The influences of configuration state change of double-stage high-pressure turbine assembly on rotor dynamic characteristics were studied.By studying the influence process of the working load on the interface contact state and local angular stiffness-deformation characteristics of the double-stage turbine assembly,the configuration states analysis model of the double-stage turbine assembly was established,and the mechanical mechanism of the configuration state change of the assembly was revealed.An equivalent modeling method of rotor dynamics considering the configuration state of assembly was established,and its influences on the rotor dynamics characteristics were studied.The research showed that the uncoordinated deformation of each component in the assembly caused by the complex working load could cause the change of the interface contact mechanical properties and the angular stiffness characteristics of the assembly.Due to the effect of the rotating inertia moment,there was a"sudden drop"phenomenon in the angular stiffness of the double-turbine assembly,which significantly reduced gyroscopic effect and critical speed of the rotor bending mode.The simulation results showed that the critical rotational speed of the rotor bending mode decreased by about 17％after considering the sudden change in the configuration state of the double-turbine assembly.
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