电主轴用可倾瓦轴承稳态平衡位置计算

Calculation of Steady-State Equilibrium Position of Tilting Pad Journal Bearing in Motorized Spindle

提出一种计算电主轴用可倾瓦滑动轴承稳态平衡位置的新搜索方法,解决了油膜力非线性导致的平衡位置难以搜索的问题。在计算过程中,发现瓦背支点位置的微小变化会在很大程度上影响可倾瓦轴承的8个动力系数。用该搜索方法,采用运动极坐标系同时对多个方向进行搜索,计算出稳态平衡位置。计算结果表明,适当增大瓦背与轴承座的半径差会提高可倾瓦轴承的稳定性;新搜索方法可以有效避免搜索中的死循环,且可用于其他形式的滑动轴承。

A novel search method was presented to calculate the steady--state equilibrium position of a tilting pad journal bearing in motorized spindle for solving the problem of difficult search of equilibrium position from the nonlinear hydrodynamic force. It is found that the slight variations in fulcrum position of pads will have a great influence on the 8 hydrodynamic coefficients during the calculation. With the proposed methods, the steady--state equilibrium position can be calculated in multiple directions search in motion polar coordinate system. The calculated results show that the stability is improved by increasing the difference between outside diameter of pad and inner diameter of bearing bracket. Never--ending loop in process of search is avoided effectively by using of the novel search method. The method can also be applied to other forms of hydrodynamic bearings.