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.
Get full access to this article
View all access options for this article.