滑动轴承动力特性的数值计算方法

将计算流体动力学与简谐激励法应用于滑动轴承动力特性系数的求解,通过采用全新的变流域动网格技术提出一种基于瞬态流场计算的滑动轴承动特性的计算方法。利用所提出的方法计算典型滑动轴承的刚度、阻尼系数,并与已有的经典计算结果进行比较。结果表明:两种方法的计算结果基本吻合,提出的新方法不仅考虑了计算初值的影响,而且计入了实际存在的油膜破裂现象,满足精度要求,有效可行。

Numerical calculation method of dynamic characteristics of journal bearing

The computational fluid dynamics (CFD) and harmonic excitation method were applied to the numerical calculation of dynamic characteristics of journal bearing. By employing a new mesh movement approach based on structured grid, a new approach for calculating the dynamic characteristics of journal bearing was proposed based on the transient flow calculation. The stiffness and damping coefficients of a typical bearing were calculated by applying the new approach. The results obtained from the method were compared with previous classic computation results. The results show that the computation results of two methods are consistent. The effects of the computational initial value and the oil film fracture phenomenon are considered in this method, which is suitable for most of the journal bearing structures. The numerical method has good accuracy, and the method is valid.