通过对某水轮机噪声、振动测试分析、转轮叶片试验模态分析和采用流 固耦合技术分析转轮叶片在水介质下的动力特性 ,找出水轮机异常振动、异常噪声和叶片裂纹原因———转轮叶片固有频率与转轮叶片卡门涡激励频率相近引发转轮叶片共振 ,采用提高卡门涡频率、降低卡门涡激励能量的处理措施 ,取得了良好效果 Through the analysis of the noise and vibration of a turbine, the modal analysis of rotor blades and the analysis of the dynamic characteristics of rotor blades under water medium using fluid-solid coupling technology, the causes of abnormal vibration, abnormal noise and blade cracks in the turbine are found out. The natural frequency of rotor blade and the vortex excitation frequency of the rotor blade Karman vortex induce the resonance of the rotor blades. The measures to increase the Karman vortex frequency and reduce the Karman vortex excitation energy are achieved, and good results are obtained