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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...
Friction compensation via position measurement only in hard disk drives (HDD) is considered in this paper. A robust nonlinear adaptive controller is designed which uses only the motor position (i.e., the output) for feedback and does not require knowledge of electromechanical system parameters, such as parameters in the friction model, rotor inertia, etc. Reduced-order Lunberger observer is introduced...
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...
In hard disk drives (HDDs), the movement of the read/write (R/V) head is driven by voice-coil-motor (VCM) which is supported by a pivot cartridge consisting of a pair of preloaded ball bearings. The pivot friction nonlinearity is defined as the frictional hysteresis that occurs at the bearing of the actuator pivot in the hard disk drives. This nonlinear effect can be observed as a large gain reduction...
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