Sage Journals: Discover world-class research

Abstract

As DVD players become standard auxiliary parts in vehicles, environmental vibration from harsh driving conditions may cause unacceptable rates of focusing errors. This article presents the implementation of an adaptive servo controller for DVD drives to suppress focusing errors caused by vibrations transmitted through the chassis of a recreational vehicle. This study is divided into two parts: (1) The design and construction of an optical disk drive platform mounted on a vibrating shaker created to imitate a vehicle system in various driving situations, and (2) the realization of adaptive feedforward servo control (AFSC) techniques using the modified variable step-size filtered-x-LMS algorithm (MVSS-FXLMS) in the optical disk drive employed. Experimentation indicates that the feedforward signal generated as an anti-vibration input by the adaptive controller can effectively suppress the focusing errors introduced by the environmental vibration disturbance in vehicle systems.

Keywords

Vibration disturbances adaptive feedforward servo control DVD drive vehicle system

Get full access to this article

View all access options for this article.

References

Aboulnasr, T. and Mayyas, K. , 1997, “A robust variable step-size LMS-type algorithm: Analysis and simulation,” IEEE Transactions on Signal Processing 45(3), 631-639 .

Cohen, D. , Gee, W. , Ludeke M. , and Lewkowicz, J. , 1984, “Automatic focus control: The astigmatic lens approach,” Applied Optics 23, 565-570 .

Haykin, S. , 2002, Adaptive Filter Theory, Prentice-Hall, Englewood Cliffs, NJ .

Huang, Sh.-H. , Zuo, G.-J. , Chen Ch.-M. , and Chen, Sh.-J. , 2004, “Adaptive feedforward focusing system of DVD players,” (in Chinese) in Proceedings of Opto-Electronic Technical Conference, paper No. PE-SA2-01.

Imagawa, S. , Suzuki, M. , Ono, H. , and Ohya, J. , 2001, “Actuator control to suppress disturbances for 8cm DVD RAM video camera recorder,” IEEE Transactions on Consumer Electronics 47(3), 528-533 .

Kuo, S. M. and Morgan, D. R. , 1996, Active Noise Control Systems -Algorithms and DSP Implementations, Wiley, New York, NY .

Kwong, R. H. and Johnston, E. W. , 1992, “A variable step size LMS algorithm,” IEEE Transactions on Signal Processing 40(7), 1633-1642 .

Pan, M.-Ch. and Wu, M.-D. , 2006, “Dynamic investigation and adaptive tracking-error improvement of an optical disk drive,” (in revised-version review) Asian Journal of Control.

Sristi, P. , Lu, W. S. , and Antoniou, A. , 2001, “A new variable-step-size lms algorithm and its application in subband adaptive filtering for echo cancellation,” in IEEE International Symposium on Circuits and Systems 2, 721-724 .

10.

Tanaka, Y. , Sunohara, M. , Murata, J. , Nakamura, T. , and Aikoh, H. , 1994, “Molded-glass optical element for focusing servos,” Applied Optics 44(22), 108-112 .

11.

Wei, W.-T. and Pan, M.-Ch , 2005, “Implementation and application of adaptive focusing control for DVD drives in vehicle systems,” in Proceedings of 2005 CACS Automatic Control Conference, paper No. Z00003d.

12.

Yokoyama, E. , Nagasawa, M. , and Katayama, T. , 1994, “A disturbance suppression control system for car-mounted and portable optical disk drives,” IEEE Transactions on Consumer Electronics 40(2), 92-99 .

Adaptive Focusing Control of DVD Drives in Vehicle Systems

Abstract

Keywords

Get full access to this article

References