Unbalance Vibration Characteristics and Sensitivity Analysis of the Dual-Rotor System in Aeroengines

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Unbalance Vibration Characteristics and Sensitivity Analysis of the Dual-Rotor System in Aeroengines

Ma, Pingping / Zhai, Jingyu / Wang, Zihuimin / Zhang, Hao / Han, Qingkai

The unbalance of the rotor system is the main factor causing the vibration of aeroengines. Research on unbalancing vibration coupling, vibration transmission, and vibration sensitivity of inner and outer dual rotors is the key link of the whole machine vibration and dynamic balance research. In this paper, the motion differential equation and dynamic model of the inner-outer dual-rotor system are established, and the unbalanced vibration of the dual-rotor system considering the coupling effect of the intermediate bearing is studied by combining theoretical analysis and simulation methods. The influence of unbalanced position, the magnitude and phase of unbalance, and the stiffness of the intermediate bearing on the vibration response of dual rotors are obtained. Aiming at the randomness of the unbalance vector distribution in the rotor system, the unbalance vector is extracted based on the Monte Carlo sampling principle. The multidisk and multiplane unbalanced vibration response law of the dual-rotor system is obtained, and the vibration transmission law and vibration sensitivity of the rotor under an unbalanced state caused by the coupling action of the inner-outer rotors are revealed. Finally, an experiment is carried out based on a self-designed test bed; the measured results are consistent with the analytical and simulation results.