It was observed that the fundamental values of each three types of natural frequencies are relatively high and out of the range of Quill shaft operating speed. The three types of natural frequencies have been found and reported. Each mode has been isolated separately by applying a special type of boundary conditions (restraints) available in program. The first five values of critical frequencies and mode shapes of axial, bending, and torsional vibrations were studied and analyzed. This analysis is essentially needed to study the effect of transient loads applied to Quill shaft of turbo-generator unit under severe loading conditions such as electric network disturbances. The high flexibility of this shaft makes it capable of absorbing high displacements of resonance phenomena. The main function of Quill shaft is to protect the turbo-generator unit against overloads due to electrical network faults. The main goal of this work is to carry out a numerical modal analysis of a Quill shaft of turbo-generator unitaffiliate to Mosul gas turbine station, using a trail version of popular finite element analysis software SolidWorks.
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