• 대한기계학회논문집A
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• 제26권2호
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• pp.329-339
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• 2002

In ship operation the consequency of roll motions can seriously degrade the performance of mechanical and personnel effectiveness. So many studies for the roll stabilization control system design have been performed and very good results have been achieved. In many studies, the stabilizing fins are used. Recently rudders, which have been extensively modified, have been used to exclusively to stabilize the roll. This paper examines the two-degree-of-freedom servosystem design technique to synthesize the yaw control system which achieves the course keeping object of the ship and the H$_{\infty}$ control approach to suppress the roll motion, respectively.

• 한국생산제조학회지
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• 제22권4호
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• pp.755-760
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• 2013

The dynamics of the winder roller of a roll-to-roll printing system for printed electronics is a time-varying system because of the variation of the winder roller radius owing to rewinding or unwinding of the web. Therefore, an adaptive control method considering the time-variant characteristics is required for precise tension control. In this study, the variable PID gain method is applied to the actual roll-to-roll system and verified by experiments for unwinder tension control. The required value of the winder roller radius for the application of the variable PID gain is estimated from the measurement of the winder tension and winder motor torque. The simulation results as well as experimental results show that the fixed PID gain control cannot stabilize the tension of the winder roller with varying winder roller radius. On the other hand, the variable PID gain method can control the tension of the winder roller regardless of the winder roller radius.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2010년도 추계학술대회 논문집
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• pp.269-270
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• 2010

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2011년도 춘계학술대회 논문집
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• pp.677-678
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• 2011

• 실천공학교육논문지
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• 제15권1호
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• pp.127-132
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• 2023

Roll to Roll (이하 RTR)로 연결된 유연회로기판(이하 FPCB)에서 일정한 장력을 유지하여 안정적인 홀 가공이 가능하게 하는 Dancer Roll System를 경량화하고 서보모터를 활용한 토크 제어를 통해 기존 방식 FPCB RTR에서는 대응 불가능하였던 중력가속도의 2배가 되는(이하 2.0G) 가속도의 고속 가공이 가능하도록 요소기술과 성능 지표를 제시한다. 기존 마그넷 클러치 방식 RTR에서는 달성이 불가능하였던 높은 회전수와 발열 문제, 낮은 토크 문제등을 마그네슘 소재를 이용한 Roll의 경량 가공법 개발과 서보모터의 토크 제어 알고리즘 개발을 통하여 해결하여 FPCB에 균일한 장력을 제공하고 토크 안정성을 높인다. 본 연구에서 개발한 요소 기술로 인해 Dancer Roll의 반응속도가 개선되어 목표한 고속화를 달성하였다.

• 한국전산유체공학회:학술대회논문집
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• 한국전산유체공학회 2005년도 추계 학술대회논문집
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• pp.87-91
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• 2005

A conceptual design for the movable roll vane system is done for the roll stability control of KSLV-I. The control effectiveness of the roll vanes is estimated using the numerical simulation. The hinge location is selected to minimize the torque requirement at the maximum dynamic pressure condition, and the maximum torque of 3.0 kN-m is found to be required to actuate the roll vanes for the entire range of operation. An electro-mechanical actuator system which is composed of a DC motor, the speed reducers, the battery package and the controller is designed using the given requirements, the maximum torque of 3.0 kN-m, the maximum deflection angle of 25 deg. and the maximum angular velocity of 30 deg/sec. More detailed design to make more compact and highly efficient system will be done in the future.

• 대한기계학회논문집A
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• 제36권2호
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• pp.173-178
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• 2012

최근 RFID, 유연디스플레이, 태양전지, 전자 종이 등의 소자를 프린팅 방식을 이용하여 생산하려는 연구가 활발하게 진행 되고 있다. 이런 방식이 기존의 노광기술과 식각기술에 의존하는 반도체 공정에 비해 가격 경쟁력에서 우수하기 때문이다. 특히 RFID, 유연디스플레이, 태양전지, 전자 종이 등은 유연성과 대량생산을 필요로 하기 때문에 롤투롤(roll to roll)공정과 같은 저가격화, 대형생산화에 관심이 집중되고 있다. 이 롤투롤 기술을 사용하기 위해서는 인쇄 패턴의 빠른 구현, 표면 균일도, 두께 등의 높은 인쇄 품질이 보장 되어야 한다. 본 연구는 실험계획법(Design of Experiment)을 적용하여 인자들의 주효과와 교호작용 효과를 분석하고, 롤투롤 전자인쇄 시스템에서 닙 롤의 특성에 따른 인쇄 품질의 영향과 인쇄 품질의 향상 방안을 찾기 위한 매칭기술을 제안 하였다.

• 대한기계학회논문집
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• 제16권2호
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• pp.400-408
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• 1992

In this paper, analysis of temperature and stress distributions in the roll for a twin roll continuous casting process was carried out. Firstly, several state equations were set up to determine the temperature distribution in the roll using finite difference method. Secondly, thermal stress in the roll was calculated numerically. Also, stress distribution due to the roll pressure was calculated to determine the effect of the roll pressure. For analysis of temperature distributions and the stress states of the roll, there are three kinds of roll materials, 2ICrMoV5. 11, CuCo/NiBe, CuCrZr and three types of cooling system were used.

• 한국생산제조학회지
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• 제19권6호
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• pp.867-874
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• 2010

RFID printing technology has emerged recently as an important tool for leading future IT. Therefore, many manufacturers concerning on low cost and mass production of the related products pay close attention to the printing technology. In order to realize printed electronics, the technologies for fine line-width/gap printing and registration are essential work. This study proposes a precise Roll to Roll control system that is capable of tilting two posts. Two controllable tilting posts can adjust film position at traverse direction for the precision registration. A mathematical model for representing the geometric features of each posts in Roll to Roll printing system is established first. Then an operating program is built to implement the system and to control film movement. For experimental test, a hard ware system is fabricated which is consisted of two AC servo motors, two posts tilting mechanisms, several guide rolls, and so on. The test results show the proposed system can control the film position precisely at transverse direction.

• 대한임베디드공학회논문지
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• 제17권5호
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• pp.257-263
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• 2022

Active stabilizers use signals such as steering angle, yaw rate, and lateral acceleration to vary the roll stiffness of the front and rear suspension depending on the vehicle's driving conditions, and are attracting attention as RSC (Roll Stability Control) system that suppresses roll when turning and improves ride comfort when going straight. Various studies have been conducted in relation to active stabilizer bars and RSC systems. However, accurate modeling of passive stabilizer model and active stabilizer model and vehicle dynamics analysis result verification are insufficient, and performance result analysis related to vehicle roll angle estimation and electric motor control is insufficient. Therefore, in this study, an accurate vehicle dynamics model was constructed by measuring the passive/active stabilizer bar model and component parameters. Based on this, the analysis result with high reliability was derived by comparing the roll angle estimation algorithm based on the lateral acceleration and suspension of the vehicle with the actual vehicle driving test result. In addition, it was intended to accurately analyze the motor torque characteristics and roll reduction effects of the electric motor-driven RSC system.