针对大型汽轮发电机组发电机定子壳体振动超标和非稳态振动问题，提出了一种基于发电机壳体结构共振的故障识别及综合治理方法，并以某300 MW和某630 MW机组为例进行了验证。结果表明：发电机定子底部载荷分布不均诱发的连接刚度下降和发电机转子的热不平衡是导致发电机定子局部共振或振动超标的主要原因，采取载荷均布调整、现场动平衡等措施，可消除此类故障。

In order to manage the excessive stator housing vibration and nonsteady vibration problems in large turbogenerators,a diagnosis and treatment method based on housing resonance is proposed.Two different generator sets,which capacities are 300 MW and 630 MW respectively,are taken as the examples to validate the proposed method.The result shows that the decrease of the connection stiffness induced by the uneven load distribution at the bottom of the stator and the thermal imbalance of the rotor are the main causes of local resonance and excessive vibrations.Proper measures including load uniformity adjustment and onsite dynamic balance are found to be effective to eliminate such failures.

TM31，TH17

国家自然科学基金(51777074)；河北省自然科学基金(E2020502032)；中央高校科研业务专项基金(2020MS114,2018YQ03)；河北省第三批青年拔尖人才支持计划(\[2018\]-27)