Using of laser vibrometers in vibration measurement systems brings additional benefits due to the lack of impact of the sensor on the tested measuring system. Recently, leading rolling bearing manufacturers are equipping their diagnostic measuring systems with non-contact sensors. Doppler laser vibrometers are used interchangeably for electrodynamic sensors. This paper attempts to assess the vibrometer in use for measuring vibration of rolling bearings in industrial conditions.
This paper assesses the impact of certain parameters of a wavelet transform on the 3D surface decomposition process regarding transform's application to divide components of surface texture. The tests focused on determination of the relation between horizontal sampling density, type of mother wavelet and level of wavelet decomposition. The analysis included samples manufactured with use of the SLM additive technology. Sample surface measurements were performed by Talysurf CCI optical profilometer, applying specified sampling density depending on an objective type being used. The obtained 3D profiles were filtered with use of selected mother wavelets. The paper also covers the analysis of the impact of a mother wavelet type on values of selected 3D surface roughness parameters. The obtained results were subject to statistical analysis.
Spherical elements constitute significant group of machine parts. In particular, they are commonly applied in bearing industry. Spherical elements should be usually manufactured very precisely and their form deviations are relatively small. Deviations of balls used in rolling bearings usually do not exceed 1 micrometer. The problem of accurate measurement of spherical parts is complicated and standards do not provide too many recommendations referring to this problem. The paper presents up-to-date solutions of the problem of measurements of spherical parts. It also presents the method of sphericity measurements developed at Kielce University of Technology. In addition, measurement strategies are presented that are based on developed method.
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