Comparison of the characteristics of aerostatic journal bearings considering misalignment under pure-static and hybrid condition

In this paper, the steady-state characteristics, including film pressure, load capacity, stiffness, misalignment moment of aerostatic bearings considering two types of misalignment (along vertical direction theta y and along horizontal direction theta x) are studied under pure-static and hybrid condition. The journal misalignment effects on the steady-state characteristics under pure-static condition and hybrid condition are studied comparatively. The results show that the load capacity and stiffness increase with the increase in the degree of journal misalignment under hybrid condition, while they decrease with the increase in the degree of journal misalignment under pure-static condition. Moreover, the journal misalignment along two perpendicular direction effects on the performances of aerostatic bearings are also investigated comparatively and the performances of bearing are found to be more sensitive to the misalignment along horizontal direction.