本文選題：徑向滑動軸承 + 多瓦可傾瓦　； 參考：《浙江大學》2012年碩士論文

【摘要】：多瓦可傾瓦徑向滑動軸承常用于大型的水輪機等旋轉(zhuǎn)機械上,其工作性能直接影響整個機器的工作狀態(tài),又由于多瓦可傾瓦徑向滑動軸承的制造和試驗成本較高,而通過對軸承熱潤滑性能方面的理論研究能夠得到比較接近實際情況的結(jié)果,可用于指導軸承設(shè)計和參數(shù)優(yōu)化,因此,有必要研究多瓦可傾瓦徑向滑動軸承的熱潤滑性能。 本文第一部分闡述了研究多瓦可傾瓦徑向滑動軸承熱潤滑性能的工程意義,介紹了徑向滑動軸承的軸承結(jié)構(gòu)、支承與瓦塊、軸承承載形式、軸瓦材料、潤滑方式及軸承的失效形式等,從徑向滑動軸承的潤滑性能、可傾瓦徑向滑動軸承熱潤滑性能及徑向滑動軸承實驗研究等幾方面綜述了可傾瓦徑向滑動軸承熱潤滑性能的研究進展,并以此提出了本文的研究內(nèi)容。 第二部分推導了多瓦可傾瓦徑向滑動軸承的油膜厚度方程,建立了軸承熱流體動力潤滑(THD)的數(shù)學模型,主要有雷諾方程、油膜厚度方程、潤滑油粘度、密度—溫度關(guān)系式、能量方程、固體熱傳導方程、力及力矩平衡方程和邊界條件,并對方程進行無量綱和離散化處理,介紹了相應的數(shù)值計算方法,設(shè)計了數(shù)值計算流程,編制了FROTRAN計算程序,計算了算例軸承的熱潤滑參數(shù),分析了軸承運行工況、瓦塊支承位置、潤滑油熱傳導系數(shù)的選取等因素對軸承熱潤滑性能的影響。 第三部分推導了軸偏斜時的多瓦可傾瓦徑向滑動軸承的油膜厚度方程,分別編制了單自由度瓦和雙自由度瓦徑向滑動軸承在軸偏斜時的FORTRAN計算程序,對比分析了軸偏斜對這兩種可傾瓦徑向滑動軸承的熱潤滑性能的影響。 第四部分建立了多瓦可傾瓦徑向滑動軸承熱彈流(TEHD)分析的數(shù)學模型,計算了軸瓦彈性變形量,編制了相應的FORTRAN計算程序,在程序計算時,采用了變精度試算法以節(jié)省計算時間,對比分析了多瓦可傾瓦徑向滑動軸承THD與TEHD性能及在軸頸偏斜時的單自由度瓦徑向滑動軸承THD與TEHD性能,分析了軸承運行工況對其TEHD性能的影響。 第五部分總結(jié)了本文的工作內(nèi)容,指出了存在的不足以及進一步研究的內(nèi)容。
[Abstract]:Multi-tile tilting pad radial sliding bearing is often used in large rotating machinery such as hydraulic turbine. Its working performance directly affects the working state of the whole machine, and the manufacturing and testing cost of multi-tile tilting pad radial sliding bearing is high. Through the theoretical study of the bearing thermal lubrication performance, the results can be obtained close to the actual situation and can be used to guide the bearing design and parameter optimization. Therefore, it is necessary to study the thermal lubrication performance of the multi-tile tilting pad radial sliding bearing. In the first part of this paper, the engineering significance of studying the thermal lubrication performance of multi-tile tilting pad radial sliding bearing is expounded, and the bearing structure, bearing and tile block, bearing form, bearing material, bearing structure of radial sliding bearing are introduced. Lubrication methods and failure forms of bearings, lubricating properties of radial sliding bearings, The thermal lubrication performance of tilting pad radial sliding bearing and the experimental study of radial sliding bearing are reviewed in this paper, and the research contents of this paper are put forward. In the second part, the oil film thickness equation of multi-tile tilting pad radial sliding bearing is derived, and the mathematical model of bearing thermal hydrodynamic lubrication (THD) is established. There are Reynolds equation, oil film thickness equation, lubricating oil viscosity, density and temperature relation. The energy equation, solid heat conduction equation, force and torque balance equation and boundary condition are treated with dimensionless and discretization. The corresponding numerical calculation method is introduced, the numerical calculation flow is designed, and the FROTRAN calculation program is compiled. The thermal lubrication parameters of bearing are calculated and the influence of operating condition of bearing, bearing position of tile block and heat conduction coefficient of lubricating oil on the thermal lubrication performance of bearing is analyzed. In the third part, the oil film thickness equation of multi-tile tilting pad radial sliding bearing is derived, and the FORTRAN calculation program of single-freedom and two-degree-of-freedom radial sliding bearing under axial deflection is developed, respectively. The influence of shaft deflection on the thermal lubrication performance of these two tilting pad radial sliding bearings is analyzed. In the fourth part, the mathematical model of thermal elastohydrodynamic analysis of multi-tile tilting pad radial sliding bearing is established, the elastic deformation of bearing is calculated, the corresponding FORTRAN calculation program is compiled, and the variable precision test algorithm is used to save calculation time. The performance of THD and TEHD of multi-tile tilting pad radial sliding bearing and the performance of THD and TEHD of single-degree-of-freedom radial sliding bearing with journal deflection are compared and analyzed. The influence of bearing operating condition on TEHD performance is analyzed. The fifth part summarizes the work of this paper, points out the shortcomings and further research content.
【學位授予單位】：浙江大學
【學位級別】：碩士
【學位授予年份】：2012
【分類號】：TH133.3

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