Abstract
The subject of this paper is a vibration analysis of an exhaust fan in a power plant unit. Excessive vibrations were observed during the exploitation of the fan, preventing it from proper operation. In order to identify the causes of excessive vibrations, FEM calculations of the vibrations of flue gas ducts, shaft assembly, and measurements on the actual object were conducted. Based on the numerical vibration analysis, the occurrence of resonant vibrations of the flue gas duct and the shaft assembly was demonstrated. Calculations carried out with the use of a laser vibrometer confirmed the occurrence of vibrations with frequencies similar to the frequency forced by the movement of the exhaust fan’s rotor. The results of the analysis contributed to the modification of the shaft assembly and to the introduction of additional stiffening to the walls of pressure and suction ducts.
Published Version
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