Przemysław Podulka , Wojciech Macek , Robert Owsiński , Ricardo Branco , Jarosław Trembacz
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Some advantages of profile data extraction in selected directions, like horizontal, vertical or crack, were found deficient, even in studies by various functions, like autocorrelation, power spectral density, or texture direction ratio. When noise suppression methods depend on the details studied, boundary areas were extracted to compare and highlight the presence of high-frequency data characteristics. The proposed method was validated when contrasting standardised Gaussian or median filtering techniques with the spline filtering approach. A proper filter for the reduction of vibrational noise from the results of FVM topography measurements was suggested based on the proposed procedure. 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引用次数: 0
摘要
本文研究了疲劳弯曲试验后 6082 铝合金试样的形貌,并对振动引起的测量噪声进行了综合评估。粗糙度结果是通过非接触式焦点变化显微镜(FVM)获得的。研究数据经过预处理,分别用常规方法去除非测量点和异常值,并考虑了高频噪声。研究了 ISO 25178 粗糙度参数的变化。根据之前的研究发现,在分析选定带宽内的测量噪声时,疲劳弯曲测试后的表面可能难以考虑。即使在使用自相关、功率谱密度或纹理方向比等各种函数进行研究时,也发现在选定方向(如水平、垂直或裂纹)上提取轮廓数据的一些优势并不明显。当噪声抑制方法取决于所研究的细节时,提取边界区域来比较和突出高频数据特征的存在。将标准化的高斯或中值滤波技术与样条滤波方法进行对比,验证了所提出的方法。根据所提出的程序,建议了一种适当的滤波器,用于减少 FVM 地形测量结果中的振动噪声。最后,还提出了如何使用新方法减少疲劳弯曲试验后试样表面形貌中高频测量噪声造成的误差。
Roughness measurement results evaluation of 6082 aluminium alloy specimens after fatigue bending tests
In this paper, the topography of 6082 aluminium alloy specimens after fatigue bending tests was studied with a comprehensive evaluation of measurement noise caused by vibration. Roughness results were acquired by contactless Focus Variation Microscopy (FVM). Studied data were pre-processed, removing the non-measured points and outliers with regular methods, respectively, and high-frequency noise was considered. The variations in ISO 25178 roughness parameters were studied. Based on the previous studies, it was found that surfaces after fatigue bending tests can be difficult to consider when analyzing the measurement noise in a selected bandwidth. Some advantages of profile data extraction in selected directions, like horizontal, vertical or crack, were found deficient, even in studies by various functions, like autocorrelation, power spectral density, or texture direction ratio. When noise suppression methods depend on the details studied, boundary areas were extracted to compare and highlight the presence of high-frequency data characteristics. The proposed method was validated when contrasting standardised Gaussian or median filtering techniques with the spline filtering approach. A proper filter for the reduction of vibrational noise from the results of FVM topography measurements was suggested based on the proposed procedure. Finally, it was proposed how use the new method for reducing errors caused by high-frequency measurement noise in the surface topography of specimens after fatigue bending tests.
期刊介绍:
Precision Engineering - Journal of the International Societies for Precision Engineering and Nanotechnology is devoted to the multidisciplinary study and practice of high accuracy engineering, metrology, and manufacturing. The journal takes an integrated approach to all subjects related to research, design, manufacture, performance validation, and application of high precision machines, instruments, and components, including fundamental and applied research and development in manufacturing processes, fabrication technology, and advanced measurement science. The scope includes precision-engineered systems and supporting metrology over the full range of length scales, from atom-based nanotechnology and advanced lithographic technology to large-scale systems, including optical and radio telescopes and macrometrology.