介绍了蒙达发电公司的 3号汽轮机组的振动情况 ,通过测试和试验 ,对振动原因作出了具体分析 ,认为由于中压转子热不平衡导致振动。从启动方式上进行了改进 ,提出了降低启动时的蒸汽参数 ,在 2 0 0 0转 /分时增加一个暖机的时间段的改进方案 ,成功的解决了振动问题。依据这一结论 ,在国华准格尔电厂 2号机发生类似的振动后 ,也成功的解决了该机的振动问题 ,而没有去进行大的修理和检查 The vibration of No.3 steam turbine unit in Mengda Power Generation Company was introduced. Through the test and test, the vibration reason was analyzed in detail. It was considered that the vibration was caused by the thermal unbalance of the medium pressure rotor. The improvement was made from the start-up mode. The improved scheme of reducing the steam parameter during start-up and adding a warm-up period at 2000 rpm was put forward and the vibration problem was successfully solved. Based on this conclusion, after a similar vibration occurred at PM 2 of Guohua Zhungeer Power Plant, the vibration of the aircraft was successfully solved without major repairs and inspections