The influence of finite element model on calculation of critical speeds of a dual-rotor system

In this paper,one-dimensional,two-dimensional and three-dimensional finite element models are created by ANSYS on the base of the same dual-rotor system.By using ANSYS Parametric Design Language(APDL),three dual-rotor critical speeds calculation programs are compiled to find out critical speeds and normal modes for three models respectively.Comparing the results of the three models to the results of transfer matrix method,the results of one-dimensional model are in close consistence with that obtained by transfer matrix method,and the results of two-dimensional model are in close consistence with that of three-dimensional model.These results show that building appropriate finite element models is of great significance for the calculation of dynamic characteristics of rotor systems.