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用多跨多轴承转子系统动力响应有限元—传递矩阵法建模，计算了发电机—励磁机转子及轴承密封环系统的瞬态动力响应。对密封环的动力特性及其对转子振动的影响进行了分析和计算。通过现场实测，证实某引进型３００ＭＷ发电机轴承处振动超差的主要原因是三个：１）励磁机轴系临界转速过于靠近工作转速；２）密封环动力响应的影响；３）轴系三支点的结构使得励磁机一阶模态与发电机二阶模态耦合
The transient dynamic response of generator-exciter rotor and bearing seal ring system was modeled by finite element-transfer matrix method of multi-span rotor system with multi-span dynamic response. The dynamic characteristics of the seal ring and its influence on the rotor vibration are analyzed and calculated. According to field measurements, it is proved that the vibrational overshoot of one imported 300MW generator bearing is caused by three factors: 1) the critical speed of the exciter shaft is too close to the working speed; 2) the influence of the dynamic response of the seal ring; 3) The structure of the fulcrum allows the first-order mode of the exciter to be coupled with the second-order mode of the generator