Modal Testing and Finite Element Modelling of Subsystem in Hard Disk Drive

Xu, Limei; Guo, Ningqun

doi:10.1006/mssp.2002.1508

Cited by 17 publications

(16 citation statements)

References 6 publications

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“…Jang and Park presented a numerical method to analyze the electromechanical variables of a spinning disk-spindle system, and they showed a possibility to detect the free-falling HDD by monitoring the electromechanical signals of a spindle motor (Jang and Park 2005). Also, many researchers have presented the dynamic characteristics and proposed designs for an actuator assembly, or actuator servo control algorithms to compensate for the vibration and various disturbances during the head positioning process of a HDD (Wang et al 2000;Onuki and Ishioka 2001;Arisaka et al 2003;Xu and Guo 2003). However, most of the work has investigated the disk-spindle system or actuator separately in electromagnetic or mechanical fields or both fields, and they did not investigate the electromechanical variables of an actuator due to the change in the electromechanical variables of the rotating disk-spindle of an operating HDD.…”

Section: Introductionmentioning

confidence: 98%

Investigation of the electromechanical variables of the spindle motor and the actuator of a HDD due to positioning and free fall

Jang

Park

Kim³

et al. 2006

Microsyst Technol

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This research investigates the electromechanical variables of a spindle motor and an actuator of an operating hard disk drive (HDD) due to the positioning and the free-fall of a HDD. Magnetic fields of a brushless DC motor and a voice coil motor are determined by the time-stepping finite element equation of the Maxwell equation and the driving circuit equation. The pressure of the fluid dynamic bearings (FDBs) is determined by solving the finite element equation of the Reynolds equation to calculate the reaction force and the friction torque. Dynamic equations of the rotating disk-spindle, actuator, and stationary bodies of a HDD are derived from the Newton-Euler's equation. The speed control of the rotating disk-spindle and the servo control of the actuator are included to describe the head positioning between the rotating disk and the head. The simulation is performed to investigate the electromechanical variables of the spindle motor and the actuator due to the positioning and the free-fall of a HDD. This research shows that the positioning and the free-fall of a HDD change the electromechanical variables of the spindle motor and the actuator of an operating HDD, and that monitoring their electromechanical variables may identify the positioning and the free-fall of a HDD without using extra sensors.

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Section: Introductionmentioning

confidence: 98%

Investigation of the electromechanical variables of the spindle motor and the actuator of a HDD due to positioning and free fall

Jang

Park

Kim³

et al. 2006

Microsyst Technol

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“…Effect of the butterfly mode was investigated using finite element analysis. Xu and Guo [5] experimentally studied on the residual vibration of the head actuator assembly in hard disk drives. Yuan et al [6] numerically studied the static pressure and surface shear forces on a rotating, umbrella-deformed disk in an open shroud.…”

Section: Introductionmentioning

confidence: 99%

Heat transfer and flow characteristics in the hard disk drive tester

Naphon

Ratchaneekorn

Kurujareon

2009

International Communications in Heat and Mass Transfer

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“…Structural characteristics of head stack assembly have been investigated by several researchers such as Jiang and Miles (1999), Xu and Guo (2003), Gao et al (2006), and so on. Kubotera et al (2002), Tsuda et al (2003), Shimizu et al (2003) have conducted numerical simulations to investigate flow structure around a carriage arm and the aerodynamic characteristics concerning 3.5 in.…”

Section: Introductionmentioning

confidence: 99%

Aerodynamic characteristics of carriage arm equipped on hard magnetic disks

2007

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In order to study aerodynamic characteristics of a carriage arm equipped on hard disk drives, water tunnel tests with ten times enlarged models of an actual arm were conducted based on Reynolds number similitude, which allows the time scale of the phenomena about 1,300 times slower than that compared with the phenomena under actual operation condition in the air. In the tests, flow visualization around the arm model with fluorescent dye injection and laserlight sheet technique was carried out. Fluid dynamic drag, lift and torque on the model were also measured. The effects of the oncoming flow velocity and profile, the installation angle and position of the arm and the configuration of the trailing edge of the arm on the power spectral density of the fluid dynamic force were investigated. As a result, predominant spectrum peak, the Strouhal number of which is about 0.24, is found in the power spectral density of dynamic lift force on the arm. The flow visualization confirmed that the dynamic lift with the spectral peak originates from the alternating vortex shedding from the trailing edge of the arm. The peak rapidly decreases as the installation angle increases while the velocity profile of oncoming flow and the position of the arm in the gap direction have little effect on the peak component. Furthermore, it was demonstrated that the dynamic lift can be reduced by modification of trailing edge shape of the arm.

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Modal Testing and Finite Element Modelling of Subsystem in Hard Disk Drive

Cited by 17 publications

References 6 publications

Investigation of the electromechanical variables of the spindle motor and the actuator of a HDD due to positioning and free fall

Investigation of the electromechanical variables of the spindle motor and the actuator of a HDD due to positioning and free fall

Heat transfer and flow characteristics in the hard disk drive tester

Aerodynamic characteristics of carriage arm equipped on hard magnetic disks

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