Low-hump sensitivity function design for dual-stage HDD systems with different microactuators
Low-hump sensitivity function design for dual-stage HDD systems with different microactuators
- Author(s): C. Du ; G. Guo ; D. Wu
- DOI: 10.1049/ip-cta:20045024
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- Author(s): C. Du 1 ; G. Guo 1 ; D. Wu 2
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View affiliations
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Affiliations:
1: Data Storage Institute (DSI), Singapore
2: School of EEE, Nanyang Technological University, Singapore
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Affiliations:
1: Data Storage Institute (DSI), Singapore
- Source:
Volume 152, Issue 6,
November 2005,
p.
655 – 661
DOI: 10.1049/ip-cta:20045024 , Print ISSN 1350-2379, Online ISSN 1359-7035
The paper focusses on a control design that aims to achieve a low hump sensitivity function for dual stage servo systems in hard disk drives. Two microactuator models are studied, a MEMS (microelectromechanical system) actuator and a PZT (piezoelectric) actuator. A nearly flat sensitivity function is accomplished in the continuous-time domain for the dual-stage servo loop using the H∞-loop shaping method and an LMI (linear matrix inequality) approach. The implementation result for the parallel dual-stage system with a PZT-actuated suspension demonstrates the effectiveness of the proposed design and the hump of the sensitivity function is shown to be lower than 3 dB.
Inspec keywords: hard discs; linear matrix inequalities; piezoelectric actuators; continuous time systems; sensitivity analysis; microactuators; disc drives
Other keywords:
Subjects: Control system analysis and synthesis methods; Storage on moving magnetic media; Algebra; Microactuators
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