Details
| Original language | English |
|---|---|
| Title of host publication | 10th International Symposium on Measurement and Quality Control 2010, ISMQC 2010 |
| Pages | 47-50 |
| Number of pages | 4 |
| Publication status | Published - 2010 |
| Event | 10th International Symposium on Measurement and Quality Control 2010, ISMQC 2010 - Osaka, Japan Duration: 5 Sept 2010 → 9 Sept 2010 |
Abstract
Modifying the surface of highly loaded materials like cylinders of piston engines is a method of minimising wear and friction. There are already coatings like Alusil, that are used in the cylinders of some combustion engines. The advantage of this coating are the very hard silicon particles, that are raised compared to the aluminium matrix, in which the silicon is embedded. Below the silicon particles there is volume to store oil improving the tribological performance. Another new method of modifying a surface for this purpose is a cutting process, which can produce structures with a scale from a few micrometers to some millimetres. The lateral dimension of these microstructures can be up to a few millimetres, which complicates the measurement and data pre-processing. There are several methods of measuring the surface of these structures in order to acquire more properties. In this paper several methods of measurement data preprocessing are presented, which are necessary before the properties of the microstructures can be evaluated. A method to stitch a single microstructure, using several high resolution measurements with an areal profilometer like a white light interferometer, is shown. The principle is based on properties of the structure and does not depend on the information of the relative shift of each measurement. Microstructures can be integrated within flat but also within curved materials like the inner surface of a piston cylinder. The form of this cylinder has to be removed from the measurement data. A common way of removing the form is a least square fit with an appropriate polynomial with a degree of two. But since the microstructures have such a large lateral dimension, the surface fit is strongly influenced by the microstructures that results in an inaccurate fit. The proposed method uses a segmentation step, which recognises the microstructures even in the measurement data including the form. Then the microstructures are removed from the surface and the fit is applied to the surface without the microstructures. This fit does contain the correct form of the cylinder. Afterwards the fitted surface is removed from the surface with the microstructures. The result is a robust surface fitting method.
Keywords
- Pre-processing, Robust surface fitting, Roughness metrology, Segmentation, Stitching
ASJC Scopus subject areas
- Engineering(all)
- Safety, Risk, Reliability and Quality
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10th International Symposium on Measurement and Quality Control 2010, ISMQC 2010. 2010. p. 47-50.
Research output: Chapter in book/report/conference proceeding › Conference contribution › Research › peer review
}
TY - GEN
T1 - 3D Measurments of microstructures with large lateral dimensions
AU - Bretschneider, M.
AU - Krauß, Moritz
AU - Kästner, Markus
AU - Reithmeier, Eduard
PY - 2010
Y1 - 2010
N2 - Modifying the surface of highly loaded materials like cylinders of piston engines is a method of minimising wear and friction. There are already coatings like Alusil, that are used in the cylinders of some combustion engines. The advantage of this coating are the very hard silicon particles, that are raised compared to the aluminium matrix, in which the silicon is embedded. Below the silicon particles there is volume to store oil improving the tribological performance. Another new method of modifying a surface for this purpose is a cutting process, which can produce structures with a scale from a few micrometers to some millimetres. The lateral dimension of these microstructures can be up to a few millimetres, which complicates the measurement and data pre-processing. There are several methods of measuring the surface of these structures in order to acquire more properties. In this paper several methods of measurement data preprocessing are presented, which are necessary before the properties of the microstructures can be evaluated. A method to stitch a single microstructure, using several high resolution measurements with an areal profilometer like a white light interferometer, is shown. The principle is based on properties of the structure and does not depend on the information of the relative shift of each measurement. Microstructures can be integrated within flat but also within curved materials like the inner surface of a piston cylinder. The form of this cylinder has to be removed from the measurement data. A common way of removing the form is a least square fit with an appropriate polynomial with a degree of two. But since the microstructures have such a large lateral dimension, the surface fit is strongly influenced by the microstructures that results in an inaccurate fit. The proposed method uses a segmentation step, which recognises the microstructures even in the measurement data including the form. Then the microstructures are removed from the surface and the fit is applied to the surface without the microstructures. This fit does contain the correct form of the cylinder. Afterwards the fitted surface is removed from the surface with the microstructures. The result is a robust surface fitting method.
AB - Modifying the surface of highly loaded materials like cylinders of piston engines is a method of minimising wear and friction. There are already coatings like Alusil, that are used in the cylinders of some combustion engines. The advantage of this coating are the very hard silicon particles, that are raised compared to the aluminium matrix, in which the silicon is embedded. Below the silicon particles there is volume to store oil improving the tribological performance. Another new method of modifying a surface for this purpose is a cutting process, which can produce structures with a scale from a few micrometers to some millimetres. The lateral dimension of these microstructures can be up to a few millimetres, which complicates the measurement and data pre-processing. There are several methods of measuring the surface of these structures in order to acquire more properties. In this paper several methods of measurement data preprocessing are presented, which are necessary before the properties of the microstructures can be evaluated. A method to stitch a single microstructure, using several high resolution measurements with an areal profilometer like a white light interferometer, is shown. The principle is based on properties of the structure and does not depend on the information of the relative shift of each measurement. Microstructures can be integrated within flat but also within curved materials like the inner surface of a piston cylinder. The form of this cylinder has to be removed from the measurement data. A common way of removing the form is a least square fit with an appropriate polynomial with a degree of two. But since the microstructures have such a large lateral dimension, the surface fit is strongly influenced by the microstructures that results in an inaccurate fit. The proposed method uses a segmentation step, which recognises the microstructures even in the measurement data including the form. Then the microstructures are removed from the surface and the fit is applied to the surface without the microstructures. This fit does contain the correct form of the cylinder. Afterwards the fitted surface is removed from the surface with the microstructures. The result is a robust surface fitting method.
KW - Pre-processing
KW - Robust surface fitting
KW - Roughness metrology
KW - Segmentation
KW - Stitching
UR - http://www.scopus.com/inward/record.url?scp=84871541657&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:84871541657
SN - 9781617820199
SP - 47
EP - 50
BT - 10th International Symposium on Measurement and Quality Control 2010, ISMQC 2010
T2 - 10th International Symposium on Measurement and Quality Control 2010, ISMQC 2010
Y2 - 5 September 2010 through 9 September 2010
ER -