A design method ? based on a shock-response-spectrum analysis ? for reducing acoustic noise of a seeking control system in a hard disk drive

Okuyama, Atsushi; Hamaguchi, Tetsuya; Watanabe, Keiko; Horiguchi, Takao; Shishida, K.; Nishimura, Yukio

doi:10.1007/s00542-003-0323-x

Cited by 14 publications

(8 citation statements)

References 4 publications

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“…By using this index, we can estimate effect of the unobservable oscillations caused by mechanical resonances. Moreover, this study employs the shock response spectrum (SRS) analysis that handles the transient-state characteristics of mechanical resonances [Smallwood (1981); Okuyama et al (2003); Lalanne (2003)]. The results of this study are confirmed through track-seeking experiments on a HDD.…”

Section: Introductionmentioning

confidence: 88%

Unobservable Settling Vibration on Head-Positioning Control in Hard Disk Drives

Atsumi

Messner

2011

IFAC Proceedings Volumes

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Section: Introductionmentioning

confidence: 88%

Unobservable Settling Vibration on Head-Positioning Control in Hard Disk Drives

Atsumi

Messner

2011

IFAC Proceedings Volumes

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“…One kind of acoustic noise in HDDs is seeking noise generated by seeking operation. Seeking noise has been assumed to originate from transient vibrations, not steady vibrations, in the mechanical parts (13) . Therefore, bumpless switching is needed to reduce this noise.…”

Section: Servo System In Hard Disk Drivesmentioning

confidence: 99%

Controller Switching Strategy for Constrained Systems and Its Application to Hard Disk Drives

Okuyama

Yamaguchi

2007

JAMDSM

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We propose a switching control strategy for systems with state and control constraints. Prior studies have proven that switching control strategies have the ability to meet performance objectives, such as fast response and good disturbance rejections, while avoiding constraint violations. The controller is selected on-line from a given set of controllers by supervisory rules based on the concept of a maximal output admissible set. The selected controller needs to be appropriately initialized during switching, but how to decide the controller's initial state is still a problem. This paper proposes a method that utilizes an initial value compensation (IVC) technique for determining the initial state of the controller. The IVC technique has the following features. First, the controller's initial state is chosen according to the plant's initial state. Therefore, the number of variables that the supervisory rules need to consider is reduced. Second, smooth and fast transient responses can be obtained after switching, therefore the region of the closed-loop initial state variables that satisfy the desired response specifications under the given constraints can be expanded. Experimental evaluations of the proposed switching control strategy were performed with a 2.5-inch form-factor hard disk drive.

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“…Theoretical approaches to the IVC have mostly appeared in the HDD community [7][8][9][10][11][12][13][14]. Design methods based on pole placement ideas [8,9] and linear-quadratic optimizations [7,8] are proposed.…”

Section: Initial Value Compensationmentioning

confidence: 99%

“…One of the acoustic-noises in an HDD is a seeking noise generated by a seeking operation. It is assumed that the seeking noise originates from transient vibrations, not steady vibrations, of the mechanical parts [13]. Therefore, bumpless switching is needed for reducing the seeking noise.…”

Section: A Servo System In Hard Disk Drivesmentioning

confidence: 99%

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Controller switching strategy for constrained systems and its application to hard disk drives

Okuyama

Yamaguchi

9th IEEE International Workshop on Advanced Motion Control, 2006.

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We propose a switching control strategy for systems with state and control constraints. Prior studies have proven that switching control strategies have the ability to meet performance objectives, such as fast response and good disturbance rejections, while avoiding constraint violations. The controller is selected on-line from a given set of controllers by supervisory rules based on the concept of a maximal output admissible set. The selected controller needs to be appropriately initialized during switching, but how to decide the controller's initial state is still a problem. This paper proposes a method that utilizes an initial value compensation (IVC) technique for determining the initial state of the controller. The IVC technique has the following features. First, the controller's initial state is chosen according to the plant's initial state. Therefore, the number of variables that the supervisory rules need to consider is reduced. Second, smooth and fast transient responses can be obtained after switching, therefore the region of the closedloop initial state variables that satisfy the desired response specifications under the given constraints can be expanded. Experimental evaluations of the proposed switching control strategy were performed with a 2.5-inch form-factor hard disk drive.I.

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A design method ? based on a shock-response-spectrum analysis ? for reducing acoustic noise of a seeking control system in a hard disk drive

Cited by 14 publications

References 4 publications

Unobservable Settling Vibration on Head-Positioning Control in Hard Disk Drives

Unobservable Settling Vibration on Head-Positioning Control in Hard Disk Drives

Controller Switching Strategy for Constrained Systems and Its Application to Hard Disk Drives

Controller switching strategy for constrained systems and its application to hard disk drives

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