Design and implementation of a hard disk drive servo system using robust and perfect tracking approach

Goh, Taedong; Li, Zhong‐Ming; Chen, B.M.; Lee, T.H.; Huang, Tony Jun

doi:10.1109/cdc.1999.833387

Cited by 14 publications

(17 citation statements)

References 8 publications

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“…For comparison, the robust and perfect tracking (RPT) controller proposed by Goh et al [6] was included and the closedloop step response is shown by the dashed line in Fig. 7.…”

Section: Rpt Controllermentioning

confidence: 99%

“…A typical plant model of HDD servo system includes a driver (power amplifier), a VCM and a rotary actuator that is driven by the VCM [7]. A magnetic head is supported by a suspension and carriage, and is suspended several micro-inches above the disk surface.…”

Section: The Physical Hdd Modelmentioning

confidence: 99%

“…Goh et al [6,7] proposed the method of robust and perfect tracking (RPT) for servo control system, which provides a better control performance as compared to conventional PID controllers. While the RPT controller has a simple first-order control structure and is capable of fully utilizing all the available information associated with the actual system, its performance depends on the selection of a parameter in a trial-and-error manner.…”

Section: Introductionmentioning

confidence: 99%

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Evolutionary design and implementation of a hard disk drive servo control system

et al. 2006

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The ever increasing demand for higher storage capacity and smaller magnetic hard disk drives have driven the need of developing a high performance head positioning servo control system. To meet the challenge, this paper presents the design and real-time implementation of a robust two-degree-of-freedom servo system for physical 3.5-in. hard disk drive with single voice-coil-motor actuator using a multi-objective evolutionary algorithm toolbox. Besides the simplicity in controller structure, such an evolutionary servo control system is capable of meeting various performance specifications of hard disk drives in both the time and frequency domains. It is shown that the servo system optimally moves the magnetic head onto the desired track with minimal control effort, and keeps it on the track robustly against plant uncertainties or runout disturbances. Validation results of the evolutionary servo control system are compared with classical PID and RPT controllers, which show excellent closed-loop response and robustness in the face of practical perturbations in HDD.

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“…For comparison, the robust and perfect tracking (RPT) controller proposed by Goh et al [6] was included and the closedloop step response is shown by the dashed line in Fig. 7.…”

Section: Rpt Controllermentioning

confidence: 99%

Section: The Physical Hdd Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Evolutionary design and implementation of a hard disk drive servo control system

et al. 2006

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“…For control, the following signals are used: (5) From this, the estimates, and , for the equivalent moment of inertia and the neural weights are (6) where a learning coefficient and a positive definite learning coefficient matrix are used. Employing ideas from [22], it can be shown that the VCMactuator-system is robustly stabilized by the tracking control law (7) so that the tracking error converges to zero despite the constant bounded bias force disturbance . However, it is important to understand from [22] that the estimation errors and remain bounded only.…”

Section: Adaptive Controller With Bias-force Compensationmentioning

confidence: 99%

“…For many years, the proximate time-optimal servo controller (PTOS) [4] has been a suitable solution for both issues. However, continued demand on closed-loop performance made it necessary to employ different control techniques for seeking, settling [25] and tracking [7], [13] using gain scheduling methods. In contrast, a single adaptive controller is presented in this brief which is also capable of dealing with friction disturbances.…”

Section: Introductionmentioning

confidence: 99%