为提高国电北仑1号机组经济性及安全可靠性，对其进行整体改造。采用传递矩阵法计算了改造后机组的轴系振动特性，计算结果为轴系各阶临界转速均高于0.5倍工作转速，各轴承处响应峰值均小于50 μm，轴系对数衰减率最小为0.13，轴系扭振固有频率对于工频和倍频的避开率均大于±10%，表明轴系振动合格，轴系设计合理。将计算结果与机组投运后的实测振动参数进行对比，验证了计算方法的可靠性。

In order to improve the economy and safety reliability of Beilun unit #1,its overall transformation was carried out.The vibration characteristics of the shafting of the retrofitted unit were calculated by the transfer matrix method.The results showed that the shafting critical rotary speed of all orders were higher than 0.5 times of the working speed,the peak response of each bearing was less than 50 μm,the minimum logarithmic decrement of shafting was 0.13,and the avoidance range of the natural frequencies of shafting torsional vibrations for the line and twice line frequencies were higher than ±10%,which indicated that the shafting design is reasonable with qualified shafting vibration.In addition,the calculation results in this study were compared with the measured vibration parameters,and the reliability of the calculation method proposed in this paper was verified.

TH132.41

2017年度国家重点研发计划（2017YFB0602200)