平板型電流變控制閥和同心圓柱型電流變控制閥進(jìn)行結(jié)構(gòu)設(shè)計(jì),利用ANSYS對其結(jié)構(gòu)強(qiáng)度和剛度進(jìn)行驗(yàn)證、利用FLUENT軟件對其內(nèi)部流體動力控制對比分析,最后實(shí)驗(yàn)對比分析兩種不同類型的電流變控制閥的流體動力控制性能。 本文在S.S Zhu對電流變流體的動力傳輸控制的實(shí)驗(yàn)研究基礎(chǔ)上,對兩種不同類型的電流變控制閥的流體動力控制性能進(jìn)行對比研究,主要研究工作和創(chuàng)新點(diǎn)如下: 第一、基于以往研究分析,從流體力學(xué)角度出發(fā),將電流變流體視為Bingham屈服應(yīng)力流體,分析影響電流變控制閥穩(wěn)態(tài)控制性能的因素;忽略極化作用對電流變流體動力學(xué)的影響,對電流變閥的動態(tài)性能進(jìn)行研究; 第二、基于相等控制體積法,分別確定平行平板型和同心圓柱型電流變控制閥的幾何參數(shù),并利用ANSYS驗(yàn)證兩種閥的結(jié)構(gòu)強(qiáng)度和剛度; 第三、利用FLUENT驗(yàn)證電流變控制閥內(nèi)流體二維流動的柱塞流現(xiàn)象,以此為基礎(chǔ)對兩種電流變控制閥的三維流動進(jìn)行分析,對比研究在不同的電場強(qiáng)度下兩種電流變閥的流體動力控制性能,得出同心圓柱型電流變控制閥流體動力控制性能比平行平板型強(qiáng); 第四、對已有實(shí)驗(yàn)裝置進(jìn)行改進(jìn),驗(yàn)證了電流變流體的Bingham特性參數(shù),并通過調(diào)節(jié)外加激勵電場,對兩種電流變控制閥的流體動力控制性能進(jìn)行實(shí)驗(yàn)對比分析,進(jìn)一步驗(yàn)證了同心圓柱型電流變控制閥的實(shí)際應(yīng)用優(yōu)于平行平板型
[Abstract]:With the development of modern hydraulic control technology, the hydraulic system gradually requires the combination of microcomputer control to realize electrohydraulic integration, and put forward higher requirements for the control precision and dynamic performance. The electrorheological technology can change the apparent viscosity directly under the electric field to realize the flow rate and the stepless adjustment of the pressure. The electrorheological control valve based on its principle will become a research direction of the modern hydraulic technology. In this paper, the control principle of electrorheological valve is deeply analyzed on the basis of literature analysis and existing research results, by combining theory, simulation and experiment with relevant theoretical knowledge, such as hydrodynamics, numerical calculation and so on. The parallel plate electrorheological control valve and concentric cylindrical electrorheological control valve are designed, the strength and stiffness of the structure are verified by ANSYS, and the internal hydrodynamic control is compared and analyzed by FLUENT software. Finally, the hydrodynamic control performance of two kinds of electrorheological control valves is compared and analyzed. In this paper, based on the experimental research on the dynamic transmission control of electrorheological fluids by S.S Zhu, the hydrodynamic control performance of two different types of electrorheological control valves is compared and studied. The main research work and innovations are as follows: first, Based on the previous research and analysis, the electrorheological fluid is regarded as Bingham yield stress fluid from the point of view of fluid mechanics, and the factors influencing the steady state control performance of ER control valve are analyzed, and the effect of polarization on ER hydrodynamics is ignored. The dynamic performance of electrorheological valve is studied. Secondly, based on the equal control volume method, the geometric parameters of parallel plate and concentric cylindrical electrorheological control valves are determined respectively. ANSYS is used to verify the structural strength and stiffness of the two valves. Thirdly, FLUENT is used to verify the plunger flow phenomenon of two-dimensional fluid flow in the electrorheological control valve, based on which the three-dimensional flow of the two kinds of electrorheological control valves is analyzed. The hydrodynamic control performance of two electrorheological valves under different electric field intensity is studied, and the hydrodynamic control performance of the concentric cylindrical electrorheological control valve is better than that of the parallel plate type. Fourthly, the existing experimental devices are improved. The Bingham characteristic parameters of electrorheological fluid are verified, and the hydrodynamic control performance of two electrorheological control valves is compared and analyzed by adjusting the external electric field. It is further verified that the concentric cylindrical electrorheological control valve is superior to the parallel plate type in practical application.
【學(xué)位授予單位】：湘潭大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2011
【分類號】：TH134

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本文編號：2177832