Free Vibration Analysis of a Spinning Flexible Disk–spindle System Supported by Ball Bearing and Flexible Shaft Using the Finite Element Method and Substructure Synthesis

Jang, Gil-Jin; Lee, S.H; Jung, Mun Seung

doi:10.1006/jsvi.2001.3984

Cited by 39 publications

(17 citation statements)

References 9 publications

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“…5), with fixed boundary condition at its inner radius and undergoing the infinitesimal rigid-body motion as well as an elastic deformation, are compared with those found by Jang et al [4] ( Table 1). The disk has an outer diameter of 47·5 mm, an inner diameter of 15 mm and a thickness of 0·8 mm.…”

Section: Validationmentioning

confidence: 95%

“…Flowers and Ryan [2] and Flowers and Wu [3] examined coupled disk-spindle dynamics for turbomachinery applications. Jang et al [4] carried out a free-vibration analysis of a spinning flexible disk-spindle system supported by a ball bearing and a flexible shaft using the finite-element method and substructure synthesis. Lee [5] and Lim [6] examined the coupled vibration of disk-spindles in the context of hard-disk drives.…”

Section: Disk Flexible Shaftmentioning

confidence: 99%

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Vibration analysis of a rotating flexible shaft–disk system

2006

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Free vibrations of a spinning disk-shaft system are analysed using the finite-element method. The spinning disk is described by the Kirchhoff plate theory. The shaft is modelled by a rotating beam. Using Lagrange's principle and including the rigid-body translation and tilting motion, equations of motion of the spinning flexible disk and shaft are derived consistently to satisfying the geometric compatibility conditions on the internal boundaries among the substructures. The finite-element method is then used to discretize the derived governing equations. The method is applied to the shaft-disk spinning system. The sensitivity to the running speed as well as the effect of both disk flexibility and boundary condition on the natural frequencies of the spinning system are numerically investigated.

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Section: Validationmentioning

confidence: 95%

Section: Disk Flexible Shaftmentioning

confidence: 99%

Vibration analysis of a rotating flexible shaft–disk system

2006

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“…Vibration of a spinning flexible disk-spindle system supported by ball bearings has been studied in ref. [18] considering the nonlinearity of the spinning disk. In ref.…”

Section: Spinning Diskmentioning

confidence: 99%

“…With the increase in spinning speed, the centrifugal forces and the Coriolis' forces will have a greater effect on the dynamics of the disk. There are a few papers that studied the shock response of the HDD considering the nonlinearities of the spinning disk [18,19]. Vibration of a spinning flexible disk-spindle system supported by ball bearings has been studied in ref.…”

Section: Spinning Diskmentioning

confidence: 99%

Modeling of hard disk drives for shock and vibration analysis – consideration of nonlinearities and discontinuities

et al. 2007

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This paper reviews recent advances (mostly after year 2000) in shock and vibration analysis of hard disk drives (HDD) considering the presence of nonlinearities and discontinuities. Components and dynamic phenomena in HDD where effects of mechanical nonlinearity and discontinuities are significant are discussed, e.g., head actuator suspension, dimple and slider, head-disk interface, fluid dynamic bearing, spinning disks, and load/unload dynamics. Ways to model these nonlinearities and discontinuities are reviewed in detail. Our research on modeling an entire HDD in operating mode subject to shock and vibration using a flexible multibody dynamics formulation is also presented. The numerical simulation of the shock response of a 1-in. form factor HDD is presented. A halfsinusoidal acceleration shock is applied at the base of the HDD. Response of the flying height for different shock amplitudes and duration times is simulated.

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“…The advantage of the multi-body dynamic formulations is a faster computation time and relative ease of remodeling when some design parameters or components are changed. The method has been applied to vibration analysis of disks/spindle system (Jang et al 2002;Shen et al 2004;Tsing et al 2003;Shen and Ku 1997). We have applied the method to analyze a simple shock problem of HAA (Gao et al 2005).…”

Section: Introductionmentioning

confidence: 99%

Shock analysis of non-operating hard disk drives based on a multibody dynamic formulation

et al. 2005

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Dropping, striking, or bouncing a hard disk drive (HDD) against a hard surface can damage it internally without external evidence of damage. Contact with a hard ground will lift the slider off the disk surface and then slap back on the surface. A drive that is subjected to this type of shock may fail on initial use or the reliability of the drive may degrade over time. Therefore, industry has a lot of interest on the shock conditions that cause a slider to lift off the disk surface. Finite element software such as ANSYS/LS-DYNA is often used to analyze this shock problem. However, this method consumes a great amount of time. It is also difficult to perform design parameter studies because it requires re-analysis of the model of the entire HDD system when certain design variables are changed. This paper presents a flexible multi-body dynamics formulation to analyze the shock problem of non-operating HDDs. Governing equations of motion of the voice coil motor (VCM)-actuators assembly and the disks-spindle system are derived using a Lagrangian formulation. By introducing constraint equations between the slider and the disk surface, the shock response of the whole HDD system has been obtained. Numerical results show that the method is reasonable and the acceleration amplitude which makes the slider lift off can be determined in a significantly shorter time than by the conventional approach. Finally, the effect of drive parameters on shock resistance, such as shock duration and slider resting location are analyzed.

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Free Vibration Analysis of a Spinning Flexible Disk–spindle System Supported by Ball Bearing and Flexible Shaft Using the Finite Element Method and Substructure Synthesis

Cited by 39 publications

References 9 publications

Vibration analysis of a rotating flexible shaft–disk system

Vibration analysis of a rotating flexible shaft–disk system

Modeling of hard disk drives for shock and vibration analysis – consideration of nonlinearities and discontinuities

Shock analysis of non-operating hard disk drives based on a multibody dynamic formulation

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