Abstract
The inherent vibration characteristics of the structure of a machine is modal and each modal only corresponds to one natural frequency, all kinds of rotor in various engineering need to avoid resonance through its natural frequency. The finite element method is a numerical approximation algorithm, which is used to modal analysis of rotor and divides the complex large continuum into many simpler small units instead of traditional transfer matrix method. The 3D model was built by Solid works and imported into Ansys workbench for the modal analysis and harmonic response analysis of the rotor system with and without base of the pedestal, to determine the natural frequency and principal modal of the system, the theory result was compared with the two cases, It can avoid resonance and ensure the safe operation of the rotor system.
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