对刚性Jeffcott转子进行了分叉行为研究 .无量纲轴承油膜力的表达式中考虑了滑油粘性力的作用 .利用多变量Floquet定理分析了转子的稳定性 .给出了分叉图、Poincar啨截面图和Ｆｌｏｑｕｅｔ乘子变化图 .结果表明 ,转子运动呈现倍周期分叉、切分叉和二次Hopf分叉等复杂的非线性动力学现象 . The bifurcation behavior of a rigid Jeffcott rotor was studied. The oil viscosity force was taken into account in the expression of dimensionless bearing oil film force. The rotor stability was analyzed by the multivariable Floquet theorem. The bifurcation diagrams, Poincaré Section and Floquet multiplier.Results show that the rotor motion shows complex nonlinear dynamics such as doubling period bifurcation, bifurcation and quadratic Hopf bifurcation.