Research on Model Updating of Rotating Blades

A model updating method is proposed for analyzing the vibration characteristics of rotating blades, which combines the superelement method with an improved cross-model cross-mode method. Taking the cantilever beam model with rotation as an example, the overall modeling method and the superelement modeling method are used to model separately, and the finite element model is updated using the improved cross-model cross-mode method. The results show that the frequency difference between the overall modeling method and the superelement modeling method in the modal simulation results is less than 2%, and they have the same vibration mode. The correction error of the overall modeling method is 0.4%, while the correction error of the superelement modeling method is less than 0.1%, and the superelement modeling has better correction efficiency. It provides an effective technical path for analyzing the vibration characteristics of rotating blades.