| Citation: | WANG Longkai, WANG Ailun, YIN Yijun, et al. Vibration characteristics of complex aero-engine rotors considering support constraints[J]. Journal of Aerospace Power, 2023, 38（4）：901-912 doi: 10.13224/j.cnki.jasp.20210463
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In view of the complex structural features and support with dynamic design problems for aero-engine rotors, based on finite element (FE), piecewise linear fitting and degree of freedom (DOF) reduction, the dynamic model of complex rotor-support system of the aero-engine was built by using the main and sub-units to reasonably equivalize the complex rotor, and the validity of the modeling was verified through experiments. The supporting stiffness was designed from the aspects of rotor natural characteristics, strain energy distribution, supporting force and vibration response, and the nonlinear vibration reduction efficiency analysis of elastic support parallel squeeze film damper (SFD) was carried out. The results showed that the dynamic model can reflect the dynamic characteristics of complex rotors well. The appropriate range of support stiffness was 1.5×104−2.8×104 N/mm, and the elastic support parallel SFD design had a significant effect on reducing vibration and supporting force, which met the critical speed design, strain energy constraint and deformation requirement. It provides a quantitative reference basis for aero-engine supporting stiffness and SFD parallel design, which has important engineering application value.
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