| Citation: | ZHANG Jian, ZHANG Dayi, WANG Yongfeng, et al. Coupling vibration characteristics analysis of shared support-rotors system[J]. Journal of Beijing University of Aeronautics and Astronautics, 2019, 45(9): 1902-1910. doi: 10.13700/j.bh.1001-5965.2019.0002(in Chinese)
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The rotor system with turbine mid frame is researched as an objected, and the dynamic model with coupling vibration in transverse and angular degree was employed to reveal the vibration coupling mechanism and influence in shared support-rotors system. It is pointed that support response of one rotor can influence the bearing dynamic stiffness and rotor dynamic characteristic of another, and the calculation error of traditional rotor dynamic modeling exceed 10%, so the vibration coupling should be considered when analyzing critical speed and dynamic response in the rotor system with mid frame. The finite element calculation results for the shared support-rotors system in turbo-shaft engine exhibit that the coupling modes will arise, and the speed of one rotor can affect the critical resonant speed excited by another. The vibration isolation characteristics of mid turbine can also be affected due to the coupling vibration, and compared with non-coupling system, the dynamic response and load-transferring coefficient both remarkably increase.
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