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研究高速转子在非线性弹性支承－挤压油膜阻尼器中的轴心轨迹计算问题。文中首先根据转子系统无量纲形式的运动微分方程构造一控制目标函数，然后综合最速下降法和牛顿选代法各自的优点，提出一种新的计算非线性转子系统轴心轨迹的优化方案，并用此优化方案计算了一转子系统在给定参数下的轴心轨迹．所得轴颈中心椭圆进动轨道与用Ｒｕｎｇｅ－Ｋｕｔｔａ数值积分法及轨道参数法的计算结果进行了比较，三者结论相当吻合，但本文的优化计算方案大大节省计算机时．文中还描绘出不同阻尼器设计参数时的转子系统轴心轨迹曲线，为合理选用挤压油膜阻尼器系统参数提供了参考．
The problem of calculating the orbit of high-speed rotor in nonlinear elastic bearing-squeeze film damper is studied. In this paper, a control objective function is constructed based on the differential equation of dimensionless motion of the rotor system. Then, based on the merits of the steepest descent method and the Newton method, a new optimization scheme for calculating the orbit of the nonlinear rotor system is proposed. This optimization scheme calculates the orbital path of a rotor system for a given parameter. The results show that the obtained results are compared with the calculated result of Runge-Kutta numerical integration method and orbital parameter method. The conclusions of the three are in good agreement with each other, but the optimized calculation scheme in this paper can save a lot of computer time. The paper also describes the trajectory of the rotor system when different design parameters of the damper are used, which provides a reference for the reasonable selection of the parameters of the squeeze film damper system.