Basics of Vibration Monitoring for Fault Detection Andprocess Control


Recent years have seen the rise of vibration problems associated with structures, which are more delicate and intricate, machines, which are faster and more complex, and production processes, which are automated and interlinked. The occurred problems are direct related with demands of lower investment, running and maintenance costs in coincidence with the requirements of increased productivity and efficiency. Consequently, there has been the necessity for a better understanding of vibration causes and the dynamic response of complex machinery as well as single components. Shown are basics of comprehensive vibration analysis based on an aimed instrumentation of the unit to be supervised and the state of art in monitoring using statistical time values for general signal description and threshold comparison, envelope analysis and spectrum, phase and correlation analysis of multi sensor arrangements. Hints are also given to data reduction using cepstral and hocerence analysis in combination with the extraction of machine or fault specific characteristical patterns as input values of vector or neural classification.

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