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External vibration compensation via loop shaping and Hfeedforward control design for hard disk drives in mobile applications
2007 Edition, October 1, 2007 - IEEE - Institute of Electrical and Electronics Engineers, Inc.

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...

Robust Hcompensation for external vibration on hard disk drives in mobile applications
2008 Edition, March 1, 2008 - IEEE - Institute of Electrical and Electronics Engineers, Inc.

Compensation for external vibration impact on the positioning accuracy of hard disk drives is considered with the presence of actuator uncertainty in this paper. The low-frequency mode change due to actuator pivot nonlinearity of the...

Multirate control for head actuator assembly vibration compensation with an accelerometer
2002 Edition, January 1, 2002 - IEEE - Institute of Electrical and Electronics Engineers, Inc.

In order to significantly improve the servo bandwidth, this paper studies the vibration compensation in the head actuator assemblies of hard disk drives. The proposed technique can make hard disk servo systems meet tighter requirements...

Following control of hard disk drives using multi-rate H/sub /spl infin// control -experimental study
2002 Edition, Volume 5, January 1, 2002 - IEEE - Institute of Electrical and Electronics Engineers, Inc.

In the head-positioning control of hard disk drives, the measurement sampling period cannot be changed. However, it is possible to select control period arbitrarily. Therefore, multi-rate control can improve the control performance without...

An improved mixed H/sub 2//H/sub /spl infin// control design for hard disk drives
2005 Edition, Volume 13, September 1, 2005 - IEEE - Institute of Electrical and Electronics Engineers, Inc.

In this brief, we propose a new mixed H/sub 2//H/sub /spl infin// control design via a linear matrix inequality (LMI) based approach. By an equivalent transformation of Lyapunov matrix inequality, additional slack variables are introduced to...

Fiber optic sensor for monitoring vibration load
2016 Edition, October 1, 2016 - IEEE - Institute of Electrical and Electronics Engineers, Inc.

An important factor affecting the operation of any mechanical unit is the vibration of its individual components. Therefore, the development of tools for the continuous monitoring of vibration loads at critical points in the design of assemblies and...

Nanoscale stability and active control in hard disk drives
2004 Edition, January 1, 2004 - IEEE - Institute of Electrical and Electronics Engineers, Inc.

To achieve the areal density goal in hard disk drives of 1 Tbit/in/sup 2/ the minimum physical spacing between the slider and disk must be reduced to less than 5 nm. At such low spacing new nanoscale forces act between the slider and...

Adaptive Loop Shaping for Wideband Disturbances Attenuation in Precision Information Storage Systems
2017 Edition, Volume 53, May 1, 2017 - IEEE - Institute of Electrical and Electronics Engineers, Inc.

Modern hard disk drive (HDD) systems are subjected to various external disturbances. One particular category, defined as wide-band disturbances, can generate vibrations with their energy highly concentrated at several frequency bands. Such vibrations are...

Process Improvement to Reduce Defects from Magnetic Reader Resistance Failure in Hard Disk Drive
2011 Edition, September 1, 2011 - IEEE - Institute of Electrical and Electronics Engineers, Inc.

This paper illustrates an application of the FMEA method to study and analyze the defect causes in order to reduce the defects from failure of the magnetic reader head used in the 3.5-inch desktop hard disk drive assembly process. The failure ratio...

Comparison and design of servo controllers for dual-stage actuators in hard disk drives
2003 Edition, Volume 39, September 1, 2003 - IEEE - Institute of Electrical and Electronics Engineers, Inc.

A systematic design procedure is presented that can be used to construct servo controllers for dual-stage actuation in a hard disk drive. The systematic approach is based on optimal control theory using an H/sub /spl infin//-norm-based...

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