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H_∞ compensation of external vibration impact on servo performance of hard disk drives in mobile applications

机译:H_∞外部振动补偿对移动应用中硬盘驱动器伺服性能的影响

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摘要

H_∞ compensation for external vibration impact on the positioning accuracy of hard disk drives is considered in this paper. A feedforward controller is designed to attenuate the impact with the aid of a sensor to detect external vibrations. Loop shaping in frequency domain and H_∞ method in state space are used to design the feedforward controller. The linear matrix inequality approach is adopted for solving the H_∞ feedforward control design problem. The application results in a 1.8-in disk drive with an accelerometer to measure acceleration signal show that 97% reduction of the position error signal is achieved with the feedforward control designed by the H_∞ method. The effectiveness of the two methods is also evaluated and compared when external vibration model is subjected to gain variations.
机译:本文考虑了H_∞补偿外部振动对硬盘驱动器定位精度的影响。前馈控制器设计为借助传感器来检测外部振动,以减轻影响。采用频域环路整形和状态空间中的H_∞方法设计前馈控制器。采用线性矩阵不等式方法求解H_∞前馈控制设计问题。该应用程序的结果是在一个带加速度计的1.8英寸磁盘驱动器中测量加速度信号,结果表明,使用H_∞方法设计的前馈控制可将位置误差信号降低97%。当外部振动模型受到增益变化时,还将评估和比较这两种方法的有效性。

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