针对某型航空高速长轴转子系统振动问题，考虑不同轴承支撑形式和轴承阻尼，建立了高速长轴转子系统计算模型，基于Ansys Workbench研究了轴承支撑形式与轴承阻尼对临界转速的影响规律。系统在轴承为刚性支撑时的临界转速远高于轴承为柔性支撑时的临界转速；系统在轴承同为刚性支撑下，考虑轴承阻尼时，临界转速随着阻尼的增大而减小，特别是在前三阶尤为明显，而随着阶次越高，轴承阻尼对临界转速的影响也逐渐减小。此外，还对高速长轴转子系统进行了谐响应分析，系统在不同位置处的响应情况基本一致；系统响应幅值随着不平衡量增大而增大；在不平衡量作用下，考虑轴承阻尼时，随着阻尼的增大，系统响应幅值均呈现增大的趋势。

For an aerospace high-speed long-shaft rotor system vibration problem, considering different bearing support forms and bearing damping, a high-speed long-shaft rotor system calculation model was established, and the influence law of bearing support forms and bearing damping on the critical speed was studied based on Ansys Workbench. The critical speed of the system with rigid bearing support is much higher than that with flexible bearing support; the critical speed decreases with the increase of damping, especially in the first three orders, and the influence of bearing damping on the critical speed decreases with the higher order. In addition, the harmonic response of the high-speed long-shaft rotor system was analyzed, and the response of the system at different positions was basically the same; the response amplitude of the system increased with the increase of unevenness; under the action of unevenness, the response amplitude of the system showed an increasing trend with the increase of damping when bearing damping was considered.

TH133.2???????

重庆市杰出青年科学基金项目