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 or additional signal processing for the parameter identification. Compared with the conventional method, the rates of learning and error convergence are increased dramatically. The scheme can provide good stability margin at high frequency to the variation of the resonance frequency and the peak gain. Simulation results show the validity and effectiveness of the proposed scheme.
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