The dynamic response of a rod fastening rotor with a transverse crack is investigated. The dynamic equations of the system are derived by using D’Alembert principle. Numerical integration method is used to solve the equations and the amplitude-frequency curve of the system is obtained. The effects of system parameters such as the stiffness reduction, mass centroid eccentricity, damping coefficient of the contact surface and the crack angle on the amplitude-frequency curve are discussed. Compared with integral rotor, besides the 1/2 and 1/3 order sub-harmonic resonances, super-harmonic resonance is discoved in the cracked rod fastening rotor system. System parameters have a great influence on the system amplitude-frequency curve. These results can provide the guidance for the fault diagnose of cracked rod fastening rotors. Meanwhile, the study may have some significance for further understanding of the nonlinear dynamic characteristics of cracked rod fastening rotors.%以拉杆转子为对象，对具有横向裂纹的拉杆转子非线性动力学响应特性进行研究。基于达朗贝尔原理建立考虑轮盘之间非线性接触特性的裂纹拉杆转子系统运动方程。采用数值积分方法对运动方程进行求解，得到轮盘振幅随转速变化的曲线。分析裂纹刚度减小量、轮盘质量偏心矢量夹角、接触面阻尼系数、裂纹角等系统参数对轮盘幅频特性的影响。同整体转子相比，裂纹拉杆转子除在1/2阶、1/3阶临界转速附近发生1/2阶、1/3阶亚谐共振外，在超临界转速区域存在超谐共振。系统参数对裂纹拉杆转子幅频特性曲线影响较大。分析结果可为认识裂纹转子系统的响应特性、开展裂纹转子的故障诊断提供理论指导。
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