Optimal H∞ control for hard disk drives with an irregular sampling rate
- Resource Type
- Conference
- Authors
- Nie, Jianbin; Sheh, Edgar; Horowitz, Roberto
- Source
- Proceedings of the 2011 American Control Conference American Control Conference (ACC), 2011. :5382-5387 Jun, 2011
- Subject
- Robotics and Control Systems
Power, Energy and Industry Applications
Signal Processing and Analysis
Communication, Networking and Broadcast Technologies
Components, Circuits, Devices and Systems
Computing and Processing
Welding
Integrated optics
Biological system modeling
Adaptive optics
- Language
- ISSN
- 0743-1619
2378-5861
This paper discusses the optimal H ∞ control synthesis via discrete Riccati equations for hard disk drives (HDDs) with an irregular sampling rate. A HDD servo system with an irregular sampling rate, caused by missing position error signal sampling data, is modeled as a linear periodically time-varying (LPTV) system. An optimal H ∞ track-following control algorithm for HDD servo systems with irregular sampling rates is proposed, which is based on the previous H ∞ synthesis results for LPTV systems developed by some of the authors. A simulation and implementation study demonstrates that the proposed control synthesis technique is able to handle the irregular sampling rate and can be used to conveniently design a loop-shaping track-following servo that achieves the robust performance of a desired error rejection function for disturbance attenuation. Implementation results on an actual hard disk drive validate the simulation results.