MODAL ANALYSIS USAGE IN DIAGNOSTICS OF WELDED CYCLICALLY SYMMETRIC STRUCTURES
The paper presents the results of computer simulation of free oscillations of welded structures with defects. The results of the conducted numerical experiments show that weld defects can make a significant mistuning in the spectrum of natural oscillations of welded impellers industrial fans relating to cyclically symmetric structures. The article establishes that the detuning leads to a substantial localization of vibrations in the lower forms on the blade with a defect, which can serve as a diagnostic feature when performing fault detection of such structures.