Based on Reynolds equation with Reynolds boundary conditions, Castelli method was employed to solve Reynolds equation for oil lubrication in bearings.By doing so, a profile of nonlinear oil film force of single pad journal bearing was established.According to the structure of a combined journal bearing, its nonlinear oil film force was obtained using retrieval, interpolation, and assembly techniques.For a symmetrical flexible Jeffcott rotor system supported by combined journal bearings, the nonlinear motions of the rotor center were calculated using self-adaptive Runge-Kutta method and Poincar mapping with different rotational speeds and different pivot ratios.Numerical results showed that the system performance is slightly better when the pivot ratio changes from 0.5 to 0.6, and reveals nonlinear phenomena of periodic, period-doubling, quasi-periodic motion, etc.%针对流体润滑中具有Reynolds边界条件的非定常Reynolds方程,运用Castelli法求解Reynolds方程,生成了单块轴瓦坐标系下的非线性油膜力数据库.根据固定瓦-可倾瓦组合滑动轴承的结构特点,对单瓦库进行检索、插值和拼装,获得了固定瓦-可倾瓦组合径向滑动轴承的非线性油膜力.针对柔性转子-组合滑动轴承系统,运用自适应步长Runge-Kutta法和Poincar6映射计算了不同支点比下的轴颈的非线性运动轨迹.数值结果表明,转子系统表现出周期解,倍周期解和准周期解等非线性现象,支点比为0.6时的系统性能略优于支点比为0.5时的系统性能.
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