Vibration suppression of HDD spindle-disk system using piezoelectric shunt damping

This work presents the feasibility of the piezoelectric shunt damping for vibration suppression of the rotating HDD disk-spindle system. A target vibration mode which significantly restricts the recording density increment of the drive is determined through modal analysis and a piezoelectric bimorph is designed to suppress unwanted vibration. The shunt circuit is constructed by considering two-dimensional electromechanical coupling coefficient of the shunted drive. In addition, optimal design process using sensitivity analysis is undertaken in order to improve the shunt damping of the system. The effectiveness of the proposed methodology is verified through experimental implementation by observing the displacement transmissibility of the system in frequency domain.

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