本文關鍵詞：基于電容法的點接觸潤滑狀態(tài)研究　出處：《大連海事大學》2011年碩士論文　論文類型：學位論文

  更多相關文章： 電容法 鏡像法 矩量法 彈流潤滑

【摘要】：實際工作中,經(jīng)常會出現(xiàn)點接觸這一類高副潤滑表面,如滾動軸承等。這一類機械零件在生產(chǎn)實踐中經(jīng)常因為摩擦磨損而產(chǎn)生故障。為了延長零件的使用壽命,本文必須對這一類零件接觸面的摩擦狀態(tài)有清楚的認識。因而點接觸彈流潤滑理論成為了當前的研究熱點,許多學者都參與到這個研究領域中來,并提出了若干假設和理論。 本文在廣泛參考國內(nèi)外相關文獻的基礎上,搭建了點接觸旋轉式試驗臺,并且針對此實驗臺構建了彈流計算理論模型。在理論模型構建中,用Barus和Renolds的黏度定義替換了Hamrock-Dowson點接觸膜厚公式中的黏度定義式,并仿照#12誘導方程的設定方法,自行設定了新的誘導方程,簡化了計算、提高了理論精度。對該理論模型的計算結果與Hamrock-Dowson公式所計算的結果進行了對比,得出了兩者結果基本一致。本文還運用電容法對自行設計的實驗臺的油膜厚度的變化趨勢進行了測量和分析,得出不同轉速與載荷下電容值的變化規(guī)律,以及對應最小油膜厚度的變化趨勢。用鏡像法與矩量法對電容值進行了計算,并且分析了鏡像法與矩量法計算結果產(chǎn)生偏差的原因。將計算出的電容值與實測電容值進行了對比與分析。研究結果表明：當載荷一定時,電容值隨轉速的增加而減小,并且減小的幅度隨轉速的增加而變小。在定轉速的條件下,電容值隨載荷的增加而增加,并且增加的幅度隨載荷的增加而變小。電容值的變化受轉速的變化影響較大而載荷對電容值的影響較小。計算電容值隨著最小膜厚的變大也變小,并且隨著最小膜厚的增大,電容值減小的幅度越來越小。Hamrock-Dowson點接觸膜厚公式所計算出的油膜厚度與針對本實驗臺所構建的理論模型所計算出的油膜厚度的偏差受到黏溫系數(shù)的影響。在出口區(qū)產(chǎn)生壓力陡增現(xiàn)象。并且在定載荷的情況下,當轉速增加時壓力陡增的峰值變大并向油膜中心區(qū)靠近。在出口區(qū)也出現(xiàn)膜厚頸縮現(xiàn)象,并且在定載荷的情況下,當轉速增加時頸縮區(qū)域向油膜中心區(qū)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.

【學位授予單位】：大連海事大學
【學位級別】：碩士
【學位授予年份】：2011
【分類號】：TH117.2

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本文編號：1386819