Time optimal control of a disc drive actuator with vibro-acoustic constraints
US5668680A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 4, 1996 |
| Grant date | Sep 16, 1997 |
| Priority date | — |
| Expiry date | Mar 4, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/5547
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method for optimizing the demand velocities in a disc drive velocity profile using both time and vibro-acoustic constraints. An accurate, high-order dynamic model of the disc drive is formulated which describes the vibro-acoustic output of the drive in response to actuator coil current input, taking into account the disc drive actuator structure and the electrical response of the disc drive servo circuit. From this dynamic model, the shortest possible seek time is determined for a selected seek length which can achieve a vibro-acoustic output below a selected, maximum limit, as well as settling within a specified tolerance of the target track. Once the shortest possible seek time is determined, the demand velocity values in the velocity profile are selected so as to minimize the maximum position error during the seek settle. The demand velocity values are subsequently provided in a look up table for use during a seek by the disc drive servo circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.