Modal analysis and pulse response of mobile hard disk head actuator arm assembly

摘要

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 ac-tuator 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 ann assembly is stud-ied.