面接触润滑测量系统油膜厚度自动计算方法  

An Automatic Approach to compute the Film Thickness in a Slider-on-Disc Conformal-contact Lubricating Film Measurement System

作　　者：白清华[1,2] 郭峰[2] 田鹏晖 BAI Qinghua GUO Feng TIAN Penghui(School of Computer Engineering, Qingdao University of Technology, Qingdao Shandong 266520, China School of Mechanical Engineering, Qingdao University of Technology, Qingdao Shandong 266520, China)

机构地区：[1]青岛理工大学计算机工程学院,山东青岛266520 [2]青岛理工大学机械工程学院,山东青岛266520

出　　处：《润滑与密封》2017年第1期34-40,共7页Lubrication Engineering

基　　金：国家自然科学基金项目(51275252);教育部博士点基金项目(20133721110002)

摘　　要：为了解决面接触润滑油膜光干涉测量系统人工计算油膜厚度效率低下的问题,提出光强数据的高效处理算法,实现油膜厚度的自动计算。通过理论和实验验证多光束干涉理论应用于滑块-玻璃盘面接触副的可行性。对整周期内的光强分布进行区域定义,应用Freeman方向链码和均值滤波对数据曲线进行分段光滑,设计基于阈值的归一算法,通过模板对比算法,得到光强曲线的始末端形态,自动计算出光强数据所属区域Ⅰ和Ⅱ的数量,实现干涉级次的准确计算;以该方法编写程序应用于实际测量,结果与手动计算的油膜厚度有很好的一致性。To overcome the low efficiency in artificial estimation of the film thickness in an optical slider-on-disc lubricating film tester, a robust algorithm was proposed to recognize interference intensity variation and its order change,which enables automatic measurement of film thickness.Theoretical and experimental results show that the multl-beam interference principle can be applied to the film thickness measurement in the slider-on-disc contact, and the interference intensity profile can be divided into regions I and II within one film thickness period.Freeman chain code and simple moving average filter technique were used to smooth the data.A normalization algorithm based on threshold value was proposed for determining in which region the data are,and the interference order can be obtained accurately.A template matching method was used to infer the shape of the start and the end areas.This approach was applied to process measured data in the experiments, and results were in good agreement with the oil film thickness calculated by the old method.

关 键 词：光干涉 油膜厚度 Freeman方向链码 模板对比 

分 类 号：TH117[机械工程—机械设计及理论]