基于连续模型和离散模型的微尺度三维凸台轴承的气体润滑分析

Gas Lubrication Analysis of Three Dimensional Micro Scale Gas Slider Bearings withBumps Based on Continuum and Discrete Models

为了考察应用图案化盘片实现超高密度磁存储时磁头/磁盘界面气体润滑设计理论的有效性,本文设计了1种三维凸台轴承构型,分别使用直接模拟蒙特卡罗方法(DSMC)和气体分子薄膜润滑理论(MGL)方法进行了模拟计算,考察了相对滑动速度、轴承最小间隙、凸台高度和入射速度方向对气体轴承压力分布的影响.结果表明:对于三维凸台微尺度气体轴承,MGL方法的计算结果依然与DSMC方法的结果相差不大.存在凸台接触,轴承间隙为零的情况下,气体轴承仍然具有一定的承载能力,且压力分布形状随凸台高度的变化表现出与常规非接触式气体轴承不同的规律.

In order to investigate the validity of gas lubrication theory in head/disk interface when ultra-high aeral density was achieved by using patterned media technology,a three dimensional slider bearing model with bumps was devised and simulated using both Direct Simulation Monte Carlo（DSMC） and Molecule Gas-Film lubrication（MGL） Method.The effects of relative sliding velocity,bearing clearance,bump height and angle of incidence on pressure distribution of gas slider bearing were considered.Results indicated that the difference between results of MGL and DSMC method was slight for this three dimensional slider bearing with bumps.In situation of bump contact and bearing clearance approaching zero,gas slider bearings still had certain bearing capability,and the trends of pressure distribution varying with bump height were different from conventional non-contact slider bearings.