• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2015.07a
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• pp.507-508
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• 2015

본 논문에서는 알 수 없는 주파수의 정현파외란(sinusoidal disturbance)을 가지는 선형시불변(linear time-invariant) 시스템에 대해 그 외란의 주파수 추정과 억제를 목표로 하는 알고리즘을 설계한다. 제시된 알고리즘은 주파수 추정을 위한 적응관측기(adaptive observer)와 외란 제거를 위한 출력조정기(output regulator)로 구성된다. 기존에 연구에 비하여 모델불확실성에 대한 강인성은 유지하면서 제어기의 초기값(initial value) 설정에 의존하지 않는 안정도 및 성능을 가진다. 제안된 알고리즘은 외란의 주파수를 완벽하게 추정하며, 그 정보를 바탕으로 외란 제거 성능을 보장할 수 있다. 또한, 실제 광디스크 시스템(optical disc drive systems)에 대한 시뮬레이션을 통하여 그 효과를 보여준다.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 1994.10a
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• pp.402-407
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• 1994

유연한 구조물의 진동문제에 대해 Filtered-X LMS 알고리즘을 이용한 제어계를 구성하고 디지탈 신호처리보드를 이용하여 실시간 제어를 수행하였다. 엑추에이터는 피에조 세라믹을 사용하였고 정현파 및 잡색잡음 가진 형태의 외란을 가하였다. 실험결과 1차 고유주파수에서 7dB 이상의 진동저감을 할 수 있었으며 관심 주파수영역 내에서 진동이 고르게 저감되었다.

• Transactions of the Korean Society for Noise and Vibration Engineering
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• v.14 no.9 s.90
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• pp.827-836
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• 2004

In this paper, we design a robust multi-objective track-following controller that satisfies transient response specifications and diminishes the influence of sinusoidal disturbance. To this end, a robust control problem with the multiple constraints is considered. We show that a sufficient condition satisfying the robust control problem can be expressed by linear matrix inequalities. Finally, the robust track-following controller can be designed by solving an LMI optimization problem. The effectiveness of the proposed controller design method is verified though experiments.

• Journal of Institute of Control, Robotics and Systems
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• v.8 no.8
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• pp.682-690
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• 2002

This paper presents an output feedback controller design method for uncertain linear systems with sinusoidal disturbance of uncertain frequencies. The controller needs to compensate for the performance deterioration due to the uncertain frequencies of sinusoidal disturbance. To this end, we introduce a virtual system including the dynamics corresponding to the uncertain frequencies and design a controller which minimizes the output difference between the virtual system and the closed-loop system. In other words, the controller is designed so that the closed-loop system approximates the virtual system. The feedback controller is achieved by solving an LMI optimization problem involving a robust $H_{\infty}$ constraint. The advantages of the proposed design method are examined by comparing it with a design method that only minimizes the $H_{\infty}$ norm of the transfer function between the sinusoidal disturbance and the output. The proposed design method is applied to the track-following system of rewritable optical disk drives and is evaluated through an experiment.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.10 no.4
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• pp.659-666
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• 2006

Servo-motors are used as key components of automated system by performing precise motion control as accurate positioning and accurate speed regulation in response to the commands from computers and sensors. Especially, the linear brushless servo-motors have numerous advantages over the rotary servo motors which have connection with the friction induced transfer mechanism such as ball screws, timing belts, rack/pinion. This paper proposes an estimation method of unknown motor system parameters using the informations from the sinusoidal driving type linear brushless DC motor dynamics and outputs. The estimated parameters can be used to tune the controller gain and a disturbance observer. In order to meet this purpose high performance Digital Signal Processor, TMS320F240, designed originally for implementation of a Field Oriented Control(FOC) technology is adopted as a controller of the liner BLDC servo motor. Having A/D converters, PWM generators, rich I/O port internally, this servo motor application specific DSP play an important role in servo motor controller. This linear BLDC servo motor system also contains IPM(Intelligent Power Module) driver and hail sensor type current sensor module, photocoupler module for isolation of gate signals and fault signals.