| Citation: | ZHANG Yuxi, YANG Yang, ZENG Jin, et al. Prediction of response intervals for misalignment faults in uncertain rotor systems[J]. Journal of Aerospace Power, 2025, 40（2）：20220540 doi: 10.13224/j.cnki.jasp.20220540
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Considering the effect of interval uncertainty on aero-engine rotor systems, a non-embedded interval analysis method based on Chebyshev orthogonal polynomials was applied to analyze the dynamics of rotor systems with parameter uncertainties. The uncertainties of the key parameters, such as the amount of blade disk unevenness, the amount of coupling misalignment, and the mass of coupling sleeve teeth, were taken into account to establish a dynamic model of the rotor system with misalignment faults. On this basis, the vibration response of the uncertain system and the influence of its parameters were investigated by numerical simulation, and the sensitivity of the vibration response of the rotor system to different uncertain parameters at different rotational speeds was analyzed. Meanwhile, the effectiveness of the method was verified by comparing with the traditional Monte Carlo simulation. The results showed that the vibration response of the rotor system presented an interval form under the influence of the uncertainty interval parameters, and the effects of different uncertainty parameters showed obvious differences. Under the combined effect of multiple sources of uncertainty parameters, the interval phenomenon of the system was more obvious, and even the critical speed of the system was also affected. The results of this study can provide a theoretical reference for prediction of the uncertainty response of complex rotor systems with misaligned faults.
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