| Citation: | FU Jie, LI Chao, WU Changyao, et al. Damage assessment and dynamic characteristics analysis of rotor systems with multi-stage curvic couplings connection[J]. Journal of Aerospace Power, 2025, 40（X）：20250244 doi: 10.13224/j.cnki.jasp.20250244
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Taking the typical multi-stage curvic couplings of a gas generator rotor as the research object, the dynamic characteristics of the rotor system were analyzed, and the strain energy distribution of the rotor and curvic couplings at critical speeds was examined. An interface damage assessment methodology was developed to evaluate the contact damage of the rotor structure system under different operational conditions, including the assembly state, start-up state, and working state. The evaluation incorporated parameters such as the interface contact state coefficient, interface contact stress, and friction work. Finally, the dynamic characteristics of the rotor considering interface damage were analyzed. The results indicated that the interface damage of curvic couplings D was relatively severe. During the start-up state, the effective contact area ratio of curvic couplings D was approximately 20%. Under working conditions subjected to multiple loads (assembly load, centrifugal load, and thermal load), the effective contact area ratio of curvic couplings D increased to 34.67%, representing an improvement compared with the start-up state. However, the friction work of curvic couplings D rose significantly by 231.6%, and the relative radial deformation between curvic couplings D and its adjacent teeth reached 0.23—0.25 mm, resulting in substantial interface sliding. This phenomenon had a considerable impact on the robustness of the rotor system. Furthermore, considering the effects of interface contact damage, the first and second critical speeds of the rotor changed by 3.11% and 0.55%, respectively, while the bending critical speed decreased by 7.77%.
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