Inertial force measurement of an actuator arm of a hard disk drive in free oscillation by numerical analysis and experiments

Bin Gu; Dong-Wei Shu; Yusaku Fujii; Bao-Jun Shi

doi:10.1117/12.819622

31 December 2008 Inertial force measurement of an actuator arm of a hard disk drive in free oscillation by numerical analysis and experiments

Bin Gu, Dong-Wei Shu, Yusaku Fujii, Bao-Jun Shi

Author Affiliations +

Proceedings Volume 7130, Fourth International Symposium on Precision Mechanical Measurements; 71302A (2008) https://doi.org/10.1117/12.819622
Event: Fourth International Symposium on Precision Mechanical Measurements, 2008, Anhui, China

Abstract

In this paper, inertial force of an Actuator Arm of a Hard Disk Drive (HDD) in free oscillation after an impact load is accurately measured by means of a finite element analysis and by carrying out experiments using a modified Levitation Mass Method (LMM). A 3D finite element model of an actuator arm of a HDD is modeled in ANSYS/LS-DYNA using shell elements. An impact load, which is modeled as a half sine force pulse, is applied to a mass, which is attached with the Actuator Arm. The velocity and the inertial force of the mass in free oscillation are obtained from the simulation. In the LMM method, the arm is attached to a mass, i.e. the moving part of an aerostatic linear bearing, and the total force acting on the mass is measured as the inertial force of the mass using an optical interferometer. An impact is applied to the mass with the arm by colliding it to the metal base, and the inertial force of the arm is evaluated during the free oscillation. The velocity and the inertial force of the mass are calculated from the measured time-varying Doppler frequency shift. A good correlation between the experimental and numerical results is achieved. This numerical analysis can be further used to investigate the dynamic response of the actuator arm when it is subjected to different impact load, which is modeled with half sine force pulse with different pulse widths and amplitudes.

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Bin Gu, Dong-Wei Shu, Yusaku Fujii, and Bao-Jun Shi "Inertial force measurement of an actuator arm of a hard disk drive in free oscillation by numerical analysis and experiments", Proc. SPIE 7130, Fourth International Symposium on Precision Mechanical Measurements, 71302A (31 December 2008); https://doi.org/10.1117/12.819622

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KEYWORDS

Actuators

Finite element methods

Doppler effect

Interferometers

3D modeling

Numerical analysis

Velocity measurements

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