汽轮发电机转子外伸端质量不平衡引起的振动分析

讨论了汽轮发电机转子外伸端质量不平衡产生的振动特点及其诊断方法，结合现场分析处理实例，阐明发电机转子外伸端质量不平衡产生的振动类似于主跨转子三阶不平衡引起的振动特性，但有时发电机转子两轴承处也会产生明显的反相振动分量。对于外伸端质量不平衡的识别，应根据主跨转子的振型分离情况、转子动力学知识及现场经验综合判断。

ANALYSIS OF VIBRATION RESULTING FROM OVERHANG END MASS UNBANLANCE OF TUBO - GENERATORS ROTOR

The vibration features and diagnosis method for vibration resulting from overhang end mass unbanlance of turbogenerator's rotor have been discussed. Combined with trouble analysis and remedial cases in the field, the similarity of character for said type vibration with that for vibration resulting from thirdmode unbanlance of main span rotor has been expounded, but sometimes obvious outphasing vibration component may also occur at two bearings of the generator's rotor. The said overhang end mass unbanlance should be comprehensively judged on the basis of main span rotor vibration mode's separation, rotor's dynamics knowledge, and experience obtained in the field.