本文選題：自潤(rùn)滑滑動(dòng)軸承 + 兩相流��； 參考：《遼寧科技大學(xué)》2017年碩士論文

【摘要】：添加自潤(rùn)滑材料所制成的自潤(rùn)滑滑動(dòng)軸承具有其它種類(lèi)的滑動(dòng)軸承所沒(méi)有的優(yōu)越性,是取代傳統(tǒng)軸承的換代產(chǎn)品,已被廣泛應(yīng)用于眾多領(lǐng)域。自潤(rùn)滑軸承的相關(guān)分析已成為時(shí)下軸承研究的熱點(diǎn)。本文針對(duì)自潤(rùn)滑滑動(dòng)軸承的工作狀態(tài)進(jìn)行數(shù)值模擬分析,結(jié)合兩相流理論、計(jì)算流體力學(xué)和計(jì)算固體力學(xué),應(yīng)用了ICEM CFD、FLUENT及ANAYS Workbench等軟件。不僅將兩相流理論應(yīng)用于機(jī)械領(lǐng)域,還實(shí)現(xiàn)了多種軟件的組合使用。此研究首先對(duì)氣基軸承進(jìn)行建模分析,研究了自潤(rùn)滑材料顆粒性質(zhì)不同時(shí),潤(rùn)滑膜承載能力、壓力及固相體積分?jǐn)?shù)分布情況。然后在不改變軸承模型的基礎(chǔ)上,改變軸承的潤(rùn)滑狀態(tài),施加少許潤(rùn)滑油,對(duì)油基軸承進(jìn)行分析并與氣基時(shí)的工作狀態(tài)進(jìn)行對(duì)比。最后對(duì)自潤(rùn)滑滑動(dòng)軸承的軸套進(jìn)行流固耦合分析,研究了軸承轉(zhuǎn)速變化時(shí),軸套的應(yīng)力及變形量分布情況。數(shù)值模擬的結(jié)果表明,在自潤(rùn)滑軸承處于干摩擦狀態(tài)時(shí),如果軸承轉(zhuǎn)速較高、自潤(rùn)滑材料顆粒體積分?jǐn)?shù)較大、顆粒直徑較小時(shí),可以獲得較大的潤(rùn)滑膜承載能力。且此時(shí)潤(rùn)滑膜的左下方壓力最大,自潤(rùn)滑材料顆粒也在此處最為集中。在自潤(rùn)滑軸承處于油潤(rùn)滑狀態(tài)時(shí),相比于氣基的情況,無(wú)論何種軸承轉(zhuǎn)速下油基潤(rùn)滑膜的承載能力均受顆粒直徑變化的影響較小。且氣基潤(rùn)滑膜中自潤(rùn)滑材料顆粒的性質(zhì)決定了潤(rùn)滑膜的承載能力和最大壓力,而在油基潤(rùn)滑膜中,其作用則大為降低。在氣基潤(rùn)滑膜流場(chǎng)與軸套耦合時(shí),發(fā)現(xiàn)隨著軸承轉(zhuǎn)速的增大,軸套的應(yīng)力及變形量的最大值與區(qū)域面積均隨之不斷增大,但應(yīng)力值始終遠(yuǎn)小于鋼背的屈服極限。而且軸承轉(zhuǎn)速的變化對(duì)軸套應(yīng)力及變形量的分布趨勢(shì)無(wú)較大影響,只有數(shù)值上的改變。通過(guò)本文研究出的成果,可以深入了解自潤(rùn)滑滑動(dòng)軸承各種情況下的工作狀態(tài),為其優(yōu)化設(shè)計(jì)、延長(zhǎng)使用壽命及提高可靠性提供一些理論依據(jù),具有比較大的實(shí)際意義。
[Abstract]:Self-lubricating sliding bearings made by adding self-lubricating materials have the advantages that other kinds of sliding bearings have not. They are replacement products of traditional bearings and have been widely used in many fields. The correlation analysis of self-lubricating bearing has become the hot spot of bearing research. In this paper, the working state of self-lubricating sliding bearings is numerically simulated and analyzed. Combined with the two-phase flow theory, the software ICEM CFDF fluent and ANAYS Workbench are used to calculate hydrodynamics and computational solid mechanics. The two-phase flow theory is not only applied to the mechanical field, but also realized the combination of many kinds of software. In this study, first of all, the modeling and analysis of gas based bearings were carried out, and the distribution of load carrying capacity, pressure and volume fraction of solid phase of self-lubricating materials with different particle properties were studied. Then, on the basis of not changing the bearing model, the lubrication state of the bearing is changed, a little lubricating oil is applied, and the oil base bearing is analyzed and compared with the working state when the bearing is based on air. Finally, the fluid-solid coupling analysis of the shaft sleeve of the self-lubricating sliding bearing is carried out, and the distribution of the stress and deformation of the sleeve is studied when the speed of the bearing changes. The numerical simulation results show that when the self-lubricating bearing is in the dry friction state, if the speed of the bearing is higher, the particle volume fraction of the self-lubricating material is larger, and the particle diameter is small, the bearing capacity of the lubricating film can be obtained. At this time, the pressure of the lower left of the lubrication film is the largest, and the self-lubricating material particles are also the most concentrated here. When the self-lubricating bearing is in the oil-lubricated state, the bearing capacity of the oil-based lubricating film is less affected by the change of particle diameter than that of the gas-based bearing under any bearing speed. The bearing capacity and maximum pressure of the film are determined by the properties of the self-lubricating material particles in the gas-base lubricating film, but the role of the self-lubricating material in the oil-based lubricating film is greatly reduced. It is found that with the increase of bearing speed, the maximum value of stress and deformation and the area of region increase with the coupling of gas lubricating film flow field with the sleeve, but the stress value is always much smaller than the yield limit of the steel back. Moreover, the change of bearing speed has no great influence on the distribution trend of the stress and deformation of the shaft sleeve, but only the numerical change. Through the research results in this paper, the working state of self-lubricating sliding bearings under various conditions can be deeply understood, which provides some theoretical basis for optimizing design, prolonging service life and improving reliability. It is of great practical significance.
【學(xué)位授予單位】：遼寧科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TH133.31

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