Shock analysis of non-operating hard disk drives based on a multibody dynamic formulation
Shock analysis of non-operating hard disk drives based on a multibody dynamic formulation
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基于多体动力学公式的非运行硬盘驱动器冲击分析
DOI：
10.1007/s00542-005-0052-4
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发表时间：
2006
期刊：
影响因子：
--
通讯作者：
H. Harmoko
中科院分区：
文献类型：
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作者：
F. Gao;F. F. Yap;Ying;H. Harmoko
硬盘驱动器（HDD）在硬表面上跌落、撞击或弹跳可能会损坏其内部，而不会有外部损坏迹象。与硬地接触将使滑块离开磁盘表面，然后返回到表面上。受到此类冲击的驱动器可能在初次使用时发生故障，或者驱动器的可靠性可能会随着时间的推移而降低。因此，工业界对导致滑块从磁盘表面抬起的冲击条件非常感兴趣。有限元软件ANSYS/LS-DYNA常用于分析这种冲击问题。然而，这种方法消耗大量的时间。进行设计参数研究也是困难的，因为当某些设计变量改变时，需要重新分析整个HDD系统的模型。提出了一种分析非工作硬盘冲击问题的柔性多体动力学模型。采用拉格朗日方程推导了音圈电机-驱动器组件和磁盘-主轴系统的运动控制方程。通过引入滑块与磁盘表面之间的约束方程，得到了整个HDD系统的冲击响应。数值结果表明，该方法是合理的，可以在较短的时间内确定使滑块提离的加速度幅值。最后，分析了冲击持续时间、滑块静止位置等驱动参数对滑块抗冲击性能的影响。
Dropping, striking, or bouncing a hard disk drive (HDD) against a hard surface can damage it internally without external evidence of damage. Contact with a hard ground will lift the slider off the disk surface and then slap back on the surface. A drive that is subjected to this type of shock may fail on initial use or the reliability of the drive may degrade over time. Therefore, industry has a lot of interest on the shock conditions that cause a slider to lift off the disk surface. Finite element software such as ANSYS/LS-DYNA is often used to analyze this shock problem. However, this method consumes a great amount of time. It is also difficult to perform design parameter studies because it requires re-analysis of the model of the entire HDD system when certain design variables are changed. This paper presents a flexible multi-body dynamics formulation to analyze the shock problem of non-operating HDDs. Governing equations of motion of the voice coil motor (VCM)–actuators assembly and the disks–spindle system are derived using a Lagrangian formulation. By introducing constraint equations between the slider and the disk surface, the shock response of the whole HDD system has been obtained. Numerical results show that the method is reasonable and the acceleration amplitude which makes the slider lift off can be determined in a significantly shorter time than by the conventional approach. Finally, the effect of drive parameters on shock resistance, such as shock duration and slider resting location are analyzed.