研究了非线性弹性转子 -轴承系统的轴心轨迹 ,认为对称不平衡转子是连续弹性轴 ,它两端支撑在滑动轴承上 ,油膜反力采用非线性短轴承模型。推导出了系统的非线性运动方程 ,所求方程的近似周期解即为轴心轨迹。给出在某些参数下轴迹的数值计算结果 The axial trajectory of the nonlinear elastic rotor-bearing system is studied. The symmetrical unbalanced rotor is considered as a continuous elastic shaft. Both ends of the symmetrical unbalanced rotor are supported on the sliding bearing, and the reaction force of the oil film adopts the nonlinear short bearing model. The nonlinear equation of motion of the system is deduced, and the approximate periodic solution of the equation is obtained as the axis locus. The numerical results of the axes under some parameters are given