Vibration Control Above the Nyquist Frequency in Hard Disk Drives
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...
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| Veröffentlicht in: | IEEE transactions on industrial electronics (1982) 2008-10, Vol.55 (10), p.3751-3757 |
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| container_end_page | 3757 |
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| container_issue | 10 |
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| container_title | IEEE transactions on industrial electronics (1982) |
| container_volume | 55 |
| creator | Atsumi, T. Okuyama, A. Nakagawa, S. |
| description | 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. |
| doi_str_mv | 10.1109/TIE.2008.928153 |
| format | Article |
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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. 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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.</description><subject>Control systems</subject><subject>Control systems design</subject><subject>Control theory</subject><subject>Digital</subject><subject>Digital control</subject><subject>Disk drives</subject><subject>Disturbances</subject><subject>Electric variables control</subject><subject>Frequency</subject><subject>Gain</subject><subject>Hard disk drive</subject><subject>Hard disks</subject><subject>Magnetic heads</subject><subject>Magnetic variables control</subject><subject>Mathematical analysis</subject><subject>motion control</subject><subject>Nyquist frequencies</subject><subject>Resonance</subject><subject>Vibration control</subject><issn>0278-0046</issn><issn>1557-9948</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2008</creationdate><recordtype>article</recordtype><sourceid>RIE</sourceid><recordid>eNqF0T1PwzAQBmALgUQpzAwsFgNMae34Kx6rftBKFSyF1XIcR7ikcbGTSv33pApiYIDpludOd_cCcIvRCGMkx5vVfJQilI1kmmFGzsAAMyYSKWl2DgYoFVmCEOWX4CrGLUKYMswGYPLm8qAb52s49XUTfAUnuT9Y2Lxb-Hz8bF1s4CLYz9bW5ghdDZc6FHDm4gecBXew8RpclLqK9ua7DsHrYr6ZLpP1y9NqOlknhlLZJIZomhZSaGOsEcTI3ObaEJtjhoo8Y2lhpGTcYmOKUmujUVlqgTXOuRaCF2QIHvu5--C7bWKjdi4aW1W6tr6NSiLCqZQy_VdmgiFGM0o6-fCnJJSKFDPcwftfcOvbUHf3qox3_xYY8Q6Ne2SCjzHYUu2D2-lwVBipU0aqy0idMlJ9Rl3HXd_hrLU_mnLChSTkC2ARjM4</recordid><startdate>20081001</startdate><enddate>20081001</enddate><creator>Atsumi, T.</creator><creator>Okuyama, A.</creator><creator>Nakagawa, S.</creator><general>IEEE</general><general>The Institute of Electrical and Electronics Engineers, Inc. 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| ispartof | IEEE transactions on industrial electronics (1982), 2008-10, Vol.55 (10), p.3751-3757 |
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| language | eng |
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| source | IEEE Electronic Library (IEL) |
| subjects | Control systems Control systems design Control theory Digital Digital control Disk drives Disturbances Electric variables control Frequency Gain Hard disk drive Hard disks Magnetic heads Magnetic variables control Mathematical analysis motion control Nyquist frequencies Resonance Vibration control |
| title | Vibration Control Above the Nyquist Frequency in Hard Disk Drives |
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