The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper proposes filtering methods to cancel the impulsive disturbance contained in position error signal (PES) in hard disk drives (HDDs). The impulsive disturbances may be observed as a few single sudden changes or some consecutive changes in PES. The filtering includes impulsive disturbance identification and estimation. A recursive method is used to determine the dynamic boundaries for identification...
Hard disk drives (HDDs) encounter a challenge of large storage capacity demand. A particular problem a HDD faces is that a periodic disturbances caused by different sources. These disturbances which do not change drastically will degrade the performance of voice coil motor actuator based servo system so that significant repeatable run-out is formed in position error signal. This paper shows a method...
A control design method which combines the generalized Kalman-Yakubovich-Popov (KYP) lemma and the H2 control is proposed to attenuate specific narrowband disturbance and simultaneously minimize the positioning error of the control system. Two specific narrowband disturbance near the bandwidth are rejected sufficiently via the KYP lemma based design, and moreover the enhancement of the overall positioning...
This paper investigates the disturbance rejection problem for a data storage servo system that contains a microactuator for high-accuracy positioning. For disturbances with known frequencies, their rejection is accomplished via the generalized Kalman-Yakubovic-Popov lemma together with the Youla parameterization approach, and a linear controller is computed via solving a number of linear matrix inequalities...
This paper focuses on compensation for external vibration effect on the positioning accuracy of hard disk drives. A feedforward controller is designed to attenuate the effect 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 application results in a 1.8-inch disk drive with an accelerometer...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.