Damper factors affecting the natural frequency of the HDD actuator arm
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Abstract
This research employed finite element simulation to study the damper factors affecting the natural frequency of the HDD actuator arm by calculating the natural frequency of the HDD actuator arm in the bending, torsion, and sway mode shapes. The accuracy of the simulation was verified by comparing with the PSV400 test results for the natural frequency of the HDD actuator arm without a damper, which had a maximum error of 7.82 percent in the bending and sway mode shapes of the arm side. Finite element simulation, which aimed to investigate the factors of thickness, modulus of elasticity, and damper mounting positions, the damper thickness was varied in three values: 0.11 mm, 0.15 mm, and 0.19 mm. The modulus of elasticity of the damper was mutable in three values: 197 GPa, 200 GPa, and 203 GPa, along with three damper mounting positions: bottom, middle, and end of the HDD actuator arm. The simulation results demonstrated that mounting a damper on the bottom and middle position of the HDD actuator arm increased the natural frequency in the bending and torsion mode shapes of the arm side. The natural frequency in the bending and sway mode shapes of the arm side decreased when a damper was mounted at the end position of the HDD actuator arm. In all mode shapes, the natural frequency reduced when a high thickness and modulus of elasticity damper were positioned at the end of the HDD actuator arm.
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References
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