Hard Disk Drive Control Using H-Infinity, LQR, PID, and Pole Placement Methods

This document addresses hard disk drive control problems utilizing H-infinity control, Linear Quadratic Regulator (LQR), PID control, and pole placement techniques. To comprehensively solve these control challenges, we conduct in-depth research into the advantages and limitations of each control method and their practical performance in real applications. The implementation includes MATLAB code for each controller type: H-infinity control using robust optimization algorithms, LQR with state-weighting matrices Q and R tuning, PID with proportional-integral-derivative gain optimization, and pole placement through Ackermann's formula or state feedback design. Each method is accompanied by detailed analysis reports examining transient response, stability margins, and disturbance rejection capabilities. Furthermore, we explore potential improvements and optimization strategies such as gain scheduling for nonlinear systems and modern control enhancements. The final deliverable constitutes a complete technical report with simulation results, code documentation, and practical implementation guidelines for hard disk drive control applications.