关键词: 承载能力, 刚度, 静压气体轴颈轴承, 均压槽, 数值仿真

Abstract: That how to improve the load capacity and stiffness of externally pressurized gas journal bearings by opening pressure-equalizing grooves with different structure is studied. The weighted residual method and the finite element method are adopted to solve Reynolds equation for digital calculation and simulation. Aiming at gas journal bearings with single row and double row orifices, some influence factors of pressure-equalizing grooves on the load capacity and stiffness are studied, which include the length of circumferential pressure-equalizing grooves, the number, location and length of axial pressure-equalizing grooves. It is found that the load capacity of bearing can be improved by opening both circumferential and axial pressure-equalizing grooves. Comparing with opening circumferential pressure-equalizing grooves, opening axial pressure-equalizing grooves is more helpful to improve load capacity of bearing, and that the load capacity of bearing can be improved greatly by opening only one or two axial pressure-equalizing grooves. When the axial pressure-equalizing grooves are opened on the location of small gas film clearance, the load capacity and stiffness of bearing can reach maximum. The digital simulation results are verified by experiments. The research results can be used to guide the design of externally pressurized gas journal bearings with high load and high stiffness.

Key words: Digital simulation, Externally pressurized gas journal bearing, Load capacity, Pressurized-equalizing groove, Stiffness