【摘要】 用PL30 2双通道数据采集器及频谱分析仪测试了高速转子在升、降速过程中对迷宫密封中气流激振效应的亚异步自激振动响应 ,得到了振动响应的三维频谱图。实验结果声明 ,迷宫密封气流激振对高速转子振动响应有影响 ,迷宫密封结构参数对转子稳定性有影响。迷宫密封气流激振引起的转子亚异步自激振动有一个转速门槛值 ,这种振动一旦发生 ,其振幅随转速的升高而增大 ,而振动频率维持不变。迷宫密封气流激振引起的亚异步自激振动和油膜涡动有显著的不同 ,可以用测试转子振动三维频谱图的方法来诊断高速转子的复杂故障更多还原

【Abstract】 In order to reveal the self\|excited vibration of high\|speed rotors with straight through labyrinth seals in the process of up\|speed and down\|speed,three dimensional spectral plots of vibration of high\|speed rotor stimulated by airflow in labyrinth seals were measured by PL302 (double channels data collector and spectrum analyzer). Qualitative analysis of rotor\|dynamic characteristics was carried out. The results prove that there is a rotor speed threshold in the sub\|synchronism self\|excited oscillation. Once this oscillation occurs, its swing increases with the rising speed of rotors, while its frequency keeps a certain value which is about 77% of the first inherence frequency in this experiment. This kind of oscillation obviously differs from the oil whip induced by the oil\|film bearing, so the complicated fault could be diagnosed by measuring the three dimensional spectral plots of rotor vibration.更多还原