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1
Content available Sampling Interval Selection for 3D Surface Roughness Measurements Using the Contact Method
Żyłka Wojciech Marek
Advances in Science and Technology. Research Journal
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2021
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Vol. 15, no 4
283--298
EN
The article presents the impact of sampling interval ΔX=ΔY upon the precision of parametrical assessment of roughness of selected surfaces. Moreover this study introduces theoretical analysis of sampling interval selection based on analysis of the probability of covering an unordered set of extreme points of surface with an ordered set of measurement points. As the result, the final formula was formulated, which enables to calculate the maximum sampling rate ΔX=ΔY. This guarantees a full 100% coverage of the vertices examined by the unevenness of the measuring grid.
2
Content available ANSDM converters dynamic range design process
Golański Ryszard, Godek Juliusz
Science, Technology and Innovation
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2020
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Vol. 10, no. 3
1--7
EN
The results of analytic and simulating works proved that for nonstationary sources, the delta converters with adaptive sampling expose higher coding efficiency than the former proposals, based on uniform sampling methods. The knowledge of the sampling interval range and the algorithm of the Nonuniform Sampling Delta Modulation and Adaptive Nonuniform Sampling Delta Modulation allows finding the necessary number of the sampling intervals and their values that maximizes SNR. The total dynamic range of the ANSDM modulator is the product of the dynamic range both from sampling interval and step size adaptation. Due to the high complexity of the calculations, the ANSDMsoft program was developed to support computing. All computational works were carried out using the Maple environment. Maple allows to solve complex mathematical functions and display their results in a simple way. Most importantly, it supports the LambertW function, used in the computing of NSDM or ANSDM modulators parameters. Graphic illustrations of the NSDM and ANSDM modulator dynamic range as a function of the minimum and maximum sampling frequency are presented.
3
Content available remote Optimization of measurement and analysis parameters of burnishing surfaces
Łętocha A., Miller T., Kalisz J.
Mechanik
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2017
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R. 90, nr 11
1030--1034
PL
Przedstawiono badania związane z optymalizacją pomiarów chropowatości dla topografii powierzchni uzyskanych poprzez frezowanie, a następnie nagniatanie utwardzonego stopu aluminium. Pomiary wykonano profilometrem stykowym TOPO 01. Wybrano najlepsze parametry pomiaru. Wykonano także dodatkowe pomiary z wybraną konfiguracją, analizę struktury geometrycznej powierzchni oraz sporządzono statystykę parametrów chropowatości profilu.
EN
Studies related to the optimization of roughness measurements for surface topography obtained by milling and subsequent burnishing of hardened aluminum alloys, are presented. The measurements were made using the TOPO 01 contact profilometer. The best measurement parameters were selected. Additional measurements were also made with selected configuration, geometric surface analysis, and profile roughness statistics.
4
Content available The effect of sampling interval on the predictions of an asperity contact model of two-process surfaces
Pawlus P., Reizer R., Wieczorowski M., Żelasko W.
Bulletin of the Polish Academy of Sciences. Technical Sciences
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2017
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Vol. 65, nr 3
391--398
EN
Contact of random machined two-process steel textures with a smooth, flat steel surface is discussed in this paper. Two-process surfaces were machined by vapour blasting followed by lapping. An elastic-plastic contact model was applied, assuming distributed radius of asperities. Calculation procedures allowed the mean surface separation, contact pressure, and area fraction to be computed as functions of sampling intervals. Parameters characterizing the summits important in contact mechanics were calculated for different sampling intervals. Plasticity index of two-process textures was calculated using the modified procedure. It was found that the influence of sampling interval on normal contact depended on the rough surface ability to plastic deformation. The use of a traditional method of calculation overestimated the plasticity index. Peaks from plateau surface region governed contact characteristics of two-process surfaces.
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