磁头驱动臂组件是硬盘驱动器内重要的机械部件，其冲击载荷下的动态响应是影响硬盘驱动器抗振性能好坏的主要指标。本文以2.5英寸移动硬盘驱动器组件为研究对象，在考虑枢轴轴承刚度影响的基础上，建立了驱动臂组件的三维有限元模型，分析了其各阶振动模态，并讨论了脉冲波形、脉冲幅值、脉冲宽度对磁头驱动臂组件动态响应的影响。

Head actuator arm assembly (HAA) is the most important mechanical component of a mobile hard disk drive (HDD) and its shock dynamic response is a principal index of vibration resistance. In this paper, a finite element (FE) model is firstly developed in ANSYS of 2.5 inch (1 inch=25.4 mm) mobile hard disk. This model includes actuator arm, voice coil motor (VCM) and pivot bearing. The various step modal of HAA is calculated by FE model. Then the actuator arm vibration behavior is simulated with LSDYNA procedure. The influence of pulse waveform, pulse amplitude and pulse width on the shock response of the relative displacement of the head actuator arm assembly is studied.