Taming disk/spindle vibrations through aerodynamic bearings and acoustically tuned-mass dampers

Bittner, H.; Shen, I. Y.

doi:10.1109/20.753793

Cited by 24 publications

(4 citation statements)

References 5 publications

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“…The disk flutter amplitudes were reduced 40-60% with this technique. A squeeze air film between a plate and a rotating disk was found effective in suppressing the disk flutter, as reported by Bittner and Shen (1999), Ono and Maeda (2000) and Deeyiengyang and Ono (2001). All these methods are passive control techniques, which either modified the configuration of the disk drive castings and aerodynamics of the disks, or increased the dynamic damping of the disk.…”

Section: Introductionmentioning

confidence: 67%

An experimental study on feedback control of rotating disk flutter

Huang

Hoque

Wang

2005

Journal of Fluids and Structures

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Section: Introductionmentioning

confidence: 67%

An experimental study on feedback control of rotating disk flutter

Huang

Hoque

Wang

2005

Journal of Fluids and Structures

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“…Guo and Downloaded by [Stony Brook University] at 02:10 20 October 2014 Chen (2001) analyzed the impact of disk flutter on servo performance. Bittner and Shen (1999) proposed an acoustically tuned-mass damper to suppress the disk flutter by use of an air bearing plate above the top disk. As a means of suppressing the disk flutter, on the other hand, Deeyiengyang and Ono (2001) proposed a squeeze air damping by simply setting a flat surface close to the disk with a clearance of less than 300 m, which resulted in a significant effect of damping the flutter.…”

Section: Introductionmentioning

confidence: 99%

Feedback Control of Disk Vibration and Flutter by Distributed Self-Sensing Piezoceramic Actuators^#

Yan¹,

Chen²,

Dou³

et al. 2008

Mechanics Based Design of Structures and Machines

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This paper investigates the effect of suppressing the vibration/flutter of a spinning disk-spindle system using a distributed, self-sensing actuator (DSSA), which was made by piezoceramic patches and pasted on the cover of hard disk drives (HDDs). Both the sensing and the actuating effect of the active piezoceramic layer was conducted through experiments, after which the out-ofplane and in-plane vibrations of the top disk were measured with and without the feedback control of DSSA. The effectiveness of DSSA was illustrated on plate structure control, both in time domain and frequency domain. Then the same procedure was conducted on hard disk. The magnitudes of vibration and disk flutter that were induced by the surrounded airflow, ball bearing, and the resonant frequencies of the system could be significantly decreased to a large percent. The distributed DSSA can be pasted on either inside or outside the hard disk on the cover based on the requirements of convenience or commercial cost.

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“…Heo et al [ 18 ] presented another control method, which used a better aerodynamic design of the shroud contour on the base casting to reduce the disk flutter. Bittner et al [ 19 ] proposed an acoustically tuned-mass damper to suppress disk flutter through an air bearing plate on top of the disk. By applying a squeeze film damping to a commercially available HDD, Deeyiengyang et al [ 20 ] conducted experiments to study the effect of clearances between squeeze film and disk surface on suppressing vibration of spinning disk/spindle systems.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Sensing and Feedback Control for Vibration/Flutter of Rotating Disk by PZT Actuators via Air Coupled Pressure

Yan

Xü

Han

et al. 2011

Sensors

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In this paper, a feedback control mechanism and its optimization for rotating disk vibration/flutter via changes of air-coupled pressure generated using piezoelectric patch actuators are studied. A thin disk rotates in an enclosure, which is equipped with a feedback control loop consisting of a micro-sensor, a signal processor, a power amplifier, and several piezoelectric (PZT) actuator patches distributed on the cover of the enclosure. The actuator patches are mounted on the inner or the outer surfaces of the enclosure to produce necessary control force required through the airflow around the disk. The control mechanism for rotating disk flutter using enclosure surfaces bonded with sensors and piezoelectric actuators is thoroughly studied through analytical simulations. The sensor output is used to determine the amount of input to the actuator for controlling the response of the disk in a closed loop configuration. The dynamic stability of the disk-enclosure system, together with the feedback control loop, is analyzed as a complex eigenvalue problem, which is solved using Galerkin’s discretization procedure. The results show that the disk flutter can be reduced effectively with proper configurations of the control gain and the phase shift through the actuations of PZT patches. The effectiveness of different feedback control methods in altering system characteristics and system response has been investigated. The control capability, in terms of control gain, phase shift, and especially the physical configuration of actuator patches, are also evaluated by calculating the complex eigenvalues and the maximum displacement produced by the actuators. To achieve a optimal control performance, sizes, positions and shapes of PZT patches used need to be optimized and such optimization has been achieved through numerical simulations.

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Taming disk/spindle vibrations through aerodynamic bearings and acoustically tuned-mass dampers

Cited by 24 publications

References 5 publications

An experimental study on feedback control of rotating disk flutter

An experimental study on feedback control of rotating disk flutter

Feedback Control of Disk Vibration and Flutter by Distributed Self-Sensing Piezoceramic Actuators^#

Optimization of Sensing and Feedback Control for Vibration/Flutter of Rotating Disk by PZT Actuators via Air Coupled Pressure

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Taming disk/spindle vibrations through aerodynamic bearings and acoustically tuned-mass dampers

Cited by 24 publications

References 5 publications

An experimental study on feedback control of rotating disk flutter

An experimental study on feedback control of rotating disk flutter

Feedback Control of Disk Vibration and Flutter by Distributed Self-Sensing Piezoceramic Actuators#

Optimization of Sensing and Feedback Control for Vibration/Flutter of Rotating Disk by PZT Actuators via Air Coupled Pressure

Contact Info

Product

Resources

About

Feedback Control of Disk Vibration and Flutter by Distributed Self-Sensing Piezoceramic Actuators^#