Measurement and Sources of Lateral Tape Motion: A Review

2008 ◽  
Vol 131 (1) ◽  
Author(s):  
Bart Raeymaekers ◽  
Frank E. Talke
Keyword(s):  
Magnetic Tape ◽  
Measurement Methods ◽  
Track Density ◽  
Tape Drive ◽  
Edge Contact ◽  
Lateral Tape Motion ◽  
Dual Stage ◽  
Tension Transients ◽  
Tape Edge ◽  
Dual Stage Actuator

The sources of lateral tape motion in a tape drive are reviewed. Currently used measurement methods and models for lateral tape motion are analyzed and compared. The effect of roller run-out, tape edge contact, and tape tension transients on lateral tape motion is discussed. A dual stage actuator tape head is investigated to improve track-following capability and increase the track density on a magnetic tape.

Dynamic Modeling and Control of a Piezo-Electric Dual-Stage Tape Servo Actuator

2008 ◽  
Author(s):  
Uwe Boettcher ◽  
Bart Raeymaekers ◽  
Raymond A. de Callafon ◽  
Frank E. Talke
Keyword(s):  
Low Frequency ◽  
Voice Coil Motor ◽  
Step Response ◽  
Time Model ◽  
Modeling And Control ◽  
Micro Actuator ◽  
Single Output ◽  
Lateral Tape Motion ◽  
Dual Stage ◽  
Dual Stage Actuator

We have implemented the design of a dual-stage actuator tape head for enhanced reduction of lateral tape motion (LTM) disturbance. Our design consists of a conventional voice coil motor (VCM) and a micro-actuator for coarse and fine positioning, respectively. The micro-actuator, which is mounted on the VCM, uses a piezo crystal and allows following LTM up to the kHz regime, while the VCM follows low frequency LTM. Using step response measurements and a realization algorithm, we have created a multi-input discrete-time model of the dual-stage actuator. Based on the model, we designed and implemented a dual-stage controller, using a dual-input single-output approach based on a PQ method. The dual-stage controller controls the position of both actuators and enables an increased track-following bandwidth along with a control signal that is smaller in magnitude than that for a conventional single-stage tape head.

Characterization of Tape Edge Contact Force With Acoustic Emission

2007 ◽  
Vol 129 (4) ◽  
pp. 525-529 ◽  
Author(s):  
Bart Raeymaekers ◽  
Frank E. Talke
Keyword(s):  
Acoustic Emission ◽  
Contact Force ◽  
Operating Conditions ◽  
Dimensional Model ◽  
Tape Drive ◽  
Edge Contact ◽  
One Dimensional ◽  
Acoustic Emission Sensors ◽  
Tape Edge

Acoustic emission sensors were used to detect contact between a moving tape and the flange of a tape guide. The influence of tape drive operating conditions on the tape edge contact force was studied. A one-dimensional model was developed to predict the magnitude of tape/flange impact. The model fits the experimental data well.

High frequency lateral tape motion and the dynamics of tape edge contact

2005 ◽  
Vol 11 (8-10) ◽  
pp. 1166-1170 ◽  
Author(s):  
Ryan J. Taylor ◽  
Frank E. Talke
Keyword(s):  
High Frequency ◽  
Edge Contact ◽  
Lateral Tape Motion ◽  
Tape Edge

Head-Wear Measurements by Autoradiography of the Worn Magnetic Tapes

1986 ◽  
Vol 108 (1) ◽  
pp. 22-28 ◽  
Author(s):  
B. Bhushan ◽  
G. W. Nelson ◽  
M. E. Wacks
Keyword(s):  
Magnetic Tape ◽  
Wear Debris ◽  
Zinc Ferrite ◽  
Tape Drive ◽  
Average Amount ◽  
Nickel Zinc ◽  
Total Head ◽  
Drive Component

The transfer of wear debris of a nickel-zinc ferrite head to a magnetic tape was measured by autoradiography of the tape after it was worn against the irradiated ferrite head. Ferrite deposits on the tape were observed only after 5000 passes. Dots or specks on the autoradiograph of the tapes of about 200 micrometers in diameter, caused by particles of ferrite about 1 μm in diameter and mass of about 10−11 g, were measured. The average amount of ferrite deposited on the tape after 20,000 passes was about 0.6 nanogram per square centimeter; some areas showed uniform deposits of ferrite concentration of 10–20 ng/cm2. Based on our estimates of total head wear, only a small fraction (about 0.6 percent) of the total ferrite wear debris was transferred to the tape, about 0.2 percent was transferred to the tape-drive component surfaces, and the rest, we conclude, was airborne.

Single vs. Dual Stage Actuators: Why and When

2002 ◽  
Author(s):  
Fu-Ying Huang ◽  
Tetsuo Semba ◽  
Matthew White
Keyword(s):  
System Dynamics ◽  
Single Stage ◽  
Actuator Dynamics ◽  
Dual Stage ◽  
Dual Stage Actuator

Higher TPI HDD requires lower disturbance and higher error rejection capability. One of the limitations to achieve high error rejection capability is the dynamics of the actuator. Dual stage actuator (DSA) has been considered to replace single stage actuator (SSA) someday because of system dynamics difference and more freedom in servo design that may avoid the constraint of single stage actuator dynamics on servo. SSA and DSA were compared based on their dynamics, servo designs, and TMR benefits. The extendibility and limitations of both systems were studied. The criteria on when DSA would be implemented are also discussed.

Sliding Mode and PID Control of a Dual Stage Actuator for Precision Positioning

2014 ◽  
Vol 47 (3) ◽  
pp. 6550-6555 ◽  
Author(s):  
Shingo Ito ◽  
Juergen Steininger ◽  
Georg Schitter
Keyword(s):  
Pid Control ◽  
Sliding Mode ◽  
Precision Positioning ◽  
Dual Stage ◽  
Dual Stage Actuator
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