基于局部柔度理论和铰链裂纹模型 ,建立了裂纹转子的动力学模型 ,得到了裂纹转子与无裂纹转子的数值仿真解 .利用连续小波时频分析方法 ,讨论了裂纹转子与无裂纹转子的小波时频特性 ,提出了利用小波时频分析方法识别裂纹的新方法 ;数值仿真研究了采样频率对小波时频分析方法的准确性和有效性的影响 ,并给出了建议性的采样频率 .最后实验验证了该方法的有效性和实用性 Based on the local compliance theory and the hinge crack model, the dynamic model of the cracked rotor is established, and the numerical simulation of the cracked rotor and the cracked rotor is obtained. By using the continuous wavelet time-frequency analysis method, the wavelet of cracked rotor and crackless rotor Time-frequency characteristics, a new method of identifying the crack by wavelet time-frequency analysis is proposed. The numerical simulation studies the influence of sampling frequency on the accuracy and validity of the wavelet time-frequency analysis method, and gives the recommended sampling frequency. Experiments show that the method is effective and practical