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TECHNICAL PAPERS

An Adaptive Parallel Observer System for Multirate Systems and Frequency-Aliased Output Measurements

[+] Author and Article Information
May-Win L. Thein

Department of Mechanical Engineering, University of New Hampshire, Durham, New Hampshire 03824-3591e-mail: mthein@cisunix.unh.edu

Eduardo A. Misawa

School of Mechanical and Aerospace Engineering, Oklahoma State University, Stillwater, Oklahoma 74078-5016e-mail: misawa@okstate.edu

J. Dyn. Sys., Meas., Control 125(3), 303-309 (Sep 18, 2003) (7 pages) doi:10.1115/1.1590684 History: Received April 11, 2001; Revised December 10, 2002; Online September 18, 2003
Copyright © 2003 by ASME
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References

Lu,  W., and Fisher,  D. G., 1992, “Multirate Adaptive Inferential Estimation,” IEE Proc.-D: Control Theory Appl., 139, pp. 181–189.
Ramachandran, P., Young, G. E., and Misawa, E. A., 1996, “Intersample Output Estimation With Multirate Sampling,” in Proceedings of the IEEE Conference on Control Applications, pp. 576–581.
Kando,  H., Aoyama,  T., and Iwazumi,  T., 1989, “Multirate Observer Design via Singular Perturbation Theory,” Int. J. Control, 50, pp. 2005–2023.
Shousse,  K. R., and Taylor,  D. G., 1995, “Discrete-Time Observers for Singularly Perturbed Continuous-Time Systems,” IEEE Trans. Autom. Control, 40, pp. 224–235.
Phillips, A. M., and Tomizuka, M., 1996, “Multirate Estimation and Control Under Time-Varying Data Sampling With Application to Information Storage Devices,” in Proceedings of the American Control Conference, pp. 4151–4155.
Hara, T., and Tomizuka, M., 1998, “Multi-Rate Controller for Hard Disk Drive With Redesign of State Estimator,” in Proceedings of the American Control Conference, pp. 3033–3037.
Thein, M. L., and Misawa, E. A., 1999, “A Parallel Observer System for Multirate State Estimation,” in Proceedings of the American Control Conference, pp. 3885–3889.
Thein, M. L., and Misawa, E. A., 2003, “A Parallel Observer System for Non-Deterministic Multirate Systems,” accepted for publication to the ASME J. Dyn. Syst., Meas., Control.
Suzuki,  T., Nakamura,  T., and Koga,  M., 1980, “Discrete Adaptive Observer With Fast Convergence,” Int. J. Control, 31, pp. 1107–1119.
Cooper, E. S., 1993, “Minimum Time Control With Minimum Vibration and With Power Limiting, With Application to the Magnetic Disk File,” Ph.D. thesis, Santa Clara University.
Lyle, T. R., and Rendon, T., 1998, “A Technical Report on a General Disk Drive Model,” Technical Memorandum ACL-98-009, Advanced Controls Laboratory, School of Mechanical & Aerospace Engineering, Oklahoma State University, Stillwater, OK.
Thein, M. L., Rendon, T., and Misawa, E. A., 1999, “A Genetic Algorithm for the Tuning of a Discrete Adaptive Observer Implemented on an IBM Head/Disk Assemby,” in Proceedings of the IEEE Conference on Control Applications, pp. 164–169.

Figures

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IBM HDA Actuator Dynamics
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Actual output and output observer estimate
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Actual velocity and velocity estimate
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Parameter estimate, a⁁1
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Parameter estimate, b⁁1
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Estimate error of a1 as a function of ωn and ζ
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Estimate error of b2 as a function of ωn and ζ
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Errors for extraction of ζ using DAO parameter estimates
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Errors for extraction of ωn using DAO parameter estimates

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