毕业论文移动版

摘要：为了研究微造型对髋关节表面动压润滑性能的影响，提高动压润滑效果。本文结合股骨头-髋臼的实际工况，利用gambit软件建立具有不同微截面特征的有限元模型，通过控制织构的深度，半径，不同截面形状以及不同流速等参数，使用fluent14.5软件进行后处理计算等步骤进行研究，结果表明：（1）控制几何参数的不变（相同的工况下），单考虑形状的变化，椭圆截面的微造型表现出来的动压效果最好，油膜承载力越好；（2）针对织构的半径进行了模拟计算，结果表明织构半径越大，上壁面的动压润滑效果越好，因此不存在最优值的假设；（3）润滑剂速度越大，上壁面动压润滑效果越好（4）针对织构的深度进行了box-behnken设计实验，得出最优的参数组合为：半径0.3mm，深度0.04mm，椭圆形截面，此时最大的压力响应值为5098.79pascal。

关键词：微织构；动压润滑性能；参数优化

Abstract：In order to study and enhance the effects of dynamic lubrication performance of micro texture on hip joint surface, the research was made primarily through  the  way  of combining the actual working conditions of acetabular-head, and building finite element model with different microsection characteristics by the use of GAMBIT software. After those parameters were controlled, such as the depth, the diameters, different cross-sections, and different speed of the surface texture, and the post-processing calculation was down by the use of FLUENT 4.5 software, the conclusions had been drawn and are shown as follows: (1) In the event of invariant geometric parameters ( the same working conditions), we could only consider the change of the shapes, so that the dynamic lubrication performance of the micromodelling with elliptic sections is best, and its oil film support capacity is better.(2)The simulating calculation was down to probe the radius of the texture, so that the result could be concluded that the dynamic lubrication performance on the upper surface will be better, when the radius of the texture is larger. Therefore, there is no existence of the hypothesis of the optimal value.(3)The dynamic lubrication performance on the upper surface will be better, when the lubrication moves faster.(4)The Box-Behnken experimental design was carried out to probe the depth of the texture, so that the result could be concluded that the optimal parameter combination is consistent with a 0.1-mm radius, a 0.04-mm depth and a elliptical section. And at this time, the maximum stress response value is 5098.79N.

Keywords: micro texture；Dynamic Lubrication Performance；parameter optimization

目录

第一章绪论 1

1.1选题背景 1

1.2国内外研究现状 1

1.3动压原理、研究目的、研究内容、研究意义 4

1.3.1凹坑流体动压形成原理 4

1.3.2研究目的 5

1.3.2研究内容 5

1.3.3研究意义 6

第二章钛合金微织构表面流体动压润滑性能研究 7

2.1 单点微织构单因素设计方案 7

2.2 方法、目标参数 7

2.3 工具设置步骤、工艺参数、尺寸 7

2.4 FLUENT相关计算条件的设定 8

2.5 (责任编辑：qin)