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Vibration analysis of HDD actuator with equivalent finite element model of VCM coil

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Abstract

As the rate of increase in areal density of the HDD has accelerated, dynamic characteristics of the HDD actuator need to be improved with respect to the performance of the tracking servo and shock transmission. Therefore, it is important to analyze the vibration characteristic of the HDD actuator that consists of the VCM part, E-block and pivot bearing. In this paper, vibration modes of the HDD actuator are investigated the using finite element and experimental modal analyses methods. To develop a detailed finite element model, finite element models of each components of the actuator assembly are constructed and tuned to the results of the EMA. The VCM coil is modeled as an equivalent finite element model that has an orthotropic material property using auto-model updating program. Auto-model updating program with improved sensitivity based iterative method is applied to build a detailed finite element model using the result of the EMA. A detailed finite element model of the HDD actuator is then constructed and analyzed.

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Abbreviations

α:

Weighting factor

E x,Ey,Ez :

Young’s modulus

Gxy,Gxz,Gyz :

Shear elastic modulus

ν xy,νxy,νzy :

Poission’s ratio

λ i :

Eigen-value

N:

The number of modal parameters

M:

The number of design variables

θ i :

Modal parameter

ζj :

Design variable

φi :

Eigen-vector

φC :

Calculated eigen-vector

φT :

Measured eigen-vector

θT :

Reference modal parameter vector

θ C :

Predicted modal parameter vector

Δθ:

Error vector for modal parameters

ζu :

Updated design variable vector

ζo :

Current design variable vector

Δζ:

Modification vector of design variables

[S]:

Sensitivity matrix

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Authors and Affiliations

  1. Department of Mechanical Engineering, Yonsei University, Shinchon-dong 134, Sudaemoon-ku, 120-749, Seoul, Korea

    Dong-Woohn Kim

  2. MANDO Corporation, USA

    Jin Koo Lee

  3. Center for Information Storage Device(CISD), Yonsei University, Shinchon-dong 134, Sudaemoon-ku, 120-749, Seoul, Korea

    No-Cheol Park

  4. Department of Mechanical Engineering, Yonsei University, Shinchon-dong 134, Sudaemoon-ku, 120-749, Seoul, Korea

    Young Pil Park

Authors
  1. Dong-Woohn Kim
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  2. Jin Koo Lee
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  3. No-Cheol Park
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  4. Young Pil Park
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Correspondence to No-Cheol Park.

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Kim, DW., Lee, J.K., Park, NC. et al. Vibration analysis of HDD actuator with equivalent finite element model of VCM coil. KSME International Journal 17, 679–690 (2003). https://doi.org/10.1007/BF02983863

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  • DOI: https://doi.org/10.1007/BF02983863

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