计入表面形貌的倾斜轴颈轴承热弹流动力润滑分析动力机械及工程专业论文.docxVIP

优秀毕业论文 精品参考文献资料 计入表面形貌的倾斜轴颈轴承热弹流动力润滑分析 计入表面形貌的倾斜轴颈轴承热弹流动力润滑分析 摘 要 本文主要针对各种机械装置使用最普遍、最基本的直轴一轴承系统中的轴 承，歼展同时计及轴受载变形导致轴颈倾斜、表面形貌和热效应等影响因素的 流体动力润滑分析研究。 联立基于平均流量模型的广义Reynolds方程、三维能量方程和固体热传导 方程等，计算了计及热效应时，不同表面形貌和轴颈倾斜角下的轴承油膜压力、 油膜滚度、油膜反力、端泄流量、摩擦系数和保持轴承稳定工作的力矩。考虑 和不考虑热效应的轴承润滑特性计算结果表明，计入热效应时，表面形貌和润 滑油粘压效应对偏心率较大的轴颈倾斜轴承润滑性能影响较大。 使用ANSYS有限元软件建立了计算有约束整体轴承座轴承表面受热变形 的热柔度矩阵；提出了计算受轴承热变形影响的油膜厚度的新方法。 对轴受载变形时的粗糙表面轴承进行了热弹流动力润滑分析。结果表明： 轴承的热变形在高载荷的情况下对轴承性能的影响较大，计入轴受载变形，影 响更为显萋，且其影响效果会随着转速的增大丽增大，随饕半径间隙的减小面 增大；在本文研究的载荷范围内，无论是否计入轴受载变形，单独考虑轴承表 面的弹性变形时，冀对轴承润滑性能的影响都比较小，而同时考虑轴承的热交 形后，弹性交形的影响会有所增加。 关键词：热变形 弹性变形热效应表面形貌润滑滑动轴承 Thermoelastohydrodynamic Thermoelastohydrodynamic Analysis of Misaligned Plain Journal Bearing with Rough Surface ABSTRACT The hydrodynamic lubrication analysis considered the misaligned journal bearing caused by shaft deformation under load，surface roughness，and thermal effect of shaft—bearing system which is one of the most general and essential pans of support·transmission system in various mechanical devices was studied． The film pressure，film temperature，load·carrying capacity，end leakage flow．rate，frictional coefficient and misalignment moment of a journal bearing with different journal misalignment angle and surface roughness considering thermal effect were calculated based on generalized Reynolds equation，three—dimension energy equation and solid heat conduction equation etc．The results show that it is necessary to take the thermal effect into account in analyzing the lubrication performance of misaligned journal bearing considering surface by comparing the calculating results of lubrication performance of bearing considering thermal effect with those not considering thermal effect．The surface roughness and viscosity—pressure effect of lubricant have a great influence on the lubrication performance of misaligned journal bearing with larger eccentric ratio when considering thermal effect。 The deformation—matrix calculating the thermal deformation of a bearing with some