计算机磁头/磁盘超薄气膜润滑压强的算子分裂算法

Operator-Splitting Method to Calculate Pressure of Ultra-Thin Gas Film of Magnetic Head/Disk

以任意拉森数的超薄气体润滑方程为基础,采用算子分裂法和非结构三角网格的有限元法计算Ω型磁头的空气轴承气垫面(ABS)气膜压强分布、气浮力和纵倾力矩;在分析比较流量系数的各种算法的基础上,确定采用多项式拟合数据库计算流量系数.计算结果表明:采用算子分裂法可以有效克服在高轴承数时的数值不稳定性,消除数值振荡;在小轴承数时,气浮力随轴承数增加而增大,当轴承数增大到某一数值后,气浮力趋近某一稳定值,此时气膜压强分布与磁头造型基本一致;气膜的纵倾力矩在轴承数的某一临界值附近出现最大值.

Operatorsplitting and finite element method with unstructured triangular grids were used to calculate the gas pressure distribution of the air bearing slider of a Ωtype magnetic head/disk, based on the gas lubrication equation with arbitrary Knudsen number. The gas lift and pitch moment were also calculated in the same manner. The polynomial fitted database was applied to calculate the flow rate coefficients, based on the comparison of the flow rate coefficients calculated with various algorithms. The numerical results indicated that at a high bearing number, the numerical stability was effectively increased and the spurious oscillations eliminated making use of the operatorsplitting/finite element method. At a small bearing number, the gas lift rapidly increased with increasing bearing number and approached a stable value at a certain bearing number, while the gas pressure profile in this case was consistent with the slider geometry and the gas pitch moment reached a maximum around the critical bearing number.