在采用有限元法计算转子系统的固有频率时,通常把转子系统化为刚性圆盘、轴段、和轴承座等单元,先计算出各单元的运动方程,然后把各单元组合起来形成系统的运动方程。文章把刚性圆盘和弹性轴段视为同一单元处理,其结果计算更为准确、编程更为简单。同时文章也给出了计算转子系统临界频率的一种较好方法。 When using the finite element method to calculate the natural frequency of a rotor system, the rotor is usually systematized into rigid disk, shaft section, and housing units. The equations of motion of each unit are calculated first, and then the units are combined to form a system of Equation of motion The article treats the rigid disc and the elastic shaft as the same unit, and the result is more accurate and the programming is simpler. The article also gives a better method to calculate the critical frequency of the rotor system.