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当硬盘工作时,磁头滑块飞行在高速旋转的磁盘上方,头/盘界面产生了一层只有几个纳米的气膜,该气膜润滑方程为考虑气体稀薄效应的修正Reynolds方程。为了提高磁记录密度,人们正在考虑用离散磁道(Discrete Track Recording,DTR)磁盘取代传统的光滑磁盘。由于这种DTR磁盘表面磁道和沟槽的影响,在数值求解修正Reynolds方程的过程中,就需要足够多的离散网格来分辨出DTR磁盘表面几何形状,从而带来了计算效率问题。基于均匀化理论和修正Reynolds方程的线性流率(Linearized Flow Rate,LFR)模型,该文推导了一个适合分析DTR磁盘气体润滑特性的均匀化Reynolds方程,并采用有限体积法对均匀化Reynolds方程进行了求解和验证。其结果显示:相对于修正Reynolds方程,求解均匀化Reynolds方程只需要很少的离散网格,从而节省了大量的计算时间,大幅提高了计算效率,且两者压力分布、压力中心和承载力的最大相对误差都小于3.5%。
When the hard disk is in operation, the head slider flies above the high-speed rotating disk and the head / disk interface produces a film of only a few nanometers. This film lubrication equation is a modified Reynolds equation that takes into account the gas lean effect. In order to increase the magnetic recording density, people are considering the use of discrete track recording (Discrete Track Recording, DTR) disk to replace the traditional smooth disk. Due to the effects of the tracks and grooves on the surface of the DTR disk, computational efficiency has been a problem in numerically solving the Reynolds equation by requiring a sufficient number of discrete grids to resolve the DTR disk surface geometry. Based on the homogenization theory and linearized flow rate (LFR) model with modified Reynolds equation, a uniform Reynolds equation suitable for analyzing the gas lubrication characteristics of DTR disks is deduced. The uniform volume Reynolds equation Solved and verified. The results show that compared with the modified Reynolds equation, only a small number of discrete grids are needed to solve the homogenized Reynolds equation, which saves a lot of computational time and greatly improves the computational efficiency. The pressure distribution, pressure center and bearing capacity The maximum relative error is less than 3.5%.