Berkeley MECENG 140 - Design and Analysis of a Dual-Stage Disk Drive Servo System (6 pages)

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Design and Analysis of a Dual-Stage Disk Drive Servo System



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Design and Analysis of a Dual-Stage Disk Drive Servo System

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Pages:
6
School:
University of California, Berkeley
Course:
Meceng 140 - Combustion Processes
Combustion Processes Documents

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WeA16 5 Proceeding of the 2004 American Control Conference Boston Massachusetts June 30 July 2 2004 Design and Analysis of a Dual Stage Disk Drive Servo System Using an Instrumented Suspension Xinghui Huang Ryozo Nagamune Roberto Horowitz and Yunfeng Li Abstract This paper presents the design and analysis of a track following controller using a mixed objective optimization technique for dual stage servo systems in hard disk drives HDD The objective of minimizing tracking error in the presence of plant uncertainties and operational variations is formulated into a framework of multi objective minimization The tracking error minimization is reasonably formulated as an H2 norm minimization problem while the robust stability issue is addressed by some H norm bounds These norm minimization or constraints are then translated into a set of parametric feasibility conditions using linear matrix inequalities LMI which are readily solved by convex optimization solvers To enhance tracking performance and stability robustness attenuation of airflow excited suspension structural vibration is also explicitly taken into consideration by an inner loop fast rate damping and compensation controller utilizing a vibration sensor on the suspension surface Analysis and simulation results show a noticeable improvement in tracking performance over a previous designs while retaining acceptable robust stability under certain multiplicative and parameter uncertainties I I NTRODUCTION Dual stage actuation which combines a normal voice coil motor VCM actuator and a secondary microactuator MA placed close to the head has been studied intensively as a means of achieving higher track densities hence higher data capacity in HDDs by increasing the servo bandwidth The design and optimization of trackfollowing controllers have been studied by many researchers over the past years These works vary from decoupled or sequential single input single output SISO classical frequency shaping design techniques



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