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Vibration monitoring of computer hard disk drives

机译：电脑硬盘驱动器的振动监控

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HDD's head-disk contact vibrations were studied. The vibration velocity of actuator arm was measured and analysed after gradually increasing the amount of weight put on the actuator arm. The overall vibration levels increased slowly till the weight was 2 g, but increased drastically when the weight was further increased. Permanent circular scratch marks appeared on the disk at 4g weight. The results showed that the vibration levels increased before total disk crash i.e. before scratch marks appeared on the disk. So vibration monitoring can be used to take preventive action. Vibration velocity spectra showed that the levels at main peaks (50 & 120 Hz) and at high frequencies increased substantially when the head-disk contact takes place. HDD rotation cut off and braking circuit can be designed to operate when unacceptable vibration levels are reached. The device can also send a signal to the voice coil drive circuit to bring the head immediately to parking position in addition to stopping the rotation of the platters.
机译：研究了硬盘驱动器的磁头-磁盘接触振动。在逐渐增加施加在执行器臂上的重量之后，测量并分析执行器臂的振动速度。总体振动水平缓慢增加直到重量为2 g，但是当重量进一步增加时急剧增加。重量为4g的磁盘上出现永久性的圆形划痕。结果表明，在整个磁盘崩溃之前，即在磁盘上出现划痕之前，振动水平增加了。因此，振动监测可用于采取预防措施。振动速度谱显示，当磁头与磁盘发生接触时，主峰（50和120 Hz）以及高频处的水平显着提高。 HDD旋转截止和制动电路可以设计成在达到不可接受的振动水平时运行。该设备还可以向音圈驱动电路发送信号，以使磁头立即到达停放位置，此外还可以停止盘片的旋转。

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