倾斜状态下静压油垫承载性能研究

静压转台具有摩擦系数小、承载能力强、使用寿命长等优点。但其在使用过程中受载及变形情况复杂,而转台倾斜或自身变形时油膜厚度的不均分布与油垫承载能力之间的规律依然不明晰。该文根据微元法建立一种引入转台倾角的雷诺方程,用倾角描述转台导轨面与支承油垫封油边的不平行程度,从而计算出油垫各处的油膜厚度,然后基于有限差分法求解出不同倾角时定量式支承油垫的油膜压力分布状态以及油垫的油腔压力和承载能力,并得到油腔工作参数及性能随倾角的变化规律,为静压转台支承分析和油膜失效判定提供基础。

RESEARCH ON THE BEARING PERFORMANCE OF HYDROSTATIC OIL PAD UNDER TILTING CONDITION

Hydrostatic turntable has many advantages, such as low coefficient of friction, high load capacity and long life. However, due to the complexity of load and deformation, the principle is still not clearly known between uneven distribution of film thickness and oil pad carrying capacity. Based on the infinitesimal method, a modified Reynolds equation which considers the tilting angle of turntable is derived. According to this formula, the interrelation of turntable guide surface and the sealing edge is described by an inclination angle. The equation is used to analyze the bearing performance of oil pad when the turntable is tilted. Applying the finite difference method to solve the modified Reynolds equation, the pressure distribution of oil film is obtained. Finally, the working parameters of the oil pad and the changing rule of bearing performance with the tilting angle are established. The research result presented in this paper provides theoretical basis for the bearing capacity analysis and the oil film failure determination.