Measurement system for monitoring of vibrations in mechanical devices

Abstract

The ongoing assessment of the technical state of selected mechanical devices requires the use of systems which monitor their operating parameters. As an example, one of the key elements of mechanical devices are bearings, and an important indicator allowing for the assessment of their technical state are the absolute vibration acceleration values for the bearing housing. In the article, we discuss the construction of a system allowing for the monitoring of vibration acceleration signals in mechanical devices using a 3-axial system. In this article, we propose more complex methods of analysis and compare them in terms of effectiveness of assessment of the technical state of the tested device with the methods currently in use. For this reason, for the analysis of vibration signals we used two additional methods based on short-time Fourier transformation (STFT) and Hilbert–Huang transformation (HHT). For all methods, both those used traditionally and those now being proposed, we defined criteria and compared their sensitivity in terms of the assessment of the technical state of the tested object, using the example of a slide bearing.