| Citation: | Wu Jinnan, Zhang Haibiao, Liu Fuhua, et al. Dynamic analysis of combined support rotor under thermal load[J]. Journal of Aerospace Power, 2026, 41（X）：20250560 doi: 10.13224/j.cnki.jasp.20250560
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The impact of thermal loads on the dynamic characteristics of a combined-support rotor system in aero-engines was investigated. A temperature-dependent model was developed for the combined-support system, deriving the formulas for the stiffness and damping of elastic rings and squirrel cage elastic supports under varying temperatures. A 3D finite element model of the power turbine rotor was developed, incorporating thermal deformation and stress analysis based on temperature field distribution. A bidirectional coupled model integrating the combined support and rotor was proposed, enabling further analysis of thermal-induced changes in rotor dynamics. Results indicated that thermal loads caused a minor reduction in critical speeds, while vibration amplitudes exhibited significant variations only near critical speed regions. Experimental validation on a rotor test rig confirmed the theoretical analysis.
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