Nonlinear characteristics such as bifurcation and chaos under three kinds of models are compared . and nonlinear characteristics of coupled vibrations under the model supporting with bearings are analyzed detailedly . the acquired torsion properties and nonlinear characteristics of cracked rotor have good assistant effect on diagnosing cracked fault 以重力占优的开闭裂纹模型为研究对象，研究了裂纹转子升速过程的弯扭耦合振动瞬态响应特性及影响因素，探讨了1 3阶及1 2阶亚谐共振特征；在考虑转速涡动情况下，比较了三种模型的分叉与混沌等非线性特性，并详细分析了轴承支承模型的弯扭耦合振动非线性特性。
