| Citation: | WU Taihuan, WANG Kun, ZHANG Wanyang, et al. Vibration modulation mechanism and features of an inter-shaft bearing with raceway damage[J]. Journal of Aerospace Power, 2025, 40（8）：20240328 doi: 10.13224/j.cnki.jasp.20240328
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To reveal the vibration modulation mechanism and envelope spectrum features of an inter-shaft bearing with raceway damage, the modeling, simulations and experimental validations of vibration in a dual-rotor system were conducted. Considering the concurrent action of the rotor unbalance centrifugal loading and the rotor dead weight, the amplitude modulation mechanism of the inter-shaft bearing fault vibration was explored. The results indicated that when the rotor unbalance centrifugal loading was much smaller than the rotor system dead weight, the loading zone of the inter-shaft bearing maintained a traditional fixed pattern. The amplitude modulation of vibration caused by the raceway damage was mainly originated from the change in damage position caused by raceway rotation. When the rotor unbalance centrifugal loading was equivalent to or greater than the rotor system dead weight, the loading zone of the inter-shaft bearing was in a moving pattern. In addition to the modulation due to shaft rotation, a more complex modulation relationship could be caused by the ‘chasing’ motion pattern between the moving loading zone and the raceway damage location. The modulation frequencies encompassed the rotation speeds of the high-pressure rotor, low-pressure rotor and their difference. Moreover, under the action of the rotor unbalance centrifugal loading, the complex modulation relationships altered the energy distribution of the envelope spectrum.
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