| Citation: | PAN Jianzhi, WEI Dasheng, HU Weinanet al. Variable structure and dynamics properties of mixing rotor due to thermal expansion[J]. Journal of Beijing University of Aeronautics and Astronautics, 2020, 46(1): 67-76. doi: 10.13700/j.bh.1001-5965.2019.0150(in Chinese)
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According to complex and changeable high-temperature environments of large rotating machinery, such as aero engines or steam turbines, the main rotor system of the unit has a variable structure due to thermal expansion under operating conditions, which could also affect the operation characteristics. First, considering high stiffness of turntable-drum mixing, compared with the rotating shaft, the structure is simplified and a single-thickness disk rotor dynamic model is established. Second, aimed at the variable structure characteristics of the system caused by thermal expansion, Hermite interpolation method and curve fitting method are used to depict the bending condition of rotating shaft when the thickness table is at any position, and then bending restoring force provided to disk and the bending restoration stiffness of the shaft are calculated by using numerical methods, basing on elastic potential energy stored in the bending.Finally, through numerical analysis of precession frequency, critical angular velocity and response amplitude of thick disk rotor system, it is verified that axial movement induced by thermal expansion is one of the main factors that affect the dynamics properties of thick disk rotor system.
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