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An adaptive on-line scheme is designed to identify the uncertain and time-varying resonance modes in hard disk drive servo systems. Based on the identified results, the uncertain resonance mode is extracted and a peak filter is designed accordingly to provide stronger capability of disturbance suppression. The scheme does not require any extra excitation signal nor additional signal processing for...
We propose an adaptive feedforward cancellation (AFC) scheme based on multirate discretization for compensation of periodic disturbance in hard disk drive servo systems. By discretizing the plant by a multirate scheme, we obtain the inverse of the closed-loop transfer function. Our scheme cancels selected repeatable runout (RRO) components more rapidly even when the disturbance signal is time-varying...
The recently developed generalized Kalman-Yakubovic-Popov (KYP) Lemma establishes the equivalence between a frequency domain property and a linear matrix inequality (LMI), and allows to solve a certain class of system design problems with multiple specifications on gain/phase properties over several frequency ranges. This paper applies the KYP lemma in a control design for microactuator to suppress...
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