Rotor Critical Speed Calculation Based on Finite Element Method of a Mixed Model

Using a mixed model ideas of lumped parameter method and distributed mass method, the affecting factors of gyroscopic moment, supporting stiffness and shear deformation were taken into account, a rotor-bearing system dynamics model was established, use simple geometric features of a one-dimensional beam model, based on the finite element method, a rotor critical speed calculation program was programed by MATLAB software, examples were used to check the program as well, the calculation results showed that the mixed model based on FEM is effective and has a higher precision, it has great reference value for rotor dynamics analysis and design.