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Critical evaluation of key data analysis steps in roundness measurements

Kubiak Kamil, Stępień Krzysztof

Mechanik

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2025

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R. 98, nr 5-6

50--54

EN

Analysis of roundness measurement data is fundamental for the assessment of geometric characteristics of cylindrical and spherical objects. This process comprises four essential stages: modelling, filtering, parameterization, and uncertainty budget estimation. The present work focuses on the first three stages, investigating in detail the influence of selected factors and parameters on the final measurement result. Commonly applied assumptions in roundness metrology were also subjected to verification. Research findings confirm, inter alia, that differences in amplitude roundness parameters can reach up to 50% depending on the adopted reference element (circle). Furthermore, a positive influence of applying a Gaussian filter with a broader bandwidth on amplitude parameters was observed, and the effectiveness of utilising the Fourier transform in roundness profile analysis was confirmed.

PL

Analiza danych pomiarowych okrągłości ma kluczowe znaczenie w ocenie cech geometrycznych obiektów cylindrycznych i sferycznych. Proces ten składa się z czterech podstawowych etapów: modelowania, filtrowania, parametryzacji oraz szacowania budżetu niepewności. W artykule skoncentrowano się na pierwszych trzech etapach, dogłębnie analizując wpływ wybranych czynników i parametrów na końcowy wynik pomiaru. Zweryfikowano również powszechnie przyjmowane założenia stosowane w metrologii okrągłości. Wyniki badań potwierdzają między innymi, iż różnice w amplitudowych parametrach okrągłości mogą dochodzić do 50% w zależności od zastosowanego elementu odniesienia. Co więcej, zaobserwowano pozytywną korelację zastosowania filtru Gaussa o szerszym paśmie przepustowości na parametry amplitudowe, jak również potwierdzono skuteczność wykorzystania transformaty Fouriera w analizie profilu okrągłości.

2

Impact of the use of comfort devices on the exhaust toxic compounds from a modern PC car with spark ignition engine

Siedlecki Maciej, Merkisz Jerzy, Dobrzyński Michał, Kubiak Kamil

Combustion Engines

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2022

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R. 61, nr 3

50--55

EN

The use of comfort systems, the number of which in vehicles is constantly increasing, has a direct impact on fuel consumption and engine load. As part of the article, the vehicle's drive in real operating conditions was analyzed in terms of the emission of toxic compounds. The tests were carried out without and with the systems turned on, using the PEMS apparatus, where road emissions of carbon dioxide, carbon monoxide, hydrocarbons, nitrogen oxides and solid particles were measured in terms of mass, number and size distribution of diameters. The track was driven four times with different setting of the powertrain of examined car. The differences concerned the number of comfort systems in the vehicle and the mode of operation of the combustion engine.

3

Designing the optical system with a real time lighting effect control

Kubiak Kamil

Opto-Electronics Review

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2020

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Vol. 28, No. 2

99--105

EN

In the paper, an effective way to design asymmetrical optics for a uniform vertical surface illumination was presented. Assessment of the obtained distribution of luminance (illuminance) on the illuminated surface is done almost at the same time as designing the optical system elements. Advantage of the final application of the presented method in 3D will be independence from the implementation of time-consuming simulations in order to verify the already designed optics. Understanding the method and its application is simple and intuitive. Observing the luminance distribution, created on the illuminated surface almost at the same time as its design, allows to see the effect of adding the next elements of the optical system on this distribution.

4

Impact of the use of comfort devices on the exhaust emission from a hybrid vehicle

Siedlecki Maciej, Merkisz Jerzy, Kubiak Kamil, Rymaniak Łukasz, Dobrzyński Michał, Gallas Dawid

Combustion Engines

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2019

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R. 58, nr 4

280--285

EN

Vehicles are equipped with more and more devices to improve the comfort of traveling. They are usually powered by electricity generated by the engine, which translates into an increase in its loads and, as a consequence, fuel consumption and emission. However, there is no information about the possible increase in the amount of other harmful components contained in the exhaust gases. Often this result is inadequate to that obtained during the operation of the vehicle, where the obtained fuel consumption is higher. As part of this article, tests were carried out in real hybrid vehicle traffic conditions on the same test route using an analyzer from the PEMS (Portable Emission Measurement System) ¬ SEMTECH DS Sensors Inc. The analysis of gaseous components of exhaust gases together with the exhaust mass flow probe and the GPS system made it possible to calculate the pollutant emission. On this basis, the actual mileage fuel consumption of the tested vehicle was calculated using the road emission of carbon-containing compounds (carbon balance method).