基于电容法的点接触润滑状态研究

发布时间：2018-01-06 07:13

本文关键词：基于电容法的点接触润滑状态研究　出处：《大连海事大学》2011年硕士论文　论文类型：学位论文

更多相关文章： 电容法 镜像法 矩量法 弹流润滑

【摘要】：实际工作中,经常会出现点接触这一类高副润滑表面,如滚动轴承等。这一类机械零件在生产实践中经常因为摩擦磨损而产生故障。为了延长零件的使用寿命,本文必须对这一类零件接触面的摩擦状态有清楚的认识。因而点接触弹流润滑理论成为了当前的研究热点,许多学者都参与到这个研究领域中来,并提出了若干假设和理论。本文在广泛参考国内外相关文献的基础上,搭建了点接触旋转式试验台,并且针对此实验台构建了弹流计算理论模型。在理论模型构建中,用Barus和Renolds的黏度定义替换了Hamrock-Dowson点接触膜厚公式中的黏度定义式,并仿照#12诱导方程的设定方法,自行设定了新的诱导方程,简化了计算、提高了理论精度。对该理论模型的计算结果与Hamrock-Dowson公式所计算的结果进行了对比,得出了两者结果基本一致。本文还运用电容法对自行设计的实验台的油膜厚度的变化趋势进行了测量和分析,得出不同转速与载荷下电容值的变化规律,以及对应最小油膜厚度的变化趋势。用镜像法与矩量法对电容值进行了计算,并且分析了镜像法与矩量法计算结果产生偏差的原因。将计算出的电容值与实测电容值进行了对比与分析。研究结果表明：当载荷一定时,电容值随转速的增加而减小,并且减小的幅度随转速的增加而变小。在定转速的条件下,电容值随载荷的增加而增加,并且增加的幅度随载荷的增加而变小。电容值的变化受转速的变化影响较大而载荷对电容值的影响较小。计算电容值随着最小膜厚的变大也变小,并且随着最小膜厚的增大,电容值减小的幅度越来越小。Hamrock-Dowson点接触膜厚公式所计算出的油膜厚度与针对本实验台所构建的理论模型所计算出的油膜厚度的偏差受到黏温系数的影响。在出口区产生压力陡增现象。并且在定载荷的情况下,当转速增加时压力陡增的峰值变大并向油膜中心区靠近。在出口区也出现膜厚颈缩现象,并且在定载荷的情况下,当转速增加时颈缩区域向油膜中心区靠近。
[Abstract]:In actual work, often contact the high lubrication surface, such as rolling bearings. This kind of mechanical parts in the production practice often due to friction and wear failure. In order to prolong the service life of parts, we must on the parts of the friction surface state have a clear understanding and point. Contact Elastohydrodynamic Lubrication Theory has become the focus of current research, many scholars are involved in this research field, and puts forward some hypotheses and theories.
Based on extensive literatures at home and abroad, to build a contact rotating test rig, and the experiment platform is constructed EHL calculation theoretical model. In the construction of the theoretical model, using Barus and Renolds to replace the definition of viscosity viscosity defined type Hamrock-Dowson point contact film thickness in the formula, and according to the method set induced by #12 equation, set by the new equation, simplified the calculation and improve the accuracy of theory. The calculated results are compared to the theoretical model and Hamrock-Dowson formula of the calculated results, the two results are basically the same trend. This paper also used the capacitance method for oil film thickness on self-designed platform the measured and analysis, obtains the variation of different speed and load capacitance values, and the corresponding minimum film thickness. The changes of electric image method and moment method Capacitance values were calculated and analyzed the image method and moment method for calculating the deviation results. The calculated capacitance values are compared and analyzed with the measured capacitance values. The results show that: when the load is constant, the capacitance decreases with the increase of speed, and reduces with the increasing of engine speed but smaller. In constant speed condition, the capacitance value increases with the increase of load, and increases with the increase of load decreases. The variation of capacitance changes influenced by the speed and load has little effect on the capacitance of the capacitor. The calculation value with the minimum film thickness becomes larger small, and with the minimum film thickness increases, the deviation of the thickness of oil film theory model of oil film thickness capacitance decreased degree is becoming smaller.Hamrock-Dowson point contact film thickness formula is calculated and constructed according to the experiment platform of the calculated Affected by the viscosity temperature coefficient. In the export pressure rise phenomenon. And in constant load condition, when the speed increases the peak pressure sharply becomes large and close to the oil film to the center. In the export zone is also the film thickness necking, and under constant load, when the speed increases the necking zone close to the oil film center.

【学位授予单位】：大连海事大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH117.2

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