In response to the vibration fatigue fracture of the steam turbine blade, we construct the 3D model of cracked blade based on the actual crack location, then modal analysis is conducted to the blade with crack and one without crack using the finite element software ANSYS. Thus, we can get the respective natural frequencies and the figure of main vibration modes. The compression results show that the existence of the crack can make the natural frequencies of blades drop and the blades have the greatest sway and twisting deformation along the Y axis. These characteristics above can effectively identify the presence of blade cracked. It has crucial meaning for achieving cracked blade online monitoring.
展开▼
