Dynamic model for high-speed rotors based on their experimental characterization

Abstract

Rotating systems components such as rotors, have dynamic characteristics which are of great importance to understand because they may cause failure of turbomachinery. Therefore, it is required to study a dynamic model to predict some vibration characteristics, in this case, the natural frequencies and mode shapes (both of free vibration) of a turbocompressor shaft by using the finite element analysis (FEA). The peculiarity of the dynamic model is that it is based on input data obtained experimentally, so it is automatically validated by comparing the output data. The natural frequencies and mode shapes of the rotor were obtained with experimental modal analysis by using the impact test. The results predicted by the model are in good agreement with the experimental test. The model is also flexible with other geometries and has a great time and computing performance, which can be evaluated with respect to other commercial software's in the future.Index Terms-finite element analysis (FEA), modal analysis, natural frequency, rotordynamics.