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  本文關鍵詞：唇形密封圈潤滑性能及對轉子動力學性能影響研究　出處：《華東理工大學》2013年博士論文　論文類型：學位論文

  更多相關文章： 唇形密封圈 潤滑性能 密封性能 數(shù)值模擬 轉子動力學性能

【摘要】：唇形密封圈是機械設備中的重要元件,其密封性能的好壞直接影響到機械設備的使用效果和使用壽命。在正常工作時,唇形密封圈的密封唇和軸之間通常會形成一層很薄的流體動壓油膜。以往關于唇形密封圈流體動壓潤滑的研究中,很少有考慮兩接觸表面的微觀隨機形貌,在分析流體動壓時沒有考慮橡膠密封唇口表面微凸體的初始彈性變形以及轉動過程的形貌隨機變化,在數(shù)值計算研究中沒有考慮過盈量對密封圈潤滑和泄漏性能的影響。此外,也未見有人研究唇形密封圈對轉子系統(tǒng)振動性能的影響。針對這些問題,本文以唇形密封圈為研究對象展開研究,采用數(shù)值模擬和試驗研究相結合的方法,深入研究了唇形密封圈的潤滑性能和密封性能,研究了唇形密封圈對轉子動力學性能的影響。 本文的主要研究內容和取得的成果包括：采用基于AR模型的二維數(shù)字濾波技術和基于隨機過程和時間序列模型的粗糙表面計算機模擬方法,構造了粗糙表面的指數(shù)自相關函數(shù),模擬出密封唇和軸表面的三維隨機粗糙表面；建立了密封圈和軸過盈接觸的有限元模型,計算出密封唇的徑向變形系數(shù)矩陣和切向變形矩陣；提出并構建了一種能夠同時考慮密封唇和軸表面微觀形貌、密封唇過盈量、密封唇的彈性變形等因素的流體動壓潤滑性能的數(shù)值模擬計算方法。對唇形密封圈進行了數(shù)值模擬研究,計算并分析了不同初始過盈量下流體潤滑性能的變化規(guī)律；建立了一種能夠同時考慮唇口過盈量、密封壓力以及密封區(qū)域寬度方向各截面潤滑油流量波動等因素的唇形密封圈泄漏率的數(shù)值模擬計算方法；建立了能夠對軸的安裝偏心量和密封圈初裝間隙對密封圈性能影響進行計算的方法,分析了不同過盈量、密封壓力和安裝偏心量下唇形密封圈的潤滑、密封性能；在考慮密封圈和軸的表面形貌變化、安裝過盈量、密封圈和軸接觸位置、接觸角度、接觸寬度變化、以及溫度對潤滑油粘度影響的前提下,應用Reynolds方程和“全局熱平衡法”,構建了唇形密封圈熱流體動力潤滑數(shù)值模擬計算方法,計算研究了不同轉速和不同初始過盈量下唇形密封圈油膜厚度、油膜壓力、摩擦力、發(fā)熱量、溫度、泄漏率等一系列參數(shù)的變化規(guī)律；采用傳遞矩陣法構建了“軸承-轉子-密封”系統(tǒng)的動力學模型,計算了“軸承-轉子-密封”系統(tǒng)彎曲振動的固有頻率、阻尼衰減因子和模態(tài)振型,并分析了葉輪和帶輪的偏心不平衡量對系統(tǒng)不平衡響應振幅的影響。通過對“軸承-轉子-密封”系統(tǒng)和“軸承-轉子”系統(tǒng)的振動性能的比較,分析了唇形密封圈對轉子動力學性能的影響；試驗研究了不同過盈量對密封系統(tǒng)的溫升、密封圈與軸接觸面間摩擦力等性能參數(shù)的影響規(guī)律,并將試驗所測得的數(shù)據(jù)與理論計算結果進行比較,在一定程度上證明了本文數(shù)值模擬研究成果的可靠性。 本文的研究內容和取得的成果將可以為唇形密封圈性能的進一步研究以及在工業(yè)中的實際應用提供重要的理論支撐。
[Abstract]:Lip seal is an important component of the mechanical equipment, the sealing performance will directly affect the mechanical equipment use effect and service life. In normal operation, usually between the lip and shaft seal will form a very thin layer of fluid dynamic pressure oil film lip seal. The previous research on lip seal fluid dynamic pressure lubrication, seldom consider the micro morphology of two random contact surface morphology, random changes in the initial elastic analysis of hydrodynamic pressure without considering the rubber seal lip surface asperity deformation and rotation process, the numerical calculation research did not consider in the influence of the amount of interference of sealing ring lubrication and leakage performance. In addition, there is also no influence on the vibration performance of rotor system of lip seal. Aiming at these problems, based on the lip seal for research object, numerical simulation and experiment research In this method, the lubrication and sealing properties of the lip seal are studied, and the influence of the lip seal ring on the dynamic performance of the rotor is studied.
The main research contents and achievements include: using two-dimensional digital filter technology of AR model and rough surface computer random process and time series model based on simulation method based on the structure of rough surface with exponential autocorrelation function, simulate the lip seal and the shaft surface three dimensional random rough surface; a finite element sealing ring and the axial interference contact model, calculate the radial lip seal deformation coefficient matrix and tangential deformation matrix; puts forward a can also consider the sealing lip and shaft surface morphology, sealing lip interference, fluid lip deformation factors such as dynamic pressure lubrication properties of the numerical simulation method the sealing ring on the lip. Through numerical simulation, analysis of the variation between the interference under fluid lubrication performance and calculation; to establish a new test at the same time Considering the lip interference, method of numerical computation and factors of sealing pressure sealing area width direction of each section of oil flow fluctuation lip seal leakage rate; establish a method that can calculate the effect on the seal performance of the shaft installed eccentricity and seal installation clearance, analyzes the different interference the amount of lubrication, sealing, pressure and volume under the installation eccentric lip seal sealing performance; considering the surface morphology of the sealing ring and the shaft changes, installation amount of interference, the sealing ring and the shaft contact location, contact angle, contact width change, the premise and the influence of temperature on viscosity of lubricating oil under the application of Reynolds equation and "the global heat balance method, constructed the lip seal ring thermal hydrodynamic lubrication numerical simulation calculation method, calculation of different speed and different initial interference under the lip seal oil film thickness, oil film pressure, The friction, heat, temperature variation, leakage rate and a series of parameters; using the transfer matrix method to build a dynamic model of rotor bearing seal system, calculate the rotor bearing seal system of bending vibration frequency, damping factor and modal analysis, and the impeller and the pulley eccentric unbalance unbalance response of the system is studied. By comparing the amplitude of vibration performance of rotor bearing seal system and rotor bearing system, analyzes the lip seal on the performance of the rotor dynamics influence; experimental research on different amount of interference of the sealing system of temperature L, influence of contact surface between the friction ring and the shaft sealing performance parameters, and comparing the measured data and the calculated results of the test, to a certain extent, proved that the numerical simulation results can By sex.
The research contents and achievements of this paper will provide important theoretical support for further research on the performance of lip seal and practical application in industry.

【學位授予單位】：華東理工大學
【學位級別】：博士
【學位授予年份】：2013
【分類號】：TH136

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