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Analysis of glass gatherer robot's vibration damping using the original and modified design of the friction damper

Stembalski Marek, Roszkowski Andrzej, Skoczynski Waclaw, Turek Pawel, Fenc Rafal

Journal of Machine Engineering

2020

Vol. 20, No. 4

139--151

This paper presents the results of tests carried out on the glass robot’s lance equipped with a prototype friction damper. Two ways of mounting the damper (the original design and the modified design) are described. A series of experimental tests were carried out for each of the ways of mounting to determine the lance operating conditions at which the damper worked most efficiently. Resonance curves were determined for each of the designs and it was found that the modified structure reduced vibrations to a greater degree, which clearly indicates that the modified solution ensures a higher vibration damping efficiency.

Development of FEM model of an angular contact ball bearing with its experimental verification

Turek Pawel, Skoczynski Waclaw, Stembalski Marek

Journal of Machine Engineering

2019

Vol. 19, No. 4

58--69

The article presents FEM model of an angular contact ball bearing used in spindle systems with active preload control. A two-dimensional replacement model for a single rolling element was developed. Its elastic characteristics were determined and the stress distribution was presented for the FEM 2D model. Based on the elastic characteristics for a single rolling element, a complete 3D bearing was modelled. The substitute model of a bearing developed in this way was used to model the spindle system. The elasticity curve of this spindle was determined. The last stage of the work involved the experimental verification of the FEM model using a custom-built test bench, in which piezoelectric elements were used to preload the bearings.