ANSYS-based Model Analysis on Torsional Vibration ofDraught Fan Shaft

摘要

Draught fan is the main auxiliary equipment in the thermal power plant. With thernincreasing of the capacity and dimensions of the auxiliary equipment, the torsional vibration of thernshafts becomes serious.This paper founds a mathematical model about the shafts,and a finite elementrnmodel is built by applying the finite element analysis software ANSYS. By changing the wheelrndimensions of the model, such as the wheel diameter, the paper calculated the natural frequencies andrnthe vibration mode of the torsional vibration of the shafts. Results showed that the natural frequencyrnwill decrease as the wheel diameter becomes large, and the change of vibration mode is not sornobvious. This model is simple and the calculation results are reliable. The method is helpful forrnengineering application of the design of the rotor.