A disturbance observer approach to detecting and rejecting narrow-band disturbances in hard disk drives
Qixing Zheng; Tomizuka, M.
Advanced Motion Control, 2008. AMC apos;08. 10th IEEE International Workshop on
Volume , Issue , 26-28 March 2008 Page(s):254 - 259
Digital Object Identifier   10.1109/AMC.2008.4516075
Summary:This paper presents a servo compensator to detect and reject narrow-band disturbances in the non-repeatable runout (NRRO) for hard disk drives (HDDs). A disturbance observer (DOB) with a band-pass Q filter is used to detect the presence of the narrow-band disturbance. Once the disturbance is detected, the frequency of the disturbance is identified by the least mean squares (LMS) algorithm. Based on the frequency estimate, a narrow band-pass Q filter centered at the estimated frequency is applied to the DOB to compensate for the disturbance. The performance of this compensator is demonstrated by simulation on an open-source realistic hard disk drive model.

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