In advanced aero-engines, a dual-rotor support scheme with an intermediate bearing is often employed to reduce the number of load-bearing frames and decrease the overall weight of the engine. However, the intermediate bearing-support structure system exhibits typical discontinuous characteristics and is influenced by the complex motion states of the dual rotors during operation, resulting in a harsh and variable load environment for the intermediate bearing-support structure system, which can easily lead to structural damage. This study focuses on the intermediate bearing-support structure system, analyzing the impact of changes in rotor motion states on the load environment of the bearing-support structure system, and proposes de-sign requirements for the bearing-support structure aimed at ensuring structural integrity. Research indicates that under dif-ferent rotor motion states, the interactive effects of bearing component motions subject the structural system to complex load excitations such as impact excitation, rotor harmonic excitation, combined frequency excitation of dual-rotor speeds, and rotor-cage speed modulation frequency excitation. These excitations cause the constraint characteristics of the support struc-ture to deviate from the design values until failure occurs. Therefore, it is necessary to consider the influence of different rotor motion states in the structural design and to verify and optimize the mechanical characteristics of the structure based on these considerations.
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