Characterization and Experimental Validation of the Dynamic Behavior of the Structure Support of an Industrial Turbo-Alternator


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Abstract


The complexity of the revolving machines met in industry and in particular the turbo shaft engines, do that dynamic behavior of these machines in their operation environment could be far from the forecasts if the model were not sufficiently predictive or those certain mechanical characteristics or of the environmental conditions changed in the course of exploitation. It is the case suggested in this paper. It is about reinforced a concrete table resting on gantries through viscous elastic supports.
This table supports a revolving machine on which a phenomenon of abnormal vibrations appeared in time. In order to characterize the real dynamic behavior of this machine and its carrying structure, a global solution based on an experimental analysis brought closer with a modelling and a numerical calculation was proposed. For that, vibratory series of measurements on site were carried out, interpreted and compared. For this purpose, a model by readjusted finite elements compared to the experimental results was presented. The interpretation of the results obtained (frequencies and critical modes, modal deformations, dynamic responses…) allowed to decide as for the mechanical resistance of the structure carrying the machine in its current state and to identify the origin of these excessive vibrations.


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Keywords


Stress; Vibrations; Models; Modal Analysis; Eigen Frequencies; Deformed Modal; Critical Modes; Damping; Resonance; Dynamic Response

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