Computer Disk File Track Accessing Controller Design based upon Cell-to-Cell Mapping

The concept of cell-to-cell mapping is proposed for the track accessing controller design of computer disk file actuators. Conventional design approach uses the classical bang-bang control theory. The result does not include any structural resonance of the actuator, and the constraints are only imposed in an ad hoc fashion. No optimization results can be claimed. By working with the cell-to-cell mapping, the structural resonance can be included without any additional difficulty, and the constraints can also be included in the consideration while still satisfying the optimal control requirement. The results showed that when pure inertia model is assumed, classical bang-bang control configuration for the velocity profile is still obtained. When more complex model is used, the classical bang-bang control does not achieve optimization. A more delicate velocity profile is thus necessary.