Vibration cancellation in a disk drive by using an...

Details Vibration cancellation in a disk drive by using an... Vibration cancellation in a disk drive by using an...

2005-07-05

2005-07-05

Hudspeth, David (Department: 2651)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

C360S077020, C360S077060

Reexamination Certificate

active

06914743

ABSTRACT:
Disclosed is a disk drive using an accelerometer to sense linear vibration and cancel its effects with an adaptive algorithm during track following. The accelerometer is oriented to detect acceleration associated with torque that tends to cause the actuator to move off-track notwithstanding the efforts of the servo control system. The accelerometer's filtered output is used to modify the control effort. The disk drive uses the position error signal to adaptively filter the accelerometer's output in an effort to mathematically converge on a set of optimal filter coefficients and thereby reduce the effect of vibration that may otherwise impose a torque on the actuator.

REFERENCES:
patent: 5299075 (1994-03-01), Hanks
patent: 5521772 (1996-05-01), Lee et al.
patent: 5663847 (1997-09-01), Abramovitch

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