Abstract
A pilot system has been developed which automatically scans and evaluates experimental vibration data obtained from a test rig replica of a bladed wheel of a turbine in service. High vibration amplitude signals are selected for further analysis. This data is converted into digital form using an analogue to digital converter and is processed in a digital computer suitably programmed for harmonic analysis. The results are plotted on a Campbell Diagram using an on-line digital X-Y plotter which gives a visual record of the most salient information from the tests in a readily interpreted form. The paper describes the equipment used, the method of converting the analogue-type signals to digital form, analyses the accuracy of the conversion method, and gives the reasons for undertaking such vibration analysis.
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