Dynamic Characterization Of Hydroelectric Turbine In Transient Using OBMA And Phase-Shift Analysis
Résumé
The purpose of this paper is to investigate the possibility of estimating Francis hydroelectric turbine modal parameters in transient conditions by focusing on resonance regions generated by the interaction of a structural mode with a frequency-variant harmonic pressure pulsation. Especially when numerous modes are in the same bandwidth, this method separates them by exciting only matching mode shapes. To extract a specified harmonic from the signal, the resonance retrieval is done using Order Tracking method. A classical ambient modal identification algorithm is then used to feature the isolated mode. Furthermore, using the phase-shift between measured locations, modes can be localized and shape determined.
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