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http://dx.doi.org/10.5302/J.ICROS.2005.11.9.741

Anti-shock Controller Design for Optical Disk Drive Systems with a Nonlinear Controller  

Baek Jong-Shik (LG전자 DS연구소)
Chung Chung Choo (한양대학교 전기제어생체공학부)
Publication Information
Journal of Institute of Control, Robotics and Systems / v.11, no.9, 2005 , pp. 741-749 More about this Journal
Abstract
This paper presents a nonlinear controller design for optical disk drive systems to improve anti-shock performance. The nonlinear anti-shock controller is added parallel to the original linear servo control loop. In the previous work, a dead-zone nonlinear element is used for the nonlinear controller and a PID control method is used for the linear controller. Although this parallel structure of the controller improves anti-shock performance, it has a narrow stability bound. In this paper, the dead-zone with saturation nonlinear element is proposed for the nonlinear controller. Since this nonlinear element improves stability margin, we can use higher slope gain of dead-zone than that of nonlinear controller using dead-zone only. In the linear controller design, it is shown that the lead-lag control has an improved stability margin over PID control. Numerical simulation results and experimental results show that the proposed method can get better performance to the external shock than previously proposed methods.
Keywords
optical disk drive; anti-shock; nonlinear control; describing function; limit cycle criterion;
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