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计算分析了３００ＭＷ汽轮机低压缸末级长叶片Ａ_０振型弯曲振动与轴系扭振耦合对叶片安全性的影响。末级长叶片与轴系扭振耦合将使该叶片振动的实际频率避开率低于计算值，当发生严重的两相短路故障时在叶片根部的最大动弯矩远远高出其额定值；如果电网频率偏离５０Ｈｚ，会对叶片安全性产生更为不利的影响。
The influence of the bending vibration of A0 moderator and the torsional vibration coupling of the shaft on the safety of the blade is calculated and analyzed. The final frequency of the long vane and shaft coupling coupling vibration will make the actual vibration frequency of the blade to avoid the rate of less than the calculated value in the event of a serious two-phase short-circuit fault in the blade root maximum dynamic bending moment is far higher than its rated value ; If the grid frequency deviates from 50Hz, it will have a more adverse effect on blade safety.