国产剪切稀化润滑油成膜特性的研究-农业机械化专业论文.docxVIP

山东理工大学硕士学位论文摘要 山东理工大学硕士学位论文 摘要 万方数据 万方数据 摘要 经典弹流润滑理论能够较精确预测一般矿物油润滑膜厚度而被广泛用于摩擦学设 计。但是对于合成润滑油，由于剪切稀化非牛顿流变特性的存在，导致该类润滑油成膜 能力比经典弹流理论预测值低。实际上机械零部件使用的润滑油通常是由基础油和各种 添加剂组成的合成润滑油，因此，经典弹流润滑理论不再适用于摩擦学设计。 本课题以国产合成润滑油为研究对象，研究剪切稀化非牛顿流变特性对其成膜特性 的影响。首先对实验室现有的纳米级膜厚测量仪进行改进，实现膜厚测量系统的自动调 位和聚集；然后开发设计膜厚分析软件，对油膜膜厚干涉图像进行处理和分析；最后基 于试验数据，得到典型国产润滑油的弹流油膜厚度计算公式。试验研究国产剪切稀化润 滑油成膜机理，为国产润滑油建立更加符合实际应用的理论依据。本文主要进行以下方 面的工作: (1) 对现有的纳米膜厚测量仪器进行改进，实现了显微镜自动调位和聚焦，消除人 为操作的误差，提高干涉图像的测量精度和测量效率，为研究国产润滑油的成膜特性奠 定基础。 (2) 基于 Microsoft Visual C++编程软件，开发设计润滑油膜厚度分析软件，该软件 能排除噪点对膜厚的影响，提高膜厚测量准确度； (3) 基于试验数据，给出典型国产润滑油的弹流油膜厚度公式，并设计相关的试验， 对油膜厚度公式进行验证，进而研究剪切非牛顿流变特性对国产润滑油成模特性的影响。 关键词：国产润滑油；成膜特性；剪切稀化非牛顿流变特性；弹流润滑 I 山东理工大学硕士学位论文 Abstract Abstract For the mineral oils, the film thickness formula of the classical elastohydrodynamic lubrication (EHL) which is broadly used in the research of film-forming properties may be accurate. But, for the synthetic oils, the classical Newtonian EHL gives the higher film thickness than the actual one, because of the shear-thinning rheological properties of oil. In practical application, lubricating oils used in mechanical components are often made up of base oil and various additives. So the classical EHL theories are not applicable to tribology design. This paper considered the domestic synthetic oils as research object and studied the influence of shear-thinning non-Newtonian rheological properties on film-forming characteristics of domestic lubricating oil. Firstly, film thickness measuring instrument was improved, which made the thickness measuring system more automated. Secondly, film thickness analysis software was developed to analyze film thickness interferometric image more accurately. Finally new film thickness formula for domestic oil was obtained based on the test data. Film forming mechanism for domestic oil was studied experimentally. Theorical basis met the practical application was established for domestic oil. The main work of this paper is as follows: In order to improve the