Dynamics and Simulation of Head-Medium Interface in Magnetic Storage Systems

磁存储系统磁头-介质界面的动力学与仿真

• 批准号: 63460106
• 负责人: OTA Hiroshi
• 金额: $ 4.48万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1988
• 资助国家: 日本
• 起止时间: 1988 至 1989
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-63460106/
• 关键词: Flying Head; Thin Film Hydrodynamic Lubrication; Reynolds Equation; Surface Roughness; Slip Flow; Transient Response; Laser Measuring; Magnetic Storage System; 動特性; 平均すきま; レーザ測長

TO analyze the head crash phenomena, which are the most significant concern in the head-medium interface problem, experimental apparatus for accurately measuring flying head dynamic characteristics was realized, and analytic methods which enable to simulate the flying head dynamics in a ultra thin spacing were established.1. Experimental apparatus: Stable flying operation of a flying head down to 0.03 mum was confirmed using newly designed experimental apparatus, which comprises high stiffness air spindle, air circulating dust filtering system and vibration control table. A high accuracy of down to 1 or 2 nm and a minimum measurement limit of 0.03 mum were achieved utilizing spacing measurement system based on laser interferometry which successfully eliminated undesirable interference fringes in beam spot and resonance noise in laser output.2. Analytic method: The average film thickness theory was tended to gas lubrication possessing surface roughness in the slip flow regime. A simplif … More ied averaged Reynolds equation was derived and its applicability to determining the surface roughness effects in the slip flow regime was confirmed through comparing with experiments. The compressibility effects of lubricating films incurring a roughness on film thickness averaging were studied numerically.Averaged static and dynamic lubrication equations were derived in the general form containing anisotropic film thickness dependent on roughness orientation. Solving these equations leads to a presentation of the dynamic characteristics of lubricating films existing between computer flying heads and textured media. Transient responses of head sliders flying over a bump were demonstrated indicating the effects of roughness orientation and roughness movement. It is interesting to note that longitudinal roughness serves to de crease damping coefficients and inversely affects moving transverse roughness. Thus, slider excursion immediately flying over a bump is minimum for longitudinal roughness and the damping speed of residual vibration is maximum for moving transverse roughness. Less

为了分析磁头碰撞现象，这是磁头-介质界面问题中最重要的问题，实现了精确测量磁头飞行动力学特性的实验装置，并建立了能够模拟超薄间距下磁头飞行动力学的分析方法.实验装置：使用新设计的实验装置，其中包括高刚度空气主轴，空气循环灰尘过滤系统和振动控制台的稳定飞行操作的飞行头下降到0.03妈妈被证实。利用基于激光干涉法的间距测量系统，实现了低至1或2 nm的高精度和0.03 μ m的最小测量极限，成功地消除了光斑中的干涉条纹和激光输出中的共振噪声.分析方法：平均膜厚理论在滑移流区更倾向于具有表面粗糙度的气体润滑。单形 ...更多信息 推导了平均雷诺方程，并与实验结果进行了比较，证实了该方程对滑移流区表面粗糙度效应的适用性。数值研究了具有粗糙度的润滑膜的可压缩性对膜厚平均化的影响，导出了包含各向异性膜厚依赖于粗糙度方向的一般形式的平均静态和动态润滑方程。求解这些方程导致计算机飞头和纹理介质之间存在的润滑膜的动态特性的介绍。磁头滑块飞越凸块的瞬态响应表明粗糙度的方向和粗糙度的运动的影响。值得注意的是，纵向粗糙度的作用是降低阻尼系数，而横向粗糙度的作用则相反。因此，滑块漂移立即飞越凸块是最小的纵向粗糙度和残余振动的阻尼速度是最大的移动横向粗糙度。少

项目成果

Y. Mitsuya and T. Hayashi: "Transient Response of Head Slider When Flying Over Textured Magnetic Disk Media" Proceeding of International Tribology Conference, 1990-10.

Y. Mitsuya 和 T. Hayashi：“飞过纹理磁盘介质时磁头滑块的瞬态响应”国际摩擦学会议论文集，1990-10。

Y.Mitsuya.T.Ohkubo,and H.Ota.: ""Averaged Reynolds Equation Extended to Gas Lubrication Possesing Surface Roughness in the Slip Flow Regime: Approximate Method and Confrmation Experiments"," ASME Journal of Tribology. 111. 495-503 (1989)

Y.Mitsuya.T.Ohkubo 和 H.Ota.：“平均雷诺方程扩展到滑流流态中具有表面粗糙度的气体润滑：近似方法和确认实验”，ASME 摩擦学杂志。

三矢,太田: ""媒体面の面粗さを考慮した浮動ヘッドの動特性解析"" 日本機械学会論文集(投稿予定.).

Mitsuya, Ota：“考虑介质表面表面粗糙度的浮头动态特性分析”，日本机械工程学会论文集（待提交）。

Y.Mitsuya and T.Hayashi: "“Numerical Study of Film Thickness Averaging in Compressible Lubricating Films Incurring Stationary Surface Roughness"," ASME Jounal of Tribology,. 112. (1990)

Y. Mitsuya 和 T. Hayashi：“引起固定表面粗糙度的可压缩润滑膜中膜厚度平均的数值研究”，ASME 摩擦学杂志 112。（1990 年）

Y. Mitsuya and T. Hayashi: "Numerical Study of Film Thickness Averaging in Compressible Lubricating Films Incurring Stationary Surface Roughness" ASME Journal of Tribology, 112, 3, 1990-7.

Y. Mitsuya 和 T. Hayashi：“引起固定表面粗糙度的可压缩润滑膜中膜厚平均的数值研究”ASME 摩擦学杂志，112, 3, 1990-7。