润滑油膜双色光干涉测量技术的研究

发布时间：2018-01-28 23:47

本文关键词： 润滑油膜测量双色光干涉颜色复现色度学模型 RG结合法　出处：《青岛理工大学》2011年硕士论文　论文类型：学位论文

【摘要】：弹性流体动压润滑（简称弹流润滑）是滚动轴承和齿轮等高副接触机械零件的主要润滑机制，油膜厚度的测量是其研究的基本内容。长期以来，弹流油膜厚度的彩色光干涉测量主要围绕具体的技术应用和仪器设计进行，测量原理的深入研究并不多见。本文针对弹流油膜双色光干涉测量建立了理论模型，对测量原理和条件进行了分析，并以此建立了新的测量技术。基于薄膜光学的多光束干涉理论和摄像系统的光谱响应特性，建立了润滑油膜彩色光干涉测量的色度学模型；以红绿双色光作为输入光源，设计了完整的计算程序以计算光弹流系统的干涉色彩。为验证理论分析的正确，建立了球-盘油润滑静态接触间隙的双色光干涉测量系统，干涉色彩的理论计算和实验测量取得了很好的一致性。对弹流润滑油膜的双色光干涉测量系统的光学特性进行了系统的理论分析。揭示光源功率谱、析光膜厚度、垫层厚度及润滑介质特性对双色光干涉色彩的影响。计算表明，在所用的计算参数条件下，窄的色光带宽、4-10nm的Cr膜厚度会形成较好的干涉图像。使用钢球-盘接触在冲击-卷吸复合运动条件下的油膜厚度的模拟结果，对这一过程进行了双色光干涉的颜色复现模拟，对其测量的图像特征进行了观察。对等温牛顿流体的稳态弹流润滑油膜厚度进行了数值计算，利用该结果对不同卷吸速度和不同载荷下的双色光干涉图像进行了颜色复现模拟，讨论了在不同速度和载荷下的干涉图像的颜色特征。基于以上理论分析，提出了一种新的弹流润滑油膜双色光干涉测量的RG方法，该方法通过对比获得测量点的伪周期数，自动判定待测区域的油膜厚度，理论分析和离线测量表明该方法是可行和实用的。
[Abstract]:Elastohydrodynamic lubrication (EHL) is the main lubrication mechanism of rolling bearing and gear etc. The measurement of oil film thickness is the basic content of its research for a long time. The color light interferometry of elastohydrodynamic oil film thickness is mainly carried out around the specific technical application and instrument design, and the measurement principle is seldom studied. In this paper, a theoretical model is established for the elastohydrodynamic oil film two-color optical interferometry. The principle and condition of measurement are analyzed, and a new measuring technique is established. Based on the multi-beam interference theory of film optics and the spectral response characteristics of the camera system, a colorimetric model for color light interference measurement of lubricating oil film is established. A complete calculation program is designed to calculate the interference color of the photoelastic fluid system using the red and green double color light as the input light source to verify the correctness of the theoretical analysis. A two-color light interference measurement system for static contact clearance lubricated by ball and disk oil is established. The theoretical calculation of interference color is in good agreement with the experimental measurement. The optical characteristics of the two-color optical interferometry system for elastohydrodynamic lubricating oil film are systematically analyzed. The power spectrum of the light source and the thickness of the film are revealed. The influence of cushion thickness and lubricating medium characteristics on the color of two-color light interference. The calculation shows that under the conditions of the calculated parameters, the narrow bandwidth of color light is obtained. A better interference image can be formed when Cr film thickness is between 4 nm and 10 nm. Using the simulation results of the oil film thickness of the steel ball disk contact under the condition of impact-entrainment composite motion, the color reproduction simulation of the two-color light interference is carried out. The measured image characteristics were observed and the thickness of steady elastohydrodynamic lubricating oil film of isothermal Newtonian fluid was calculated numerically. The results are used to simulate the color reproduction of two-color light interference images under different entrainment speeds and loads, and the color characteristics of interference images under different speeds and loads are discussed. Based on the above theoretical analysis, a new RG method for the measurement of two-color optical interference of elastohydrodynamic lubricating oil film is proposed. By comparing the pseudo-period number of measured points, the thickness of oil film in the area to be measured is automatically determined. Theoretical analysis and offline measurement show that this method is feasible and practical.
【学位授予单位】：青岛理工大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH744.3;TH117

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