数字图像处理技术在磨损表面测量中的应用研究

T. Shashikala, B. L. Sunitha, S. Basavarajappa, J. Davim
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引用次数: 0

摘要

数字图像处理(DIP)通过快速、频繁和非接触的识别和测量方法,成为分析工程问题的常用工具。本研究尝试用该方法对材料表面的磨损区域进行自动检测和测量。黄铜材料已被用于实验,因为它通常被用作轴承材料。在保持滑动距离和滑动速度不变的情况下,采用针盘式干滑动磨损试验机,施加10 - 50牛的载荷进行试验。经测试,采用1/2英寸行间传输CCD图像传感器,以795(H)[公式:见文]896(V)空间分辨率8.6[公式:见文][公式:见文]m (H)[公式:见文]8.3[公式:见文][公式:见文]m (V)单元格获取图像。去噪去除任何可能的噪声,然后进行对比度拉伸以增强图像以提取磨损区域。使用分割工具通过识别大于阈值的白色区域来划分磨损和未磨损区域,目的是量化被测试样的磨损表面。精密的边缘检测和粒度测定技术已被用于量化磨损区域。结果表明,在一定滑动速度和滑动距离下,比磨损率随载荷的增大而增大。同样,DIP识别的磨损区面积也从42.7%增加到69.97%。这是因为在磨损的材料中形成了更深的凹槽。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Some Studies on Measurement of Worn Surface by Digital Image Processing
Digital image processing (DIP) becomes a common tool for analyzing engineering problems by fast, frequent and noncontact method of identification and measurement. An attempt has been made in the present investigation to use this method for automatically detecting the worn regions on the material surface and also its measurement. Brass material has been used for experimentation as it is used generally as a bearing material. A pin on disc dry sliding wear testing machine has been used for conducting the experiments by applying loads from 10 N to 50 N and by keeping sliding distance and sliding speed constant. After testing, images are acquired by using 1/2 inch interline transfer CCD image sensor with 795(H)[Formula: see text]896(V) spatial resolution of 8.6[Formula: see text][Formula: see text]m (H)[Formula: see text]8.3[Formula: see text][Formula: see text]m (V) unit cell. Denoising has been done to remove any possible noise followed by contrast stretching to enhance image for wear region extraction. Segmentation tool was used to divide the worn and unworn regions by identifying white regions greater than a threshold value with an objective of quantifying the worn surface for tested specimen. Canny edge detection and granulometry techniques have been used to quantify the wear region. The results revel that the specific wear rate increases with increase in applied load, at constant sliding speed and sliding distance. Similarly, the area of worn region as identified by DIP also increased from 42.7% to 69.97%. This is because of formation of deeper groves in the worn material.
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