机匣-双转子高维系统建模与实验验证

A high-accuracy solid finite element model, which is beneficial for expressing complicated geometrical features, was established by using ANSYS software for analysing a certain casing-dual-rotor test rig. The Craig-Bampton mode synthesis method was applied to the model order reducing processes of the casing and rotors, and the whole assembly model was obtained accordingly. The validity of the reduced model was verified under critical speeds and modes. By means of 3D spectrograms and whirl orbits, the steady-state responses were investigated. Finally, the numerical results were compared with the experimental results. The results indicate the modeling and reduction of the casing-dual-rotor test rig are accurate and effective. The work provides a reference to the dynamic study of actual dual-rotor aero-engines.