本文選題：動靜壓軸承 + 階梯效應(yīng)　； 參考：《重慶大學(xué)》2011年碩士論文

【摘要】：隨著現(xiàn)代機械向大型化、高性能、高速化方向發(fā)展,動靜壓徑向軸承在各種旋轉(zhuǎn)機械中已經(jīng)得到了廣泛的應(yīng)用。動靜壓軸承承載力大,運行穩(wěn)定可靠,潤滑性能直接影響到軸承所支承的機器運行的可靠性和壽命。目前,國內(nèi)外許多學(xué)者也在積極開展動靜壓軸承的研究工作,但迄今為止,對于動靜壓軸承的研究尚處于探索階段,還沒有形成相對完善、成熟的理論方法。為了更為有效的利用動靜壓軸承,研究動靜壓軸承的內(nèi)部運行機理和特性,進(jìn)而優(yōu)化動靜壓軸承的結(jié)構(gòu)設(shè)計十分必要。 本文重點展開對基于毛細(xì)管節(jié)流的動靜壓軸承特性的研究,主要研究內(nèi)容和成果包括以下幾個方面: ①分析基于毛細(xì)管節(jié)流的階梯腔動靜壓軸承組成及工作原理,并比較階梯腔軸承較其它腔形動靜壓軸承和動壓軸承能形成更好的階梯腔動壓效應(yīng)。建立軸承-主軸系統(tǒng)力學(xué)性能的數(shù)學(xué)模型。 ②基于MATLAB軟件,用有限元法對階梯腔動靜壓軸承的壓力分布進(jìn)行求解,計算軸承油膜壓力分布;比較階梯腔動靜壓軸承的階梯腔深度變化對油膜壓力分布的影響,并求出具有最佳階梯效應(yīng)的滑動軸承的階梯腔深度。 ③論述了動靜壓軸承動力系數(shù)(油膜剛度系數(shù)和油膜阻尼系數(shù))的形成機理,并利用有限差分法求出了8個動力特性系數(shù)。最后根據(jù)所求出的動力系數(shù),對軸承進(jìn)行了穩(wěn)定性判斷。 ④在GAMBIT中建立模擬動靜壓階梯腔軸承內(nèi)部三維流動的數(shù)學(xué)模型及邊界條件,并利用FLUENT軟件,選用層流模型,分離式求解器對軸承的壓力分布和溫度分布進(jìn)行求解。通過計算實例比較,用FLUENT計算的壓力分布和溫度分布與數(shù)值法計算的結(jié)果相近,與實際運行工況比較符合。并分析了軸承的偏心率變化時對最大壓力、最大溫升、承載力及偏位角的影響。 本文開展的基于毛細(xì)管節(jié)流的階梯腔動靜壓軸承的研究方法和研究成果,對于開發(fā)新型的動靜壓軸承可提供參考,對動靜壓軸承的結(jié)構(gòu)設(shè)計及運行狀況的研究具有指導(dǎo)意義。
[Abstract]:With the development of modern machinery in the direction of large scale, high performance and high speed, the hydrostatic radial bearing has been widely used in all kinds of rotating machinery. The bearing capacity of the bearing is large, the operation is stable and reliable, and the lubricating performance directly affects the reliability and life of the machine supported by the bearing. At present, many scholars at home and abroad are also actively carrying out the research work of the static and static bearing, but so far, the research of the dynamic and static bearing is still in the exploratory stage, and has not yet formed a relatively perfect and mature theoretical method. In order to make more effective use of the hydrostatic bearing, it is necessary to study the internal operation mechanism and characteristics of the dynamic and static bearing, and then optimize the structure design of the static and static bearing. This paper focuses on the study of the characteristics of the hydrostatic bearing based on capillary throttling. The main research contents and achievements are as follows: 1. The composition and working principle of the stepped hydrostatic bearing based on capillary throttling are analyzed. Compared with other cavity hydrostatic bearing and dynamic bearing, the step cavity bearing can form better dynamic pressure effect. The mathematical model of mechanical properties of bearing-spindle system is established. 2 based on MATLAB software, the pressure distribution of stair hydrostatic bearing is solved by finite element method, and the oil film pressure distribution of bearing is calculated. The influence of the depth of the stepped cavity on the oil film pressure distribution is compared. The depth of step cavity of sliding bearing with optimum step effect is obtained. 3 the forming mechanism of dynamic coefficient (oil film stiffness coefficient and oil film damping coefficient) of hydrostatic bearing is discussed. Eight coefficients of dynamic characteristics are obtained by using the finite difference method. Finally, according to the calculated dynamic coefficient, the stability of the bearing is judged. 4 the mathematical model and boundary conditions of simulating the three-dimensional flow in the static and static pressure stepped cavity bearing are established in gambit, and the laminar flow model is selected by using fluent software. The pressure distribution and temperature distribution of the bearing are solved by a separate solver. Through the comparison of calculation examples, the pressure distribution and temperature distribution calculated by fluent are close to those calculated by numerical method, and are in good agreement with the actual operating conditions. The influence of the eccentricity of bearing on the maximum pressure, maximum temperature rise, bearing capacity and deviation angle is analyzed. In this paper, the research methods and results of step cavity hydrodynamic bearing based on capillary throttling can provide reference for the development of new type of static and dynamic bearing, and have guiding significance for the research of the structure design and operation condition of the static and dynamic bearing.
【學(xué)位授予單位】：重慶大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2011
【分類號】：TH133.36

【引證文獻(xiàn)】

相關(guān)期刊論文 前1條

1 楊建璽;周浩兵;崔鳳奎;;液體動靜壓軸承油腔結(jié)構(gòu)對承載特性的影響[J];河南科技大學(xué)學(xué)報(自然科學(xué)版);2012年05期

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本文編號：2096948