Abstract
In conventional hard disk drives, a control system compensates for the mechanical resonance above the Nyquist frequency by using sampled-data control theories or multirate control techniques. However, such a control system can only avoid instability and cannot suppress disturbances above the Nyquist frequency. In response to this problem, a control system design method that suppresses disturbances beyond the Nyquist frequency is proposed. This method uses the frequency responses of a controlled object and a digital controller to calculate the gain of the sensitivity function in a sampled-data system without requiring complex calculations involving matrices. When the method was applied to the head-positioning system of a hard disk drive, the experimental results showed that the control system suppressed disturbances that had the frequencies higher than the Nyquist frequency.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
