硬盘磁头滑块径向飞行特性分析

Analysis of radial flight characteristics of hard disk head slider

在硬盘工作过程中,磁头滑块径向飞行特性对硬盘的工作性能有重要影响。根据硬盘磁头/磁盘界面Reynolds方程和动力学方程,研究了磁盘径向位置变化对磁头滑块飞行特性的影响,同时,分析了滑块最小飞高、俯仰角和侧倾角的变化对滑块动态径向飞行特性的影响。研究得出:磁盘半径位置对滑块静态和动态飞行特性影响明显,且在不同初始最小飞高和俯仰角条件下有所区别。半径越大,承载力越大,初滑块始最小飞高越小、俯仰角越大,承载力变化幅度越大;压力中心X_(c)受初值影响较大,压力中心Y_(c)随半径的增大不断减小。磁头滑块最小飞高、俯仰角和侧倾角随磁盘半径的增大,波动幅度明显增大。滑块动态径向飞行过程中,当寻轨速度不超过2 m/s时,滑块的径向寻轨速度越大,后期飞行越平稳。

In working process of hard disk,radial flight characteristics of its head slider have an important influence on working performance of hard disk.Here,according to Reynolds equation and dynamic equation of hard disk’s head-disk interface,effects of disk radial position on slider flight characteristics were studied.Meanwhile,effects of slider’s minimum flying height,pitch angle and roll angle on slider’s dynamic radial flight characteristics were analyzed.The results showed that disk radius position has obvious influences on slider’s static and dynamic flight characteristics,and they are different under slider’s different initial minimum flight height and pitch angle;the larger the disk radius,the larger the slider load-bearing;the smaller the slider initial minimum height and the larger the pitch angle,the larger the slider load-bearing variation range;the pressure center X_(c) is greatly affected by slider initial minimum height,and the pressure center Y_(c) decreases with increase in disk radius;slider’s minimum flying height,pitch angle and roll angle have obvious increasing fluctuations with increase in disk radius;in slider dynamic radial flight process,when its tracking speed is less than 2 m/s,the larger the slider radial tracking speed,the more stable its later flight.