本文選題：水輪機(jī)　切入點(diǎn)：徑向滑動(dòng)軸承　出處：《浙江大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：由于旋轉(zhuǎn)機(jī)械系統(tǒng)中各種異常振動(dòng)的存在,常常引發(fā)災(zāi)難性的事故,其原因很難用線性理論來解釋,人們逐漸認(rèn)識(shí)到必須用非線性動(dòng)力學(xué)理論來分析。多瓦可傾瓦滑動(dòng)軸承常用于大型的汽輪機(jī)、水輪機(jī)和壓縮機(jī)等旋轉(zhuǎn)機(jī)械上,其工作性能直接影響整個(gè)機(jī)器的工作狀態(tài),因此,有必要對水輪機(jī)徑向滑動(dòng)軸承的潤滑特性進(jìn)行系統(tǒng)研究。 本文第一部分闡述了研究水輪機(jī)徑向滑動(dòng)軸承潤滑特性的工程意義,介紹了國內(nèi)外研究徑向滑動(dòng)軸承潤滑特性的相關(guān)方法和結(jié)論等,從轉(zhuǎn)子動(dòng)力學(xué)、瓦面熱變形和瞬態(tài)熱彈流潤滑理論等幾方面綜述了徑向滑動(dòng)軸承潤滑特性的研究進(jìn)展,并以此提出了本文的研究內(nèi)容。 第二部分建立了考慮制造誤差的多瓦可傾瓦徑向滑動(dòng)軸承熱彈流潤滑(TEHD)分析的計(jì)算模型,計(jì)算得到了考慮制造誤差時(shí)的瓦塊油膜厚度、油膜壓力、瓦面溫度分布等,并對比分析了多瓦可傾瓦徑向滑動(dòng)軸承在有無制造誤差時(shí)的熱彈流潤滑特性差異。 第三部分建立了多瓦可傾瓦徑向滑動(dòng)軸承熱變形分析的數(shù)學(xué)模型,編制了考慮熱變形影響的Fortran求解程序,對比分析兩種情況下多瓦可傾瓦徑向滑動(dòng)軸承的彈流潤滑特性差異,即僅考慮彈性變形和同時(shí)計(jì)入彈性變形和熱變形；詳細(xì)分析了軸瓦熱變形對軸承彈流潤滑特性的影響。 第四部分建立了窄軸承在動(dòng)載荷作用下的數(shù)學(xué)模型,利用Matlab編制相應(yīng)的計(jì)算程序,分別分析沖擊載荷、旋轉(zhuǎn)載荷和任意動(dòng)載荷(沖擊載荷和旋轉(zhuǎn)載荷的疊加)等不同類型載荷作用下窄軸承的潤滑特性,通過計(jì)算得到不同載荷作用下的軸心運(yùn)動(dòng)軌跡。 第五部分建立了多瓦可傾瓦軸承瞬態(tài)熱彈流潤滑的數(shù)學(xué)模型,包括瞬態(tài)雷諾方程、瞬態(tài)能量方程、瞬態(tài)熱傳導(dǎo)方程和運(yùn)動(dòng)方程,編制了相應(yīng)的瞬態(tài)計(jì)算程序,分析多瓦可傾瓦軸承在啟動(dòng)階段的瞬態(tài)潤滑特性,通過計(jì)算得到軸承由初始位置運(yùn)動(dòng)到平衡位置的軸心運(yùn)動(dòng)軌跡,并得到平衡位置時(shí)軸承的各項(xiàng)潤滑特性參數(shù),包括油膜厚度、流體動(dòng)壓力、瓦面溫度、瓦面熱彈變形與動(dòng)特性系數(shù)等。 第六部分總結(jié)了本文的工作內(nèi)容,指出了存在的不足以及需要進(jìn)一步研究的內(nèi)容。
[Abstract]:Due to the existence of various abnormal vibration in rotating machinery system, it often leads to catastrophic accidents, which is difficult to be explained by linear theory. People have come to realize that it is necessary to use nonlinear dynamic theory to analyze. Multi-tile tilting pad sliding bearings are often used in large rotating machinery such as steam turbines, water turbines and compressors, whose working performance directly affects the working state of the whole machine. It is necessary to study the lubrication characteristics of turbine radial sliding bearings. The first part of this paper describes the engineering significance of studying the lubrication characteristics of hydraulic turbine radial sliding bearings, and introduces the relevant methods and conclusions of studying the lubrication characteristics of radial sliding bearings at home and abroad, etc., from the rotor dynamics, The research progress on lubrication characteristics of radial sliding bearings is reviewed in the aspects of hot deformation and transient thermo-elastohydrodynamic lubrication theory of the bearing surface, and the research contents of this paper are put forward. In the second part, the calculation model of thermo-elastohydrodynamic lubrication (TEHDD) analysis of multi-tile tilting pad radial sliding bearing considering manufacturing error is established, and the thickness of tile oil film, oil film pressure and temperature distribution of tile surface are obtained when the manufacturing error is considered. The difference of thermo-elastohydrodynamic lubrication characteristics of multi-tile tilting pad radial sliding bearing with or without manufacturing error is compared and analyzed. In the third part, the mathematical model of thermal deformation analysis of multi-tile tilting pad radial sliding bearing is established, and the Fortran program considering the influence of thermal deformation is worked out. The difference of elastohydrodynamic lubrication characteristics of multi-tile tilting pad radial sliding bearing is compared and analyzed. The influence of bearing thermal deformation on the elastohydrodynamic lubrication characteristics of bearing is analyzed in detail. In the 4th part, the mathematical model of narrow bearing under the action of dynamic load is established, and the corresponding calculation program is compiled by Matlab to analyze the impact load respectively. The lubrication characteristics of narrow bearing under different loads, such as rotating load and random dynamic load (the superposition of impact load and rotating load), are calculated and the track of axial center motion under different loads is obtained. In the 5th part, the mathematical model of transient thermal elastohydrodynamic lubrication of multi-tile tilting pad bearing is established, including transient Reynolds equation, transient energy equation, transient heat conduction equation and motion equation, and the corresponding transient calculation program is worked out. In this paper, the transient lubrication characteristics of multi-tile tilting pad bearings at start-up stage are analyzed. The axial motion trajectory from the initial position to the equilibrium position is obtained, and the lubrication characteristic parameters of the bearing, including the thickness of the oil film, are obtained when the bearing is in the equilibrium position. Fluid dynamic pressure, tile surface temperature, tile thermoelastic deformation and dynamic characteristic coefficient, etc. Part 6th summarizes the work of this paper, points out the shortcomings and needs further study.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TK730.1

【參考文獻(xiàn)】

相關(guān)期刊論文 前2條

1 黎偉;陳志祥;汪久根;;軸線偏斜對多瓦徑向滑動(dòng)軸承熱潤滑性能的影響[J];潤滑與密封;2011年09期

2 黎偉;陳志祥;汪久根;;多瓦可傾瓦徑向滑動(dòng)軸承熱潤滑性能分析[J];潤滑與密封;2011年12期

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本文編號：1638762