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Featured researches published by Takenori Atsumi.


advances in computing and communications | 2016

Analysis of unobservable oscillation in repeatable run-out for head-positioning system of hard disk drive

Takenori Atsumi

In a head-positioning system of hard disk drives (HDDs), unobservable oscillations in a repeatable run-out (RRO) may lead to destruction of user data. Therefore, this paper presents an estimation method for the unobservable oscillation in the RRO for the head-positioning control systems. This study is based on a relationship between an oscillation frequency and a sampling frequency of the head-positioning system. To estimate amounts of the unobservable oscillations in RROs, unobservable magnitudes are defined by using its maximum and root-mean-square values. These magnitudes show that a sampling frequency is an important parameter which designers must choose carefully so as not to destroy the users data by the unobservable RROs. To show a usage of the proposed method, unobservable magnitudes of RROs were analyzed for the head-positioning control system in a 7200-rpm HDD.


IEEJ journal of industry applications | 2016

Emerging Technology for Head-Positioning System in HDDs

Takenori Atsumi


Journal of Advanced Mechanical Design Systems and Manufacturing | 2016

Analysis of open-loop characteristics on SISO sampled-data positioning control system

Takenori Atsumi


Mechatronics | 2017

Minimization of unobservable oscillation in repeatable run-out for magnetic-head positioning system of hard disk drives☆

Takenori Atsumi


IEEJ journal of industry applications | 2017

Estimation Method of Unobservable Oscillations in Sampled-Data Positioning Systems

Takenori Atsumi


international conference on industrial technology | 2018

Coordinated system with tracking-position and flying-height controls for magnetic heads in HDDs

Takenori Atsumi


international conference on industrial technology | 2018

Improvement of H ∞ controller by using RBode plot for magnetic-head positioning system in HDDs

Jun Ito; Takenori Atsumi


The Proceedings of the Conference on Information, Intelligence and Precision Equipment : IIP | 2018

Controller Optimization for Dual-Actuator-System in HDDs with RBode plot

Jun Ito; Takenori Atsumi


Journal of Advanced Mechanical Design Systems and Manufacturing | 2018

Two-degree-of-freedom control scheme for flying-height and tracking-position controls with thermal actuators in HDDs

Takenori Atsumi


The Proceedings of the Conference on Information, Intelligence and Precision Equipment : IIP | 2017

Improvement of H∞ Controller by Using RBode Plot for Magnetic-Head-Positioning System in HDDs.

Jun Ito; Takenori Atsumi

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Jun Ito

Chiba Institute of Technology

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