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US 9,064,533 B2Granted
Tape friction measurement
AssigneeInternational Business Machines Corporation
InventorsReed A. Hancock, Randy C. Inch, Eiji Ogura
Life of this patent
Estimating the term…
Abstract
According to one embodiment, a method includes determining whether a primary velocity is valid and/or in a steady state; averaging a velocity error over a predetermined time period upon determining the primary velocity is valid and/or in a steady state; and calculating a new friction value based on the averaged velocity error.
Claims25
A method, comprising:
- determining whether a primary velocity of a tape is valid and/or in a steady state;
- accumulating a velocity error over a predetermined time period upon determining the primary velocity is valid and/or in a steady state;
- and
- calculating a friction value based at least in part on an average of the accumulated velocity error.
1 more element
A system, comprising:
- a magnetic head;
- a drive mechanism for passing a magnetic medium over the magnetic head;
- and
- a controller electrically coupled to the magnetic head, wherein the controller is configured and/or programmable to:
- determine whether a primary velocity of a tape is valid and/or in a steady state;
- accumulate a velocity error over a predetermined time period upon determining the primary velocity is valid and/or in a steady state;
- calculate a friction value based at least in part on an average of the accumulated velocity error;
- and
- adjust a motor speed of the drive mechanism based on the friction value.
6 more elements
A computer program product, the computer program product comprising:
- a non-transitory computer readable storage medium having program instructions embodied therewith, the program instructions readable and/or executable by a processor to cause the processor to:
- determine whether a primary velocity of a tape is valid and/or in a steady state;
- accumulate a velocity error over a predetermined time period upon determining the primary velocity is valid and/or in a steady state;
- and
- calculate a friction value based at least in part on an average of the accumulated velocity error,
- wherein the velocity error is represented by a difference between the primary velocity and a reference velocity.
3 more elements
Dependencies are inferred from the claim text.