| Citation: | JIN Miao, WANG Ailun, WANG Qingshan, et al. Dynamic characteristics analysis of the complex rotor-blade system for the aero-turboshaft engine[J]. Journal of Aerospace Power, 2024, 39（10）：20220739 doi: 10.13224/j.cnki.jasp.20220739
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The equivalent contact model of the end-tooth connection including three stages such as the elastic, elastoplastic and plastic deformation was proposed using the Hertz contact theory in conjunction with the mathematical statistics method. In view of the complex structure of the aero-turboshaft engine, the general dynamic model of the complex rotor blade system, including the end tooth connection considering the contact effect, was established based on the finite element method and Hamilton's variance principle. The concrete finite element results demonstrated the validity and correctness of the analytical model. And on the basis, the effects of the pre-tightening forces on the natural frequencies, transient and steady unbalance responses were further investigated. The results showed that the effects of the pre-tightening forces had a significant effect on the contact state of the end-tooth connection. In the relaxation state of the pre-tightening force, the slippage of contact interface can reduce the bending and torsional stiffness of the end-tooth connection, leading to a decrease in the connection stiffness of the end-tooth connection. For the transient and steady-state unbalanced responses, there existed obvious amplitude amplification phenomena in the rotor vibration in
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