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filled2 - ME 475 Spring 2011 Disk Drive Head Positioning...

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ME 475 Spring 2011 1 Slide 1 ME 475 Session 2: Principle of Feedback Control Galen King Purdue University Disk Drive Head Positioning Objective : to precisely locate the head over the disk Options : 1) Open-loop control (without feedback) 2) Closed-loop control (with feedback) Slide 2 ME 475 Session 2: Principle of Feedback Control Galen King Purdue University Open-Loop Control $ ( %FTJSFE 5SBDL 1PTJUJPO "DUVBM )FBE 1PTJUJPO .PUPS 7PMUBHF $POUSPMMFS .PUPS
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ME 475 Spring 2011 2 Slide 3 ME 475 Session 2: Principle of Feedback Control Galen King Purdue University Open-Loop Control (with Disturbance) $ ( %FTJSFE 5SBDL 1PTJUJPO "DUVBM )FBE 1PTJUJPO .PUPS 7PMUBHF $POUSPMMFS .PUPS 7PMUBHF %JTUVSCBODF + + Slide 4 ME 475 Session 2: Principle of Feedback Control Galen King Purdue University Introduce Feedback $POUSPMMFS 1MBOU 3±T² :±T² + ± $ ( /±T² %±T² + + + + R(s): reference input signal for desired action D(s): disturbance signal acting on plant N(s): noise signal corrupting the measurement
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filled2 - ME 475 Spring 2011 Disk Drive Head Positioning...

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