面粗さを考慮した動的分子気体潤滑問題のFEMによる摂動解法

概要

論文の詳細を見る
The perturbation solution using FEM for dynamic characteristics of molecularly gas-lubricating films incurring surface roughness effects is derived. Averaged film thicknesses considering surface roughness effects and flow factor ratios which modify pressure flow rates owing to molcular rarefaction effects are both involved in the time-dependent averaged Reynolds equation. Applying the perturbation technique to the Reynolds equation yields a dynamic molecular gas lubrication equation considering surface roughness effects. Then, formulation for FEM to solve the dynamic equation is developed. Finally, the present method is applied to the lubricating films between a flying head and a disk having longitudinal or transverse roughness to obtain landing-off characteristics, and stiffnesses and damping coefficients of the films. From the comparison between slip-flow lubrication and molecular gas lubrication under the same loading condition, it is found that the former underestimates the roughness effects. Comparing under the same flying height condition, however, differences between the two are quite small.
一般社団法人日本機械学会の論文
1995-07-25