【摘要】：高速離心泵是一種特殊的離心泵，該類型泵采用開式葉輪，與普通離心泵相比，具有機構(gòu)緊湊、零件通用性強、工作可靠、軸向力小、壽命長、揚程曲線平坦等特點，現(xiàn)在已被廣泛用于航天航空、石油化工、化肥、制藥等行業(yè)。該泵高速軸由流體動壓潤滑滑動軸承支承，滑動軸承具有工作平穩(wěn)、可靠、噪音較低、減少摩擦磨損等優(yōu)點，另外，潤滑油膜同時還具有一定的吸振能力，這對提高高速軸運轉(zhuǎn)的穩(wěn)定性和運轉(zhuǎn)精度都是十分有益的。本文圍繞高速離心泵徑向滑動軸承，對其靜特性和動特性進行理論研究，目的是為高速轉(zhuǎn)子支承選用和優(yōu)化提供依據(jù)，并為軸承合理確定配合間隙。論文主要研究工作如下 提出了采用徑向基配點法對Reynolds方程進行求解，該方法這是一種真正的無網(wǎng)格法，采用標準復(fù)合兩次函數(shù)進行插值，編制了Matlab程序，并將所得結(jié)果與經(jīng)典結(jié)論進行對比，，結(jié)果十分吻合，驗證了該方法和編程思想的正確性。 研究了利用徑向基配點法對Reynolds方程求解，得到了徑向滑動軸承的無量綱油膜壓力、承載力、偏位角、端泄量和摩擦力，并分析了偏心率和寬徑比對各項靜特性的影響，然后用此方法計算了高速離心泵徑向滑動軸承的各項靜特性，并對其承載力進行了校核，發(fā)現(xiàn)滿足要求。此算法同時可以用于新的滑動軸承的設(shè)計。 研究了徑向基配點法對擾動壓力方程進行求解，求出了無量綱擾動壓力和滑動軸承的無量綱動特性系數(shù)，并分析了徑向滑動軸承結(jié)構(gòu)參數(shù)的變化對剛度系數(shù)和阻尼系數(shù)的影響，計算了高速離心泵徑向滑動軸承的擾動壓力和在不同偏心率下的動特性系數(shù)。最后分析了油膜失穩(wěn)機理，計算了高速離心泵高速轉(zhuǎn)子不同偏心率下的失穩(wěn)轉(zhuǎn)速。
[Abstract]:High speed centrifugal pump is a kind of special centrifugal pump. This type of pump uses open impeller. Compared with ordinary centrifugal pump, it has the characteristics of compact mechanism, strong generality of parts, reliable work, small axial force, long life, flat head curve, etc. Now has been widely used in aerospace, petrochemical, chemical fertilizer, pharmaceutical and other industries. The high speed shaft of the pump is supported by hydrodynamic lubrication sliding bearing, which has the advantages of smooth operation, reliability, low noise, reducing friction and wear, etc. In addition, the lubricating oil film also has certain vibration absorption ability. This is beneficial to improve the stability and accuracy of high speed shaft operation. In this paper, the static and dynamic characteristics of radial sliding bearing of high speed centrifugal pump are studied theoretically. The purpose of this paper is to provide the basis for the selection and optimization of high speed rotor support, and to reasonably determine the matching clearance for the bearing. The main research work of this paper is as follows: the radial basis collocation method is used to solve the Reynolds equation. This method is a real meshless method. The standard compound quadratic function is used to interpolate, and the Matlab program is compiled. The results are in good agreement with the classical results and verify the correctness of the method and the programming idea. The radial basis collocation method is used to solve the Reynolds equation. The dimensionless oil film pressure, bearing capacity, offset angle, end discharge and friction force of radial sliding bearing are obtained, and the effects of eccentricity and width to diameter ratio on static characteristics are analyzed. Then the static characteristics of radial sliding bearing of high speed centrifugal pump are calculated and its bearing capacity is checked and found to meet the requirements. This algorithm can also be used in the design of new sliding bearings. The radial basis collocation method is studied to solve the disturbance pressure equation. The dimensionless disturbance pressure and dimensionless dynamic characteristic coefficient of sliding bearing are obtained. The influence of structural parameters of radial sliding bearing on stiffness coefficient and damping coefficient is analyzed. The disturbance pressure of radial sliding bearing and the dynamic characteristic coefficient under different eccentricity of high speed centrifugal pump are calculated. Finally, the mechanism of oil film instability is analyzed, and the instability speed of high-speed centrifugal pump rotor under different eccentricities is calculated.
【學(xué)位授予單位】：南京林業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2012
【分類號】：TH133.31;TH311

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