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在轴承动力学和转子动力学基础上建立了某航空发动机双转子-滚动轴承耦合系统的非线性动力学数学模型,采用Newmark有限元法进行了数值求解,就转子转速、中介轴承的游隙和滚子个数以及支承轴承参数对双转子系统动力特性的影响进行了分析并加以实验验证.研究结果表明:①中介圆柱滚子轴承游隙值对双转子系统动力特性影响很大,其原始游隙值取20μm更利于系统运行的稳定性;②支承轴承内、外沟曲率半径的选取将直接影响着双转子系统动力特性;③高压转子与低压转子耦合节点处位移随高压转子转速的增加而减小,随低压转子转速的增加而增加;④中介耦合轴承节点处位移的理论计算值与实验值较为吻合,最大误差为18.7%.
Based on bearing dynamics and rotor dynamics, a nonlinear dynamic mathematical model of a twin-rotor-rolling bearing system for an aeroengine is established. The Newmark finite element method is used to solve the problem. The rotor speed, clearance and roll of intermediate bearing The number of sub-bearings and bearing parameters on the dynamic characteristics of double-rotor system are analyzed and verified by experiments.The results show that: (1) The clearance of intermediate cylindrical roller bearings has a great influence on the dynamic characteristics of double-rotor system, and its original clearance The value of 20μm is more conducive to the stability of the system operation; ② The selection of the radius of curvature of the inner and outer grooves of support bearings will directly affect the dynamic characteristics of the dual-rotor system; ③ The displacement at the coupling nodes of high- and low-pressure rotors decreases with the increase of high- Small, increase with the increase of low-speed rotor speed. (4) The calculated displacement of the intermediate coupling bearing node is in good agreement with the experimental value, the maximum error is 18.7%.