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hard disk drives CONTROL IN MOBILE APPLICATIONS

Journal of Systems Science & Complexity 2007年第2期20卷 215-224页

作者： Shuzhi Sam GE Beibei REN Tong Heng LEE Department of Electrical and Computer Engineering National University of Singapore Singapore 117576 Singapore Faculty of Engineering National University of Singapore Singapore 119260 Singapore

In this paper, control design is investigated for hard disk drives in mobile applications with unknown external arbitrarily fast time-varying disturbances. The disturbances can be estimated with exponential accuracy using the proposed disturbance observer based on a series of integral filters. The position error signal will converge to zero with the proposed control technique for systems subjected to the unknown disturbances. The effectiveness of the proposed method is demonstrated by extensive simulation studies.

关键词： hard disk drives time-varying disturbances

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OPTIMAL TRACK SEEKING CONTROL OF DUAL-STAGE ACTUATOR FOR HIGH DENSITY hard disk drives

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Acta Mechanica Solida Sinica 2006年第4期19卷 297-306页

作者： Zhou Haomiao Wang Jie Zhou Youhe Zheng Xiaojing Department of Mechanics and Engineering Science College of Civil Engineering and Mechanics Lanzhou University Lanzhou 730000 China

Based on generalized the variation method, by introducing Hamilton function and Lagrange multiplier, this paper proposed a linear quadratic optimal control strategy for an incomplete controllable system with fixed terminal state and time. Applying the proposed optimal control to the simple two-input dual-stage actuator magnetic head positioning system with three degrees-of-freedom, the simulation results show that the system has no residual vibration at the terminal position and time, which can reduce the total access time during head positioning process. To verify the validation of the optimal control strategy of three degrees-of-freedom spring-mass models in actual magnetic head positioning of hard disk drives, a finite element model of an actual magnetic head positioning system is presented. Substituting the optimal control force from simple three degrees-of-freedom spring-mass models into the finite element model, the simulation results show that the magnetic head also has no residual vibration at the end of track-to-track travel. That is to say, the linear quadratic optimal control technique based on simple two-input dual- stage actuator system with three degrees-of-freedom proposed in this paper is of high reliability for the industrial application of an actual magnetic head positioning system.

关键词： hard disk drives optimal track seeking control generalized variation method residual vibrationless

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Discrete-time H2 Optimal Reset Control with Application to HDD Track-following

Discrete-time H2 Optimal Reset Control with Application to H...

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2009中国控制与决策会议

作者： Hui Li~(1,2),Chunling Du~2,Youyi Wang~1 1.School of Electrical and Electronic Engineering,Nanyang Technological University,Singapore. 2.Data Storage Institute,A*STAR,Singapore

This paper proposes a design method of discrete-time reset control systems with the reset time instants pre-specified. With a base linear system designed conventionally,the discrete-time reset law design aims at improving disturbance suppression of the *** design method can be converted to a standard H optimal control problem and the solution of the controller is obtained by solving Riccati *** proposed reset controller design method is applied to track following stage of a hard disk drive servo system.

关键词： disturbance rejection hard disk drives optimal reset control H2 control

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