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High‐bandwidth design of hard disk control system using H ∞ control with feedback‐type uncertainty
Author(s) -
Hirata Mitsuo,
Hasegawa Yumi
Publication year - 2010
Publication title -
electrical engineering in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.136
H-Index - 28
eISSN - 1520-6416
pISSN - 0424-7760
DOI - 10.1002/eej.21025
Subject(s) - feed forward , bandwidth (computing) , multiplicative function , control theory (sociology) , broadband , computer science , robustness (evolution) , feedback control , robust control , control system , control (management) , engineering , control engineering , mathematics , electrical engineering , telecommunications , mathematical analysis , biochemistry , chemistry , artificial intelligence , gene
In hard disk drives, it is important to enlarge the control bandwidth in order to shorten the track pitch for larger data capacity. However, it is difficult for the H ∞ control method to increase the control bandwidth if the mechanical resonance modes have uncertainty. This is because the robustness of the H ∞ control method is assured by the small‐gain theorem for additive or multiplicative perturbation and the control bandwidth is limited by the uncertainty. In this study, we propose an H ∞ control method for high‐bandwidth design by introducing a new uncertainty model with a feedforward and a feedback path in order to reduce the conservatism of robust design. The effectiveness is shown by numerical simulations. © 2010 Wiley Periodicals, Inc. Electr Eng Jpn, 173(4): 54–62, 2010; Published online in Wiley Online Library ( wileyonlinelibrary.com ). DOI 10.1002/eej.21025