Applied Mathematics and Mechanics >
Dynamic modeling of a fully flexible rotor-stator system with bolt joint and rubbing-induced nonlinear vibration
Received date: 2025-06-14
Revised date: 2025-08-09
Online published: 2025-09-30
Supported by
Project supported by the Fundamental Research Funds for the Central Universities (No. N25BSS052), the National Science and Technology Major Project (No. J2022-IV-0005-0022), the Aero Science Foundation of China (No. 20230015050001), the Shenyang Science and Technology Plan Project of China (No. 24-202-6-01), and the Independent Research Project of the National Key Laboratory of Strength and Structural Integrity (No. BYST-QZSYS-24-072-8)
Copyright
In addition to blade-to-casing rubbing, drum-to-labyrinth rubbing is another common interaction in aero-engines. In this study, the labyrinth seal is simplified and modeled as an inner ring. First, considering the flexibility of both the drum and inner ring, a novel rubbing force model applicable to drum-inner ring rubbing is proposed, and this model is partially validated with the measured vibration responses. Incorporating both drum-inner ring rubbing faults and bolt joint effects, a dynamic model of the shaft-disk-drum-inner ring-vane-casing system (SDDIRVCS) is established with beam-shell hybrid elements to investigate the nonlinear dynamic responses induced by rubbing at various rotational speeds. The established dynamic model of the SDDIRVCS is validated by the comparison of its modal characteristics with those obtained from the ANSYS simulations. The results indicate that the rotor spectrum is dominated by odd-multiple harmonics, while the stator spectrum exhibits prominent even-multiple harmonics. Moreover, the rubbing location between the drum and the inner ring varies with the dynamic behavior of the rotor system.
Hong GUAN , Hui MA , Tianrui YANG , Yanyan CHEN , Yao ZENG , Qinqin MU , Bangchun WEN . Dynamic modeling of a fully flexible rotor-stator system with bolt joint and rubbing-induced nonlinear vibration[J]. Applied Mathematics and Mechanics, 2025 , 46(10) : 1939 -1954 . DOI: 10.1007/s10483-025-3301-8
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