• Proceedings of the Korea Institute of Convergence Signal Processing
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• 2001.06a
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• pp.129-132
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• 2001

she purpose of this paper is to propose an approach to suppress the vibration of three-mass inertia system based on the LMI theory. and confirm its validity through simulations under the condition of parameter variation. First, the existing $H_{\infty}$ servo problem is modified to a structure to which the LMI theory can be applied by virtue of the interval model principle. By adopting this structure, we can divide given specifications fur the vibration suppression problem into $H_2$and $H_{\infty}$ performance criteria. The results of simulation for the three-mass inertia system show that the proposed design approach is quite effective.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2005.05a
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• pp.494-497
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• 2005

Direct velocity feedback (DVFB) control with a collocated distributed actuator and point sensor pair is known that it offers a good stability with high performance when the control strategy is applied at the suppression of structural vibration. Also decentralized control method introduced to offer to reduce implementaion effort and malfunction due to failure in sensors and actuators of control system has become an important position in DVFB. In this paper, the decentralized control is compared with centralized control in terms of vibrational velocity reduction in a clamped-clamped beam.

• Proceedings of the KIPE Conference
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• 2014.11a
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• pp.131-134
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• 2014

PMSM(Permanent Magnet Synchronous Motor)은 가공기, 로봇, 공장 자동화 등 현재까지도 산업 시스템 전반에 널리 쓰이고 있으며, 그에 대한 연구도 활발히 진행되고 있다. 하지만 PMSM에 부하를 인가하거나 혹은 기계 몸체와의 결합 과정에서 기구부가 가지고 있는 고유진동 주파수에 의해 동력 전달 부분에 있어 기계계의 응답 특성은 불안정해지고, 떨림 현상이 발생된다. 본 논문에서는 PMSM을 이용한 회전 운동 시스템에서 출력되는 전류에 기구부가 가지고 있는 특정 영역의 고유진동 주파수를 제거한 전류를 적응 노치필터를 통해 내보낸다. 그 결과 기계부의 떨림 현상을 제거하고, 안정적인 제어 시스템을 제안한다. 이 제어알고리즘을 가상실험으로 필터 통과 전과 후의 결과를 비교 및 분석하도록 한다.

• Journal of Power System Engineering
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• v.3 no.4
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• pp.36-44
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• 1999

회로내에 capacitor를 부가 연결시켜 이론과 실험적으로 고찰한 새로운 기법의 연구이다. 종래에 사용되어 온 전자회로는 낮은 주파수의 진동진폭을 억제할 때에 큰 inductance 값을 필요로 하는 결점이 있었다. 이런 문제점을 해결하기 위하여 본 연구에서는 강화된 압전 분권회로에 병렬로 capacitor를 연결하도록 설계하였다. 새로운 기법은 기계적인 analogy 이론에 의해 증명을 하였으며, 알루미늄 보에 대하여 필요한 동조 모드에서 실험적으로 입증하였다. 따라서 이러한 결과들은 electronic passive damping 에 있어서 예전부터 요구되어 온 절반정도의 inductance값만으로도 구조물의 진동응답을 아주 심도 있게 감소시킬 수 있다는 것을 보여주고 있다.

• Journal of the Institute of Convergence Signal Processing
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• v.2 no.3
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• pp.65-72
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• 2001

Generally, it is said that control of the inertia system is to track the reference input quickly while suppressing the vibration due to the system itself. In this case, the difficulty fur designing a controller is caused by modeling uncertainty and parameter variation. The purpose of this paper is to propose a design method to suppress the vibration of three-mass inertia system based on the LMI theory. That is, the generalized plant model by which we can cope with conservativeness of the existing H$_{*}$ theory is proposed and analyzed in terms of LMI. The results of simulation fur the three-mass inertia system show that the proposed design approach is quite effective under the given situations.

• Journal of the Korean Institute of Telematics and Electronics T
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• v.35T no.3
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• pp.76-86
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• 1998

The Two-Mass Spring(TMS or Two-Inertia Resonance) system is one of the simplest models which generate a torsional vibration. In this system, it is required to design a controller achieving the control performance while suppressing the torsional vibration. In this paper, we compared and considered with the state feedback effects for the TMS system. By connecting each controller design to the state feedback control, we could predict each controller performances and decide weighting functions and parameters of LQ and $H_\infty$ controller.

• Proceedings of the KIPE Conference
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• 2012.07a
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• pp.293-294
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• 2012

본 논문에서는 H-브릿지 멀티레벨 인버터를 이용한 고전압 대용량 유도 전동기 구동을 위한 단순하고 강인한 속도 센서리스 제어를 소개하였다. H-브릿지 멀티레벨 인버터는 고전압 대용량화, 우수한 입출력 전력품질, 모듈화, 그리고 설치 조건 편의성으로 인해 고전압 대용량 유도 전동기 가변속 용도로 적용이 확대되고 있지만, V/F 운전시의 대표적인 단점인 저속 영역에서의 낮은 토오크, 무부하 혹은 경부하 조건의 전류 및 전동기 진동, 그리고 전동기 슬립에 의한 속도 변동은 대용량 유도 전동기의 인버터 적용에 걸림돌이 되고 있다. 따라서, 이러한 문제점을 극복하기 위해 속도 센서가 필요 없으며 전동기 상수에 강인한 속도 센서리스 제어를 전류 및 슬립 보상을 적용하여 유도 전동기의 기동 토오크 증대, 경부하 진동 억제, 그리고 속도 제어 특성을 향상 시켰다.

• 제어로봇시스템학회:학술대회논문집
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• 1993.10a
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• pp.931-936
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• 1993

Optimal model following control scheme is to design the controller which makes the response of real system follow that of desirable model. This kind of design scheme is developed for first order system. We extends the scheme for second order system regarding the characteristics of mechanical second order system for vibration suppression of flexible structures. The model of mechanical second order system is obtained using suitable damping ratios and natural frequencies. Using this scheme, we can design the good controller which uses the characteristic of second order system. Numerical examples are presented which were used optimal model following control scheme.

• Journal of the Institute of Convergence Signal Processing
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• v.4 no.3
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• pp.55-60
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• 2003

In the controller design of position or velocity control system, the flexibility of the mechanical system is always the limiting factor to the higher performance. Most mechanical systems coupled with rotary shaft are 2-Inertia systems which are consist of motor and load inertia. These inertias make a torsion In rotary shaft and cause torsional vibration. To suppress vibration, various control strategies have been proposed mainly for controlling 2-inertia system. In this paper, a speed controller design for a 2-inertia system composed of voltage controlled DC motor and load inertia is made by using CDM(coefficient diagram method). First, the 2-inertia system model is derived. Then the CDM is used to design the proper controller. A validity of this approach is confirmed by simulation and experimental results.

• Journal of the Korean Society for Precision Engineering
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• v.24 no.3 s.192
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• pp.67-75
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• 2007

This paper deals with a problem of vibration suppression of a piezoelectric beam using a self-sensing algorithm. Two methods, which are PPF(positive position feedback) and SRF(strain rate feedback), are considered to suppress a residual vibration of a piezoelectric beam developed during the step positioning of a beam end point. A self-sensing algorithm treated here is basically a strain rate estimator of a beam movement and is to be used for the closed loop control. The efficacy of the proposed idea is evaluated through experiments.