建立了静压气浮偏心球形转子的单摆模型 ,导出了转子摆动周期和偏心距近似与精确计算的解析公式 ,给出了 2种算法的适用条件。最后 ,应用 2种算法做了算例并对其计算结果作了误差分析。 The pendulum model of the hydrostatic spherical ball rotor with static pressure was established. The analytical formulas of approximation and accurate calculation of the rotor oscillation period and eccentricity were deduced. The applicable conditions of the two algorithms were given. Finally, two kinds of algorithms are used as examples and error analysis of the calculation results is made.