Analiza systemów zbierania danych pomiarowych z urządzeń do badań tribologicznych

Abstract

When conducting tribological model studies with the aim of achieving a high repeatability and reproducibility of results, much attention is paid to the precise setting of test parameters. Most of all, setting the sliding speed and normal load is made with great care. Ambient conditions (temperature, humidity) are also controlled. At the same time, issues related to inaccuracy in making samples are often marginalized. Inaccuracies in surface geometric texture and shape are often caused by additional technological processes carried out after a precise execution of the sample base. This often increases the axial and radial run-out of samples. Moreover, it may lead to a misinterpretation of the measurement of linear wear intensity and friction. In order to eliminate the impact of the axial run-out on the measurement of linear wear intensity, the authors have developed a concept as well as designed and built an automated computer-controlled system of triggering the measurement of tribological characteristics as a function of a disc position, which is no longer as a function of time. This system was applied in the system of the T-01M produced by ITeE – PIB Radom. The modified system was tested on two types of material combinations and with a high variability of the speed of the node. In addition, the results of tribological characteristics obtained with a standard measuring system triggered with time were compared with those obtained using the developed system. The study shows that the use of an automated system of triggering measurement as a function of a disc position enables a considerable decrease in scattering measurement results at low engine speeds, thereby improving repeatability and reproducibility of tribological studies in the system ball-on-disc and pin-on-disc.