硬盘驱动器冲击激励的头盘碰撞分析

Analysis of head disk collision for hard disk drives under shock excitations

根据Winchester型硬盘驱动器在冲击载荷作用下头盘碰撞的动力学方程,利用数值模拟方法分析了在正弦半波激励条件下头盘系统的动力学响应过程。当头盘系统发生碰撞时,冲击激励峰值加速度与作用时间的倒数之间具有近似线性关系。随激励强度和作用时间的变化,硬盘驱动器具有性能退化、盘面局部损坏和头盘系统结构破坏三种失效形式。磁头浮动块与磁盘盘面发生多次碰撞,碰撞位置可能在浮动块尾端,也可能在浮动块的前端。硬盘驱动器冲击失效的理论分析结果得到了爆炸冲击环境条件下试验现象的验证。

The dynamical response of head disk system to a half sine pulse excitation is analyzed by means of numerical method according to the dynamical equations of head disk collision under the shock excitation for the Winchester type hard disk drive. When the head disk collision occurs, the peak acceleration of the shock pulse approximately follows a linear relationship with the inverse of the excitation duration. With the change of the excitation intensity and duration, the failure of a hard disk drive can be categorized into three modes, the performance degradation function failure, the local damage of disk surface and the structural damage of head disk system. The head disk collision can take place many times, whose locations may be at the trail of the slider or the front. The theoretical result agrees well with the experimental data.