1　前　　言莱茵河劳芬堡水电站扩建时以 10台Ｓｔｒａｆｌｏ轴流式水轮机代替旧的辐向轴流式水轮机 ,首批水轮机运行后就发现新拦污栅某些构件产生振动。为探究发生振动的原因 ,在拦污栅和电站厂房的不同位置进行了振动测量 ,并利用ＦＥＭ作了大量的动态分析。根据测量和计算 1 Introduction In the expansion of the Rhine-Laubenhoa hydropower station, 10 Straflo axial turbines were used to replace the old radial axial turbines. Some of the components of the new trash rack were found to vibrate after the first turbines were operated. In order to investigate the causes of vibration, vibration measurements were made at different locations of the trash rack and powerhouse, and a great deal of dynamic analysis was done using FEM. According to the measurement and calculation