双转子航空发动机实验系统的振动特性研究

Study on the vibration characteristics of air engine dual-rotor experimental system

航空发动机具有工作环境恶劣、可靠度要求高的特点。振动是引起发动机失效的一个关键因素。借助ANSYS等软件对其简化结构——双转子实验台进行了模型建立与仿真分析。结果表明:双转子实验台的共振频率随转速的变化情况与振型的阶数有关;对于同一阶振型,内、外转子不同位置的振幅具有明显差别;改变轴承位置会对各阶临界转速分布情况、各阶振型以及加速到工作转速所经历的临界转速的阶数产生影响。

Aircraft engine has the characteristics of bad working environment and high reliability requirements.The vibration is a key factor of engine failure.In this paper,the simplified structure of the dual-rotor test-bed is modeled and simulated with the help of ANSYS.The results show that:first,the change of resonance frequency of the double rotor test-bed with rotation speed is related to the order of vibration mode;second,for the same vibration mode,the amplitudes of different positions of the inner and outer rotors are obviously different;third,the conditions,including the distribution of each critical speed mode shape of each stage and the order of the critical speed experienced by accelerating to the working speed,will be affected by the moving support position.