本文選題：水潤滑　切入點(diǎn)：橡膠軸承　出處：《重慶大學(xué)》2011年碩士論文　論文類型：學(xué)位論文

【摘要】：以水為潤滑介質(zhì)的板條式水潤滑橡膠合金軸承,與傳統(tǒng)以油為潤滑介質(zhì)的金屬軸承的潤滑機(jī)理有所不同。水的黏度只有油1/100,當(dāng)供水壓力高,軸頸轉(zhuǎn)速高時(shí),容易產(chǎn)生紊流,因此在對潤滑模型進(jìn)行有限元分析時(shí),不能將水膜假設(shè)為層流模型。橡膠為低彈性模量材料,在流體動(dòng)壓潤滑時(shí),橡膠變形量大,不能像金屬軸承那樣忽略不計(jì)。橡膠彈性變形的退讓使得軸的偏心率可以大于1。板條式水潤滑橡膠合金軸承溝槽的存在,使得水膜壓力較油潤滑低,一方面由于溫度對橡膠材料的力學(xué)特性影響較大,需要溝槽中的冷卻水將產(chǎn)生的熱量帶走;另一方面溝槽為橡膠變形提供空間,改善橡膠與銅粘接面的受力。 論文針對板條式水潤滑橡膠合金軸承特殊的潤滑機(jī)理,利用Workbench CFX有限元軟件對軸承潤滑模型進(jìn)行3D數(shù)值仿真分析。論文從轉(zhuǎn)速、偏心率、橡膠材料、板條結(jié)構(gòu)等角度對水膜壓力分布、水膜流場分布、水膜厚度等方面深入研究了板條式水潤滑軸承的流體動(dòng)壓潤滑性能。由于橡膠軸承動(dòng)壓潤滑過程是一個(gè)雙向的流固耦合,因此橡膠的彈性變形,應(yīng)力分布等也是論文研究的重點(diǎn)。 隨后通過實(shí)驗(yàn)研究了溫度對橡膠材料性能的影響,因?yàn)楫?dāng)軸承系統(tǒng)供水系統(tǒng)出現(xiàn)故障或是軸承系統(tǒng)出現(xiàn)過載時(shí),軸與軸承之間處于干摩擦狀態(tài)。當(dāng)軸承系統(tǒng)處于干摩擦狀態(tài)時(shí)不僅摩擦系數(shù)會(huì)增大而加速軸與軸承的磨損,還會(huì)使軸承溫度升高,改變橡膠的力學(xué)性能,加速橡膠老化,甚至出現(xiàn)燒焦現(xiàn)象。 根據(jù)實(shí)驗(yàn)得到的數(shù)據(jù),論文進(jìn)一步利用ABAQUS有限元軟件對板條式水潤滑橡膠合金軸承,在干摩擦狀態(tài)下的熱結(jié)構(gòu)耦合模型進(jìn)行了分析。通過分析論文研究了板條式水潤滑橡膠合金軸承在干摩擦工況時(shí)軸承系統(tǒng)接觸面的溫度分布、接觸應(yīng)力分布以及能量隨時(shí)間的變化。 論文內(nèi)容得到國家自然科學(xué)基金面上項(xiàng)目“大尺寸高比壓水潤滑軸承的創(chuàng)新設(shè)計(jì)理論與方法”(項(xiàng)目編號:50775230)的支持,擬通過上述研究對板條式水潤滑橡膠合金軸承的潤滑機(jī)理和干摩擦熱結(jié)構(gòu)耦合的相關(guān)研究方法提供新的借鑒。
[Abstract]:The lubricating mechanism of sheet water lubricated rubber alloy bearing with water as lubricating medium is different from that of metal bearing with traditional oil lubricating medium. The viscosity of water is only 1 / 100 of oil. When the water supply pressure is high and the rotation speed of shaft neck is high, turbulence is easy to occur. Therefore, in the finite element analysis of lubrication model, water film can not be assumed as laminar flow model. Rubber elastic deformation makes the eccentric ratio of shaft greater than 1.The water film pressure is lower than oil lubrication due to the existence of grooves in sheet-type water lubricated rubber alloy bearings. On the one hand, because of the influence of temperature on the mechanical properties of rubber materials, it is necessary to take away the heat produced by cooling water in the grooves; on the other hand, the grooves provide space for rubber deformation and improve the stress on the rubber and copper bonding surfaces. Aiming at the special lubrication mechanism of strip water lubricated rubber alloy bearing, this paper uses Workbench CFX finite element software to carry on 3D numerical simulation analysis to the bearing lubrication model, from rotational speed, eccentricity, rubber material, In this paper, the hydrodynamic lubrication performance of strip water lubricated bearing is studied in terms of water film pressure distribution, water film flow field distribution, water film thickness, etc., because the hydrodynamic lubrication process of rubber bearing is a two-way fluid-solid coupling. Therefore, elastic deformation and stress distribution of rubber are also the focus of this paper. Then the effect of temperature on the properties of rubber material is studied experimentally, because when the water supply system of the bearing system fails or the bearing system is overloaded, When the bearing system is in a dry friction state, not only the friction coefficient will increase and the wear between the shaft and bearing will be accelerated, but also the bearing temperature will be raised, the mechanical properties of rubber will be changed, and the aging of rubber will be accelerated. Even scorching occurs. According to the experimental data, the paper further uses the ABAQUS finite element software to the strip type water lubricated rubber alloy bearing. The coupling model of thermal structure under dry friction state is analyzed. The temperature distribution of the contact surface of strip water lubricated rubber alloy bearing under dry friction condition is studied. The distribution of contact stress and the change of energy with time. The content of this paper is supported by the project of "innovative Design Theory and method of large size and High specific pressure Water Lubricating bearing" (Project No.: 50775230), supported by the National Natural Science Foundation of China. This study is intended to provide a new reference for the lubrication mechanism of strip water lubricated rubber alloy bearings and the related research methods for the coupling of dry friction and heat structure.
【學(xué)位授予單位】：重慶大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2011
【分類號】：TH133.3

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