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Robust optimal design of the FDBs in a HDD to reduce NRRO and RRO

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Abstract

This research proposes a robust optimal design methodology of the FDBs in a HDD to reduce RRO and NRRO. The critical mass, which determines the dynamic behavior of rotor-bearing system, was selected as an objective function, and the constraint equations were the friction torque of the FDBs, and the stiffness and damping coefficients related with under-damped vibration modes. Ten major design variables of the FDBs were chosen in this optimization problem. The steady-state whirl radius and the shock response at half-speed whirl of the rotating rigid spindle-bearing system were evaluated as RRO and NRRO, respectively. RRO and NRRO of the optimal design were compared with those of conventional one, and it showed that the proposed method could effectively reduce RRO and NRRO.

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Acknowledgments

This work was supported by Samsung Electro-Mechanics Co. Ltd. and by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (2010-0021919).

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Correspondence to Gunhee Jang.

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Lee, J., Jang, G. & Ha, H. Robust optimal design of the FDBs in a HDD to reduce NRRO and RRO. Microsyst Technol 18, 1335–1342 (2012). https://doi.org/10.1007/s00542-012-1539-4

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  • DOI: https://doi.org/10.1007/s00542-012-1539-4

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